ep series _10-80kva_ service manual
DESCRIPTION
Ep series manualTRANSCRIPT
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CONTENTS EP Series UPS operating principle ..................................................................................... 3 1 Product introduction .......................................................................................................... 4
1.1 Introduction.............................................................................................................. 4 1.2 Control panel ........................................................................................................... 4
2 System electrical connection diagram............................................................................... 5 2.1 Electrical connection schematic diagram................................................................. 5 2.2 System block diagram ............................................................................................. 6
3 EP series UPS specifications............................................................................................ 7 4 EP series UPS internal structure..................................................................................... 10
4.1 Inside picture for 10~40KVA .................................................................................. 10 4.2 Inside picture for 60-80KVA ................................................................................... 13
5 EP series UPS principle introduction .............................................................................. 16 5.1 Rectifier module..................................................................................................... 16 5.2 Inverter module...................................................................................................... 17
6 PCB interface signals...................................................................................................... 18 6.1 Rectifier driver board (CS12772E)......................................................................... 18 6.2 Rectifier control board............................................................................................ 21 6.3 Inverter driver board (CS12083F) .......................................................................... 25 6.4 Inverter control board (CS12190C)........................................................................ 27 6.5 Auxiliary power board (NF12200C)........................................................................ 31 6.6 SCR bypass board (NF12345C) ............................................................................ 34 6.7 Interface board ...................................................................................................... 36 6.8 System control board (OCSA2196A01) ................................................................. 40 6.9 Power configuration board (NF12223B) ................................................................ 46 6.10 Output sampling board (NF12310C).................................................................... 48 6.11 Inverter current sampling board (NF12494B)....................................................... 51
7 Parameter regualtion potentiometer................................................................................ 53 8 Indicator signification of PCB status................................................................................ 53
1. Indicator signification of system board status............................................................. 53 2. Indicator signification of invert control board status.................................................... 53 3. Indicator signification of parallel board status............................................................. 54
9 UPS parameter and function setting command code (press key 35 on display panel) 54 10 PCB difference between EP series different power UPS .............................................. 55
1. Rectifier driver board (CS12772E) ............................................................................. 55 2. Inverter driver board (CS12083F) .............................................................................. 55 3. Inverter current sampling board (CS12494C)............................................................. 55 4. Power configuration board (CS12223B)..................................................................... 55
EP Series UPS maintenance.............................................................................................. 57 1 Introduction ..................................................................................................................... 59
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2 Fault analysis and maintenance...................................................................................... 60 3 Failure code and inquiry.................................................................................................. 64
TABLE OF MEMORIZED INTERNAL CODE / TABELLA CODICI INTERNI ........ 64 4 Parallel maintenance ...................................................................................................... 69 5 Instructions of EP Series singe unit into parallel units:.................................................... 70 Start up ................................................................................................................................. 79
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EP Series UPS Operating Principle
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1 Product introduction 1.1 Introduction
EP series on-line intelligent UPS adopts double-conversion design to eliminate various interference of the power system. UPS outputs a pure sine wave power with stabilizing voltage, filtering out noise, low distortion and being not interferenced by the fluctuation of power system. And it has strong load ability, good load compatibility, wide range of input voltage and frequency, excellent generator compatibility, non-switching time of output and so on, extremely satisfy the requirement of various application environments; Perfect protection system improves the stability and reliability of system operation; Friendly LCD design makes human-machine communication easier; Use a RS232 between UPS and PC to get work history, monitor the parameters, start up / shut down automatically, realize unattended and remote monitoring function (by SNMP-Adapter). It applies to advanced network system. Power range: 10KVA-80KVA Operation mode: intelligent on-line (3 phases in 3 phases out) Application range: work stations, large-scale network servers, computer room and large
data center
1.2 Control panel IN utility input indicator (Green: lighting indicates normal utility, blinking indicates
abnormal utility) BY bypass output indicator (Yellow: lighting indicates normal bypass output, blinking
indicates abnormal bypass output) OUT inverter output indicator (Green: lighting indicates normal inverter output, blinking
indicates output is overload) BATT battery discharging indicator (Orange: lighting indicates the battery is discharging,
blinking indicates battery is not connected)
LCD Display
Button
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2 System electrical connection diagram 2.1 Electrical connection schematic diagram
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2.2 System block diagram
Figure 2-1 EP Series UPS electrical principle diagram
Shown on Fig 2.1, close SWBY and SWOUT, UPS checks the phase sequence. If it is correct, the bypass contactor will close immediately. Bypass powers the load (orange line) and system PCB operating power begins to set up; Then close SWIN, the rectifier begins to work, when the BUS voltage is up to 360VDC, the inverter will start up. UPS enters the self-check, if the utility is in the range of synchronous tracking and there is no internal fault, the output contactor will close and bypass contactor will open, and UPS switches to inverter mode; The battery pack is directly connected to DC BUS, once close battery switch, UPS begins to charge the battery (red line); Green line in Fig 2.1 represents maintenance bypass. When the UPS is abnormal and needs maintenance, close SWMB, the utility powers the load directly. open SWBY, SWIN, SWOUT, and discharge the voltage of capacitance to zero. Then you can change the board and carry out maintenance.
As the orange line shown on Fig 2.1, when one of the following situations happens, UPS will switch to bypass mode:
1) Utility is on, close SWBY and SWOUT, SWIN is off; 2) Close SWIN, UPS is in soft start process; 3) Switch to bypass mode through operating command on the control panel; 4) Overload; 5) Inverter fault; 6) UPS overtemperature protection.
AC DC
DCAC
SWIN
BYP SWBY
TLBY
SWOUT
TLBATT
FBATT
TLI
SWMB
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3 EP series UPS specifications
System THREE-PHASE OUTPUT Rated power [KVA] 10 15 20 30 40 60 80 Power factor range
100 % load 0.5~0.8 inductive load 100~80%load 0.8~1.0 inductive load
80% load 1.0~0.8 capacitive load 70% load 0.5~0.8 capacitive load 80%load computer load
Efficiency% Full load 90 90 91 91 92 92 92 Half load 88 88 89 89 90 91 91
Loss power with nominal load and battery charge kW / kcal / B.T.U.
0.89 800 4367
1.33 1100 4400
1.58 14005560
2.37 20007940
2.78 2400 9500
4.17 3600
14000
5.57 4800
19000Flow rate allowing (for room installation) (*)[mc/h]
496 682 868 1240 1488 2232 2976
Max leakage current [mA] 100 MTBF: 200,000 hours Remote signal three contact signals (battery low, battery discharging,
bypass/fault); output 12Vdc 80mA Computer interface RS232/C Operating temperature 0 40 C Maximum relative hunmidity 95 % (without condensate) Maximum operating altitude 1000m at rated power An (-1% An for each 100m) max 4000mCooling forced ventilation (fan speed function of the load) Acoustic noise, as measured at 1m from front of equipment (depend on load and temperature) dBA
48 ~ 54 53 ~ 60 53 ~ 62
Degree of protection IP20
Rectifier input (Standard UPS) THREE-PHASE OUTPUT Rated power [KVA] 10 15 20 30 40 60 80 Rated voltage 380V 3 phases Phase 3 Voltage range 20 % Rated frequency 50 / 60 Hz auto learning Frequency range 45 ~ 65 (1+10%) Soft start 0 - 100% 10 Sec Max input current [A] 18 28 37 55 72 108 130 Current distortion 30 % Power factor 0.8
Rectifier input (UPS with harmonic reduction filter) THREE-PHASE OUTPUT Rated power [KVA] 10 15 20 30 40 60 80 Rated voltage 380V 3 phases Phase 3
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Voltage range 20 % Rated frequency 50 / 60 Hz auto learning Frequency range 45 ~ 65 Soft start 0 ~ 100% 10 Sec Max input current [A] 16 24 33 50 65 97 117 Total harmonic distortion and power factor, vary with the output load (nominal input Voltage) :
load 100% distortion 8% p.f. 0.9 50% 12% 0.94 30% 25% 0.96 0% 30% 1
Total harmonic distortion and power factor, vary with the input voltage (load 100%) :
Vinput 100% distortion 8% p.f. 0.9 86% 5% 0.94 114% 11% 0.84
Rectifier output THREE-PHASE OUTPUT Rated power [KVA] 10 15 20 30 40 60 80 Maintenance voltage (20C) Battery type 1 and 2 : V =435Vdc (2.26 x el.)
type 3 : V =424Vdc (2.2 x el.) type 0 : default values are equal to type 1 and 2. Value adjustable V =400~460Vdc
Charge voltage Battery type 1 and 2 : V(% recharge
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Voltage phase shift, with unbalancedload (degree)
2
Distortion with non-linear load (crest factor 3:1)
8 %
Voltage stability at steady state 1 % Voltage stability at transient state 5 % into 10 ms Rated frequency The same of the input Frequency stability With synchronization 0.05 % Without synchronization 2 % (settable 1 % on the control panel) overload 110/125/150% rated current 300 sec / 10sec / 1 sec Short circuit current for 0.1 sec 2 In Inverter efficiency % load 100% 91% 91% 92% 92% 93% 93% 93%
Bypass THREE-PHASE OUTPUT Rated power [KVA] 10 15 20 30 40 60 80 Rated current (A) 14 22 29 43 58 87 115 Rated voltage 380V Number of phases 3 + N Input voltage range 15 % (settable 10 % , 15 % on the control panel) Rated frequency 50 / 60 Hz (auto learning) Input frequency range 2 % (settable 5 % on the control panel) Inverter/bypass transfer time (overload) 0 ms Inverter/bypass transfer time (inverter fault)
1 ms
Overload capacity %In 1h 1.5 1.6 1.5 1.6 1.5 1.3 1.2 10min 1.7 1.8 1.7 1.7 1.7 1.4 1.3 1min 2.4 2.5 2.4 2.5 2.4 2 1.8 1s~20ms 10 10 10 10 10 8 8 10ms 14 15 14 15 14 12 11 Standard Backfeed protection Options Harmonic reduction filter
Insulation transformer on bypass line (external cabinet) SNMP card for monitoring
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4 EP series UPS internal structure
4.1 Inside picture for 10~40KVA
Figure 4-1 Epower series UPS internal top view
System Control Board
Aux Power Board
Interface Board
SCR Bypass Board Configuration Board
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Figure 4.2 EP series UPS internal left view
Figure 4.3 EP series UPS internal right view
Phase 2 INV Driver Board
INV Control Board
Output Transformer Input Inductance
Phase 2 INV Driver Board
Output Filter Capacitance
Phase 3 INV Driver Board
Rectifier Driver Board
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Figure 4.4 EP series UPS internal front view (1)
Figure 4.5 EP series UPS internal front view (2)
Rectifier Control Board
DC CAP.
DC FUSE
IGBT Module SCR Rectifier Module
Output Vol Sampling Board
BATT FUSE
Bypass Breaker
Battery Contactor
INV Output Contactor Bypass Output Contactor
SWIN SWBY SWOUT SWMB
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4.2 Inside picture for 60-80KVA
Figure 4.6 EP series UPS internal front view
Phase 3 INV driver Phase 1 INV driver
Phase 2 INV driver
DC CAP. DC FUSE
SCR rectifier module
AC CAP.
TLI TLBY TLBATT
SWB SWIN SWBY SWOUT SWMB
Bypass fuse
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Figure 4.7 EP series UPS internal top view
Figure 4.8 EP series UPS internal right view
System Control Board Interface Board
Aux Power Board SCR Bypass Board
Inverter Control Board
Rectifier Control Board
Rectifier Driver Board
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Figure 4.9 EP series UPS internal back view
Output Transformer Input Inductance
Fans
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5 EP series UPS principle introduction
5.1 Rectifier module
Fig 5-1 shows schematic diagram of three phases rectifier circuit. Phase sequence of three phases input is RST, and triggering signal of rectifier circuit is also designed in accordance with the sequence. The valves are paired triggered, and the triggered sequence is shown as Fig 5-2:
Wave form of rectifier output voltage without filter is shown as Fig 5-3, Area of rectifying
wave form is equal to the voltage area contained by two corresponding rectifier valves.
Figure 5-3 EP series UPS three phases rectifier principle and wave form diagram
The working process is as follows:
When the utility UR crosses zero point at t0 and rises, if send a trigger pulse to Thyristor 1
at t1 behind the intersection point UR=UT, the voltage between US is the largest at this time, so
the procedure is designed to open relevant Thyristor 5, to form a loop. It can be seen from the
figure, UR continues to rise, US also rises. When the rising UR arrives at peak, it is just on t2
when the rising US intersects the falling UT. If 5 is common rectifier diode, will automatically
convert to 1 and 6 paired-on status. But here is Thyristor, If relevant Thyristor is not triggered
Figure 5-1 EP series UPS rectifier circuit
1 1 2 2 3 3 1 5 6 6 4 4 5 5
Figure 5-2 EP series UPS rectifier SCR triggered sequence
Uc Ub Ua
C
1
4 5 6
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to open, 1 and 5 will continue on till t4 (UR=US). As the arc dotted line shown in Fig 5-3. So the
trigger sequence is open Thyristor 6 on t3, make the rectifier output the maximum. This status
will last to t4, At this time UT arrives at the negative peak, it also the intersection point of UR
and US (UR=US). After this point, Thyristor 2 is triggered, to form 2 and 6 paired-on, repeat 1
and 6 paired-on status. Then open relevent valve on US and UT Arm according to the same
sequence. Make the output be DC wave in the absence of capacitance filter as shadow wave
form shown in Fig 5-3. The rectifier wave is regular and symmetrical, so three phases input
current is also symmetrical and identical.
5.2 Inverter module
Fig 5-4 shows schematic diagram of EP series UPS three phases full bridge inverter
circuit. The conversion purpose is just opposite to three phases full bridge rectifier circuit, to
realize DC/AC conversion by controlling Q1-Q6 on by turns. Then output pure sine wave
voltage through boost transformer and LC filter.
Figure 5-4 EP series UPS inverter principle diagram
Q1 Q2 Q3
Q4 Q5 Q6
T1
+BUS
-BUS
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6 PCB interface signals
6.1 Rectifier driver board (CS12772E)
PICTURE OF CS12772E
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CS12772E PCB Function of each pin and signal instruction
CS12772EJ1 (input voltage/current detect, TO J1 of rectifier control board)
Pin No. Descriptions Pin1 VF1APhase1 input voltage sampling signal Pin2 VF1BPhase1 input voltage sampling signal Pin3 VF2APhase2 input voltage sampling signal Pin4 VF2BPhase2 input voltage sampling signal Pin5 VF3APhase3 input voltage sampling signal Pin6 VF3BPhase3 input voltage sampling signal Pin7 IF1A Phase1 input current sampling signal Pin8 IF1B Phase1 input current sampling signal Pin9 IF2A Phase2 input current sampling signal Pin10 IF2B Phase2 input current sampling signal Pin11 IF3A Phase3 input current sampling signal Pin12 IF3B Phase3 input current sampling signal CS12772EJ2 (rectifier driver pulse generator, To J2 of rectifier control board)
Pin No. Descriptions Pin1 +24VDC
Pin2 Phase R driver (SCR1)
Pin3 Phase R driver (SCR4)
Pin4 Phase S driver (SCR2)
Pin5 Phase S driver (SCR5)
Pin6 Phase T driver (SCR3)
Pin7 Phase T driver (SCR6)
Pin8 connect to Pin1 of J3
Pin9
Pin10 short Pin9 and Pin10, connect to Pin2 of J3
CS12772EJ3 (rectifier temperature detection)
Pin No. Descriptions Pin1 probe of temperature control (typical
value:11.5K)
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Pin2 probe of temperature control
CS12772EJ4 (rectifier voltage and battery charging/discharging current detection, To J3 of rectifier control board)
Pin No. Descriptions Pin1 Urec-
Pin2 Urec+
Pin3 IBatt+ (connect to current sampling resistance RB)
Pin4 IBatt- (connect to current sampling resistance RB)
Pin5 Cable (short with Pin4)
Pin6 GND
CS12772EJ5 (three phases input voltage sampling point) Pin No. Descriptions Pin1 Phase 1 (rated value:230AC)
Pin2 Phase 2
Pin3 Phase 3
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6.2 Rectifier control board
PICTURE OF CS12742E
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CS12742E PCB Function of each pin and signal instruction CS12742EJ1 (input voltage/current detection signal, TO J1 of rectifier driver board)
Pin No. Descriptions Pin1 VF1APhase 1 input voltage sampling signal Pin2 VF1BPhase 1 input voltage sampling signal Pin3 VF2APhase 2 input voltage sampling signal Pin4 VF2BPhase 2 input voltage sampling signal Pin5 VF3APhase 3 input voltage sampling signal Pin6 VF3BPhase 3 input voltage sampling signal Pin7 IF1A Phase 1 input current sampling signal Pin8 IF1B Phase 1 input current sampling signal Pin9 IF2A Phase 2 input current sampling signal Pin10 IF2B Phase 2 input current sampling signal Pin11 IF3A Phase 3 input current sampling signal Pin12 IF3B Phase 3 input current sampling signal CS12742EJ2 (rectifier SCR driver pulse generating circuit, To J2 of rectifier dirver board)
Pin No. Descriptions Pin1 +24VDC
Pin2 Phase R driver (SCR1)
Pin3 Phase R driver (SCR4)
Pin4 Phase S driver (SCR2)
Pin5 Phase S driver (SCR5)
Pin6 Phase T driver (SCR3)
Pin7 Phase T driver (SCR6)
Pin8 Thermal 2
Pin9 GND
Pin10 Cable1
CS12742EJ3 (TO J4 of rectifier drive board)
Pin No. Descriptions Pin1 Urec-
Pin2 Urec+
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Pin3 TAB+
Pin4 TAB-
Pin5 Cable
Pin6 GND
CS12742EJ4 (Null) Pin No. Descriptions Pin1 SETIB
Pin2 SETV
Pin3 VC
Pin4 VP
Pin5 VN
Pin6 GND
Pin7 0V (+24VDC negative port)
Pin8 +24VDC
CS12742EJ5 (operating power, control signal and feedback signal of rectifier, TO J4 of system control board)
Pin No. Descriptions Pin1 IR3 (Phase 3 current detection signal of rectifier input)
Pin2 VAVG3 (Phase 3 input average voltage)
Pin3 IR2 (Phase 2 current detection signal of rectifier input)
Pin4 VAVG2 (Phase 2 input average voltage)
Pin5 IR1 (Phase 1 current detection signal of rectifier input )
Pin6 VAVG1 (Phase 1 input average voltage)
Pin7 synchrotrans signal
Pin8 charging current setting
Pin9
Pin10 charging voltage setting
Pin11 rectifier start up enable signal (from system control board)
Pin12 battery discharging current sampling signal
Pin13 battery charging current sampling signal
Pin14 battery voltage sampling signal
Pin15 overtemperature alarm signal
Pin16 GND
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Pin17 +24VDC
Pin18 +24VDC
Pin19 +12VDC
Pin20 +12VDC
Pin21 0V (+24VDC negative port)
Pin22 0V (+24VDC)
Pin23 GND
Pin24 GND
Pin25 GND
Pin26 -12VDC
Pin27 -12VDC
Pin28 null
Pin29 null
Pin30 connect to one NTC of transformer through J6, detect the temperature of
transformer
Pin31
Pin32 rectifier disabling signal
Pin33
Pin34 GND
CS12742EJ6 (access point of transformer temperature detect signal) Pin No. Descriptions Pin1 null
Pin2 null
Pin3 connect to one NTC of transformer, detect the
temperature of transformer
Pin4 GND
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6.3 Inverter driver board (CS12083F)
PICTURE OF CS12083F
CS12083F PCB Function of each pin and signal instruction CS12083F J1 (inverter driver signal, TO J1 or J2 or J3 of inverter control board)
Pin No. Descriptions Pin1 probe of temperature control (PTC)
Pin2 GND
Pin3 driver power
Pin4 driver power
Pin5 upper arm driver signal feedback optocoupler biasing power(collector)
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Pin6 upper arm driver signal feedback optocoupler biasing power(emitter)
Pin7 lower arm driver signal feedback optocoupler biasing power(collector)
Pin8 lower arm driver signal feedback optocoupler biasing power(emitter)
Pin9
Pin10 short Pin9 and Pin10
Pin11 PWMUP
Pin12 PWMUP
Pin13 null
Pin14 null
Pin15 PWMDOWN
Pin16 PWMDOWN
CS12083FJ2 (inverter radiator temperature detection) Pin No. Descriptions Pin1 probe of temperature control (PTC)
Pin2 GND
CS12083FJ3 (driver terminal, TO IGBT) Pin No. Descriptions Pin1 upper arm driver (G1:10~40KVA)
Pin2 E1
Pin3 upper arm driver (G1:60~80KVA)
Pin4 vacant
Pin5 vacant
Pin6 lower arm driver (G2:10~40KVA)
Pin7 E2
Pin8 lower arm driver (G2:60~80KVA)
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6.4 Inverter control board (CS12190C)
PICTURE OF CS12190C
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CS12190C PCB Function of each pin and signal instruction CS12190C J1, J2, J3 (R, S, T driver terminal)
Pin No. Descriptions Pin1 probe of temperature control (PTC) Pin2 GNDA Pin3 driver power Pin4 driver power Pin5 upper arm driver signal feedback optocoupler biasing power
(collector) Pin6 Pin7 short Pin6 and Pin7
Pin8 lower arm driver signal feedback optocoupler biasing power(emitter)
Pin9 Pin10 short Pin9 and Pin10, Link signal (connect to GND)
Pin11 PWMUP Pin12 PWMUP Pin13 null Pin14 null Pin15 PWMDOWN Pin16 PWMDOWN
CS12190CJ4 (TO CS12494C: inverter current sampling board)
Pin No. Descriptions Pin1 R phase inverter current sampling signal (Ipeak)
Pin2 S phase inverter current sampling signal (Ipeak)
Pin3 T phase inverter current sampling signal (Ipeak)
Pin4 Neutral line current
Pin5 +12VDC
Pin6 -12VDC
Pin7 Link (connection detection signal)
Pin8 Link
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CS12190CJ5 (TO NF12310C: J1 of output sampling board) Pin No. Descriptions Pin1 VR (Phase R inverter output voltage
detection) Pin2 VN
Pin3 null
Pin4 VS
Pin5 VN
Pin6 null
Pin7 VT
Pin8 VN
Pin9 null
Pin10 Link
Pin11 Link
Pin12 Link NGND CS12190CJ6 (BUS voltage detection)
Pin No. Descriptions Pin1 Vbatt- (-BUS voltage detection signal)
Pin2 Vbatt+ (+BUS voltage detection signal)
Pin3 LinkLowNormal HighFailure Pin4 Link
CS12190C: J7 (operating power and control signal of inverter, TO J3 of system control board)
Pin No. Descriptions Pin1 +13.5VDC
Pin2 +13.5VDC loop (0V reference)
Pin3 +13.5VDC
Pin4 +13.5VDC loop
Pin5 +13.5VDC
Pin6 +13.5VDC loop
Pin7 +13.5VDC
Pin8 +13.5VDC loop
Pin9 +12VDC
Pin10 -12VDC
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Pin11 +12VDC
Pin12 -12VDC
Pin13 null
Pin14 -12VDC loop
Pin15 inverter synchronous signal
Pin16 12VDC common port
Pin17 clock signal
Pin18 12VDC common port
Pin19 data signal
Pin20 common port
Pin21 SCR-DC-INV-FAIL
Pin22 inverter gating port (high level on)
Pin23 inverter OK signal (feedback to system board)
Pin24 synchronization OK signal (feedback to system board)
Pin25 NTC1 (orignal design has the NTC, vacant in fact)
Pin26 NTC2
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6.5 Auxiliary power board (NF12200C)
PICTURE OF CS12200C
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NF12200C PCB Function of each pin and signal instruction
NF12200CJ1 (two power inputs, one main one auxiliary) Pin No. Descriptions Pin1 output voltage - live wire (220VAC, from Phase R of inverter contactor
output)
Pin2 null
Pin3 bypass input voltage - live wire (220VAC, from Phase R of SWBY output)
Pin4 output voltage neutral wire
Pin5 null
Pin6 bypass input voltage - neutral wire
NF12200CJ2 (operating power of complete machine, To J2 of system control board) Pin No. Descriptions Pin1 +24VDC (PFC: rectifier operating power)
Pin2 +24VDCPFC Pin3 +24VDC loop
Pin4 +24VDC loop
rated output power
15W
Pin5 +12VDCPFC Pin6 +12VDCPFC
3W
Pin7 12VDC loop
Pin8 12VDC loop
Pin9 -12VDCPFC Pin10 -12VDCPFC
3W
Pin11 +13.5VDC (VPOT: inverter operation power)
Pin12 +13.5VDCVPOT Pin13 +13.5VDCVPOT Pin14 +13.5VDCVPOT Pin15 +13.5VDCVPOTloop Pin16 +13.5VDCVPOTloop Pin17 +13.5VDCVPOTloop Pin18 +13.5VDCVPOTloop
15W
Pin19 +12VDC (INV: inverter operating power) 4W
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Pin20 +12VDCINV Pin21 12VDC loop
Pin22 12VDC loop
Pin23 -12VDCINV 0.3W Pin24 +12VDC (SYS: system operating power)
Pin25 +12VDCSYS 5W
Pin26 +12VDC loop
Pin27 +12VDC loop
Pin28 +12VDC (SYSPOT: system operating power)
Pin29 +12VDCSYSPOT 3W
Pin30 -12VDCSYS 150mW Pin31/32/33 null
Pin34 auxiliary power PCB operating forbidden signal
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6.6 SCR bypass board (NF12345C)
PICTURE OF NF12345C
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NF12345C PCB Function of each pin and signal instruction
NF12345CJ1 (bypass SCR driver pulse source port, TO J3 of interface board) Pin No. Descriptions Pin1 GNDA
Pin2 SCR driver pulse (the third quadrant)
Pin3 SCR driver pulse (the first quadrant)
Pin4 SCR current detection signal
NF12345CJ2 (bypass input/output voltage detect, TO J6 of interface board) Pin No. Descriptions Pin1 null Pin2 neutral wire of fan power Pin3 neutral wire of three phases output Pin4 Phase T output sampling signal Pin5 Phase S output sampling signal Pin6 Phase R output sampling signal Pin7 bypass Phase T input sampling signal Pin8 bypass Phase S input sampling signal Pin9 bypass Phase R input sampling signal Pin10 TLI, TLBATT winding power (from Phase 1 of output, convert to 220VDC by
AC/DC) Pin11 TLBY winding power (from Phase 1 of bypass, convert to 220VDC by AC/DC)Pin12 Phase R output to tripper winding of SWBY
NF12345CJ3 (TO J1 of auxiliary power board) Pin No. Descriptions Pin1 inverter output voltage - live wire (220VAC, from inverter contactor output
Phase R) Pin2 null Pin3 bypass input voltage - live wire (220VAC, from SWBY output Phase R) Pin4 inverter output voltage neutral wire Pin5 null Pin6 bypass input voltage neutral wire
NF12345CJ4 (fan power, TO 220AC) Pin1/2/3/4/5/6 live wirePin7/8/9/10/11/12 neutral wire
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6.7 Interface board
PICTURE OF NF12197B
NF12197B PCB Function of each pin and signal instruction
NF12197BJ1 (operating power and control signal of dry contact, TO J9 of system control board)
Pin No. Descriptions Pin1 +12VDC (optocoupler biasing power source)
Pin2 +12VDC (negative port of optocoupler biasing power source)
Pin3 close inverter command (dry contact remote control signal)
Pin4 shut down UPS command (dry contact remote control signal)
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NF12197BJ2 (contactor control signal and bypass SCR driver pulse, TO J8 of system control board) Pin No. Descriptions
Pin1 control RL4 to make TLBATT winding power on. Low: normal High: abnormal
Pin2 control RL5 to make inverter output contactor TLI winding power on, turn offTLBY at the same time. Low: inverter High: bypass Pin3 SWBY tripper action signal (provided by system control board) Pin4 Pin5 Pin6 bypass SCR driver pulse string
Pin7 battery contactor TLBATT auxiliary contact signal Pin8 bypass contactor TLBY auxiliary contact signal Pin9 inverter contactor TLI auxiliary contact signal Pin10 SWOUT auxiliary contact Pin11 SWMB auxiliary contact Pin12 COM. (common port) Pin13 GND Pin14 Phase R inverter output current sampling signal (Ipeak) Pin15 Phase S inverter output current sampling signal (Ipeak) Pin16 Phase T inverter output current sampling signal (Ipeak) Pin17 +12VDC Pin18 +12VDC Pin19 +12VDC (inverter part) Pin20 common port Pin21 common port Pin22 bypass SCR current sampling signal Pin23 null Pin24 bypass Phase R input voltage sampling (positive half-wave, voltage value
20VAC) Pin25 bypass Phase R input voltage sampling (negative half-wave, voltage value
20VAC) Pin26 bypass Phase S input voltage sampling (positive half-wave, voltage value
20VAC) Pin27 bypass Phase S input voltage sampling (negative half-wave, voltage value
20VAC) Pin28 bypass Phase T input voltage sampling (positive half-wave, voltage value
20VAC) Pin29 bypass Phase T input voltage sampling (negative half-wave, voltage value
20VAC) Pin30 Phase R output voltage sampling (positive half-wave, voltage value 20VAC) Pin31 Phase R output voltage sampling (negative half-wave, voltage value 20VAC)
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Pin32 Phase S output voltage sampling (positive half-wave, voltage value 20VAC) Pin33 Phase S output voltage sampling (negative half-wave, voltage value 20VAC) Pin34 Phase T output voltage sampling (positive half-wave, voltage value 20VAC) Pin35 Phase T output voltage sampling (negative half-wave, voltage value 20VAC) Pin36 null Pin37 null Pin38 battery discharging alarm signal (dry contact alarm) Pin39 battery discharging off alarm signal (dry contact alarm) Pin40 bypass abnormal alarm signal (dry contact alarm)
NF12197BJ3 (TO J1 of bypass SCR board) Pin No. Descriptions Pin1 GND
Pin2
Pin3 SCR driver pulse string
Pin4 SCR current detection signal (TASCR)
NF12197BJ4 Instruction: connect to remote control output port, controlled by RL1, RL2 and RL3, output dry contact alarm signal to realize remote control function. Detailed interface desription refers to instruction NF12197BJ5 (TO auxiliary contacts of the three contactors) Pin No. Descriptions Pin1 bypass contactor auxiliary contact (AuxTLBY)
Pin2 battery contactor auxiliary contact (AuxBATT)
Pin3 COM. (common port)
Pin4 inverter contactor auxiliary contact (AuxTLI)
NF12197BJ6 (TO J2 of bypass SCR board) Pin No. Descriptions Pin1 null Pin2 neutral wire of fan power Pin3 three phases output neutral wire
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Pin4 Phase T output sampling signal Pin5 Phase S output sampling signal Pin6 Phase T output sampling signal Pin7 bypass Phase T input sampling signal Pin8 bypass Phase S input sampling signal Pin9 bypass Phase R input sampling signal Pin10 TLI, TLBATT winding power (from output of Phase 1, convert to 220VDC by
AC/DC) Pin11 TLBY winding power (from Phase 1 of bypass, convert to 220VDC by AC/DC)Pin12 Phase R output to tripper winding of SWBY
NF12197BJ7 (connect to contactor winding and inverter output current detection loop) Pin No. Descriptions Pin1 NSYS Pin2 COMTA3 Pin3 anode of bypass contactor winding power Pin4 anode of battery contactor winding power Pin5 anode of inverter output contactor winding power (+220VDC) Pin6 cathode of battery and inverter output contactor winding
operating power(sharing) Pin7 cathode of byapss contactor winding operating power Pin8 COMTA2 Pin9 TAOUT3 (Phase T output current, AC) Pin10 TAOUT2 (Phase S current) Pin11 TAOUT1 (Phase R current) Pin12 COMTA1
NF12197BJ8 (connect to auxiliary contactor of input/output switch and maintenance bypass switch)
Pin No. Descriptions Pin1 connect to NC of SWMB
Pin2 COM.
Pin3 connect to NO of SWOUT
Pin4 null
Pin5 null
Pin6 null
Pin7 N
Pin8 L (SWBY tripper winding operating power, controlled by RL6, 220AC)
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6.8 System control board (OCSA2196A01)
PICTURE OF OCSA2196A01
OCSA2196A01 PCB Function of each pin and signal instruction OCSA2196A01J1 (TO LCD and LED indicator display panel) Pin No. Descriptions Pin1 +12VDC (provide operating power to LCD and buzzer )
Pin2 TASTCOL2
Pin3 LCDINV (inverter output indicator lightening signal)
Pin4 LCDBY (bypass output indicator lightening signal)
Pin5 RWLCD (contrast regulation)
Pin6 D0LCD
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Pin7 D2LCD
Pin8 TASTCOL1
Pin9 LEDLINE (utility input indicator signal)
Pin10 LEDBATT (battery indicator signal)
Pin11 buzzer
Pin12 -5VDC (LCD CMOS chip power)
Pin13 VSSGND Pin14 +12VDC (provide operating power to LCD and buzzer )
Pin15 +5VDC (VDD: LCD CMOS chip power)
Pin16 LCD connection is OK
Pin17 RSLCD (reset signal)
Pin18 ENLCD (gating first, high level on)
Pin19 D1LCD
Pin20 D3LCD
Pin21 TASTCOL2
Pin22 LCDINV (inverter output indicator signal)
Pin23 bypass indicator signal
Pin24 null
Pin25 null
Pin26 VSSGND
OCSA2196A01J2 (TO J2 of auxiliary power board) Pin No. Descriptions Pin1 +24VDC (PFC: rectifier operating power)
Pin2 +24VDCPFC Pin3 +24VDC common port
Pin4 +24VDC common port
rated output power
15W
Pin5 +12VDCPFC Pin6 +12VDCPFC
3W
Pin7 12VDC common port
Pin8 12VDC common port
Pin9 -12VDCPFC Pin10 -12VDCPFC
3W
Pin11 +13.5VDC (VPOT: inverter operation power)
Pin12 +13.5VDCVPOT 15W
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Pin13 +13.5VDCVPOT Pin14 +13.5VDCVPOT Pin15 +13.5VDC (VPOT)common port
Pin16 +13.5VDC (VPOT)common port
Pin17 +13.5VDC (VPOT)common port
Pin18 +13.5VDC (VPOT)common port
Pin19 +12VDC (INV: inverter operating power)
Pin20 +12VDCINV 4W
Pin21 12VDC common port
Pin22 12VDC common port
Pin23 -12VDCINV 0.3W Pin24 +12VDC (SYS: system operating power)
Pin25 +12VDCSYS 5W
Pin26 +12VDC common port
Pin27 common port
Pin28 +12VDC (SYSPOT: system operating power)
Pin29 +12VDCSYSPOT 3W
Pin30 -12VDCSYS 150mW Pin31/32/33 null
Pin34 auxiliary power PCB operating forbid signal
OCSA2196A01J3 (TO J7 of inverter control board) Pin No. Descriptions Pin1 +13.5VDC
Pin2 common port
Pin3 +13.5VDC
Pin4 common port
Pin5 +13.5VDC
Pin6 common port
Pin7 +13.5VDC
Pin8 common port
Pin9 +12VDC
Pin10 -12VDC
Pin11 +12VDC
Pin12 -12VDC
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Pin13 null
Pin14 GND
Pin15 inverter synchronous signal
Pin16 12VDC common port
Pin17 clock signal
Pin18 12VDC common port
Pin19 data signal
Pin20 GND
Pin21 SCR-DC-INV-FAIL
Pin22 inverter gating port (high level on)
Pin23 inverter OK signal (feedback to system board)
Pin24 synchronization OK signal (feedback to system board)
Pin25 NTC1 (orignal design has the NTC, vacant in fact)
Pin26 NTC2
OCSA2196A01J4 (TO J5 of rectifier control board) Pin No. Descriptions Pin1 IR3 (Phase 3 of rectifier input current detection signal)
Pin2 VAVG3 (Phase 3 input average voltage )
Pin3 IR2 (Phase 2 of rectifier input current detection signal)
Pin4 VAVG2 (Phase 2 input average voltage )
Pin5 IR1 (Phase 1 of rectifier input current detection signal)
Pin6 VAVG1 (Phase1 input average voltage )
Pin7 synchrotrans signal
Pin8 charging current setting
Pin9
Pin10 charging voltage setting
Pin11 rectifier starp up enable signal (from system control board)
Pin12 battery discharging current sampling signal
Pin13 battery charging current sampling signal
Pin14 battery voltage sampling signal
Pin15 overtemperature alarm signal
Pin16 GND
Pin17 +24VDC
Pin18 +24VDC
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Pin19 +12VDC
Pin20 +12VDC
Pin21 +24VDC negative port
Pin22 +24VDC negative port
Pin23 GND
Pin24 GND
Pin25 GND
Pin26 -12VDC
Pin27 -12VDC
Pin28 null
Pin29 null
Pin30 connect to one NTC of transformer through J6, detect the
temperature of transformer
Pin31
Pin32 rectifier disabling signal
Pin33
Pin34 GND
OCSA2196A01J5 (TO J1 of power configuration board) Pin No. Descriptions Pin1 GND (analogy GND)
Pin2 TAOUT2 (Phase S output current detection signal)
Pin3 TAOUT3 (Phase T output current detection signal)
Pin4 \Low (digital signal) Pin5 \60Hz (when input and output is 60Hz, short block on JP2-2 of
configuration board is connected) Pin6 spare (idle)
Pin7 spare (idle)
Pin8 spare (idle)
Pin9 GND (analogy GND)
Pin10 TAOUT1 (Phase R output current detection signal)
Pin11 TADC
Pin12 TAAC
Pin13 spare (idle)
Pin14 GND (digital GND)
Pin15 GND (digital GND)
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OCSA2196A01J6 (idle)
OCSA2196A01J7 (RS232 interface) omit OCSA2196A01J8 (TO J2 of interface board) Pin No. Descriptions
Pin1 control RL4 to make TLBATT winding power on Low: normal High: abnormal
Pin2 control RL5 to make inverter output contactor TLI winding power on, turn off TLBY at the same time. Low: invert High: bypass Pin3 SWBY tripper action signal (provided by system board) Pin4 Pin5 Pin6 bypass SCR driver pulse string
Pin7 battery contactor TLBATT auxiliary contact Pin8 bypass contactor TLBY auxiliary contact Pin9 inverter contactor TLI auxiliary contact
Pin10 SWOUT auxiliary contact Pin11 SWMB auxiliary contact Pin12 COM. (common port) Pin13 signal GND (GND) Pin14 Phase R inverter output current sampling signal (Ipeak) Pin15 Phase S inverter output current sampling signal (Ipeak) Pin16 Phase T inverter output current sampling signal (Ipeak) Pin17 +12VDC Pin18 +12VDC Pin19 +12VDC (inverter part) Pin20 common port Pin21 common port Pin22 bypass SCR current sampling signal Pin23 null Pin24 bypass Phase R input voltage sampling (positive half-wave voltage value
20VAC) Pin25 bypass Phase R input voltage sampling (negative half-wave voltage value
20VAC) Pin26 bypass Phase S input voltage sampling (positive half-wave voltage value
20VAC) Pin27 bypass Phase S input voltage sampling (negative half-wave voltage value
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20VAC) Pin28 bypass Phase T input voltage sampling (positive half-wave voltage value
20VAC) Pin29 bypass Phase T input voltage sampling (negative half-wave voltage value
20VAC) Pin30 Phase R output voltage sampling (positive half-wave, voltage value 20VAC) Pin31 Phase R output voltage sampling (negative half-wave, voltage value 20VAC) Pin32 Phase S output voltage sampling (positive half-wave, voltage value 20VAC) Pin33 Phase S output voltage sampling (negative half-wave, voltage value 20VAC) Pin34 Phase T output voltage sampling (positive half-wave, voltage value 20VAC) Pin35 Phase T output voltage sampling (negative half-wave, voltage value 20VAC) Pin36 null Pin37 null Pin38 battery discharging alarm signal (dry contact alarm) Pin39 battery discharging off alarm signal (dry contact alarm) Pin40 bypass abnormal alarm signal (dry contact alarm)
6.9 Power configuration board (NF12223B)
PICTURE OF NF12223B
NF12223B PCB Function of each pin and signal instruction (omit)
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Diagram of NF12223B
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6.10 Output sampling board (NF12310C)
PICTURE OF NF12310C
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Diagram of NF12310C
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NF12310C PCB Function of each pin and signal instruction
NF12310CJ1 (inverter output voltage sampling, TO J5 of inverter control board) Pin No. Descriptions Pin1 VR (Phase R inverter output voltage sampling) Pin2 VN Pin3 null Pin4 VS Pin5 VN Pin6 null Pin7 VT Pin8 VN Pin9 null Pin10 Link (interface connection OK or not signal) Pin11 Link Pin12 Link NGND
NF12310CJ2 (output current feedback, TO J7 of interface board) Pin No. Descriptions Pin1 TAOUT1 (Phase R current) Pin2 TAOUT2 (Phase S current) Pin3 COM1 Pin4 TAOUT3 (Phase T output current, AC) Pin5 COM3 Pin6 COM2
NF12310CJ3 (inverter output voltage feedback, output to inverter control board from J1) Pin No. Descriptions Pin1 VR (Phase R inverter output voltage feedback signal) Pin3 VS Pin5 VT Pin2/Pin4/Pin6 /Pin7/Pin8 null
Pin9 neutral wire Pin10/Pin11 Link (detection signal), two pins is shorted
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6.11 Inverter current sampling board (NF12494B)
PICTURE OF NF12494B
Diagram OF NF12494B
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NF12494B PCB Function of each pin and signal instruction
NF12494B J1 (inverter current detection signal) Pin No. Descriptions Pin1 High current (high current signal) Pin2 Reture (loop common port) Pin3 Link (interface connection signal) Pin4 Low current (low current signal) Pin5 Return Pin6 Link
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7 Parameter regualtion potentiometer
PCB name Potentiometer
No. Function test point
system
control board R17
regulate base electrical
level of U4
reference value: 4.6VDC
anode of D69GNDA
system
control board R125 regulate contrast of display
inverter
control board R89
regulate base electrical
level of U26
reference value: 4.6VDC
anode of D17GNDA
rectifier
control board R157
regulate base electrical
level: 4.4VDC
anode of C86GNDA (J4-6)
8 Indicator signification of PCB status
1. Indicator signification of system board status
LED No. lightening
(green) off blinking (green) remark
L0 rectifier operating rectifier forbid
L1 inverter operating inverter forbid
L2 bypass output inverter output
L3 system abnormal system normal
2. Indicator signification of invert control board status
LED No. lightening
(green) off blinking (green) remark
L0 inverter OK inverter abnormal
L1 synchronization out of
synchronization
L2 inverter forbid inverter
operating
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3. Indicator signification of parallel board status
LED No. lightening
(green) off
slow blinking (green)
fast blinking (green)
L0 master slave
L1 bypass status communication
normal
L2 bypass operating inverter operating
9 UPS parameter and function setting command code (press key 35 on display panel)
Code Function description remark 436215 parameter setting password
436213 shield or non-shield inverter-to-bypass command (47263) display
436555 bypass permitted / forbidden functionconversion code
323232 battery self-check permitted /forbidden function conversion code
when self-check is forbidden, LCD top left corner of page 1 displays O=02
263574 clear history records the panel diaplays Memory Changed 525252 UPS type conversion Riello brand
467123 parallel units share battery pack or not function conversion code when share battery pack, LCD displays RTXX, B
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10 PCB difference between EP series different power UPS
Entire series is in common use board: system control board, inverter control board, rectifier control board, auxiliary power board,
bypass SCR board, interface board, output sampling board, parallel board
Entire series is not in common use board and the difference between them
1. Rectifier driver board (CS12772E)
Power RA1~RA3 RB R25~R26 R27~R28
10K 120 /0.5W NC 356K /1/4W 356K /1/4W
15K 82 /0.5W NC 356K /1/4W 356K /1/4W
20K 68 /0.5W 22 /0.5W 356K /1/4W 356K /1/4W
30K 47 /0.5W 22 /0.5W 356K /1/4W 356K /1/4W
40K 33 /0.5W 8.2 /0.5W 356K /1/4W 356K /1/4W
60K 22 /0.5W 8.2 /0.5W 356K /1/4W 356K /1/4W
80K 18 /0.5W 8.2 /0.5W 356K /1/4W 356K /1/4W
2. Inverter driver board (CS12083F)
Power R61R67 R65R68 R62R66 R86R88 C44 20-40K 6.8 /0.5W 10 /0.5W 12 /0.25W NC NC
60-80K 4.7 /1W 2.7 /1W 12 /0.25W1 / 5W
(noninductive)
0.015u/1600V (noninductive)
3. Inverter current sampling board (CS12494C)
Power R1,R2 R4 R3
10K 22 /0.5W 68 /0.5W 33 /0.5W
20-30K 12 /0.5W 15 /0.5W 82 /0.5W
40K 12 /0.5W 15 /0.5W 33 /0.5W
60-80K 3.3 /0.5W 10 /0.5W 10 /0.5W
4. Power configuration board (CS12223B)
Power R3R5R7 R4R6R8 =40K 47 /0.5W 22 /0.5W
Model Configurationpower configuration board
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JP1 JP2 JP3 JP4 RT10 RT15 JP4-2 RT20 JP1-1 JP3-1JP3-2 JP4-1 RT30 JP1-1 JP3-1JP3-2 JP4-1JP4-2 RT40 JP1-1 JP2-1 JP3-1JP3-2 RT60 JP1-1 JP2-1 JP3-1JP3-2 JP4-2 RT80 JP1-1 JP2-1 JP3-1JP3-2 JP4-1
(JP1/JP2/JP3/JP4 have 4 ground points, configure UPS power model according to short combination of jumper terminal)
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EP Series UPS maintenance
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Important hint 1. Before carry out maintenance to UPS, please read this manual carefully. 2. Considering the security, please dont carry out the test that is not mentioned in this manual to UPS.
Warning (only for maintenance service engineers) 1. Before maintenance, please confirm the utility is normal or not; 2. When UPS is operating, there is high voltage endangering personal safety inside UPS, please dont touch inner wiring and components casually. 3. Before unpacking the cover of connecting terminal, because there is AC utility, the inner still exists high voltage though the battery switch is off. 4. After powering off the UPS, the inner electrolysis capacitance still exists high direct voltage, please wait at least 10 minutes and then carry out the next operation.
Attentions 1. Before maintanance, check the appearance of the machine carefully, to confirm whether it
has broken down, is waterlogged and exists other man-made failures, or suffers other failures
caused by natural disasters, or it is just caused by poor electric performance.
2. Before maintenance, inquire the customer carefully about the used time, load, using
environment, electric power situation of the area and details of the broken machine. If the
customer reports as jump-spark, smoking, air switch tripping when start up the UPS, should
not start up to check it again, to avoid enlarging the range of trouble.
3. Communicate with the customer about the checking result after starting up and the
damage conditions of the component, to confirm the damage duty of the machine.
4. Check carefully to know the component is damaged obviously or not, such as capacitance
burst, IGBT burst, power resistance burnt out and so on. Confirm the connecting wires
between PCB is right or not.
5. If need to change the board, please confirm the direct BUS voltage of eletrolysis
capacotance is discharged to zero.
6. Shake the connecting cable wire, check whether it is loose or not, if loose, please fasten
the screw of connecting terminal.
7. After maintenance, it should be checked and accepted by customer, and keep customer
service records
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1 Introduction 1. maintenance man requirements On-line UPS generally provides regulation method of input / output specification, to improve reliability of the system. The locale debugging must be operated by skilled engineer who is trained and has relevant experience. Battery is periodic loss goods, general life length is about 3~5 years. So it is proposed to replace the battery once every 3 years. If you wont use the battery for a long time, charge the battery once every 2~3 months to supplement self-discharge. 2 maintenance tools required 1. Digital multimeter; 2. Oscillogragh: dual channel, 60MHz and probe pen (2PCS) with 10:1 attenuation function; 3. Digital current tester; 4. Screwdriver: - form and + form (cruciform); 5. Isolation transformer: if the oscillogragh probe pen has isolation function, it can be omitted; 6. Nipper pliers, wire cutter; 7. Load for battery discharge test (generally use incandescent bulb); 8. Cement resistance or 100W incandescent bulb that used for BUS electrolysis capacitance discharging;
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2 Fault analysis and maintenance EP series UPS fault maintenance has some specificity, especially EP series UPS fault code inquiring method, make the maintenance more clearly oriented. Combine the fault code inquiring and LED, LCD displayed on the panel, can basically confirm UPS failure part. Failure phenomena of EP series UPS are very different, might not enumerate one by one. The followings are only experience summarized in locale maintenance. They are mainly the case analyses.
Internal Fault 1
This fault usually happens when change the system board, because forget to insert the power configuretion board (NF12223). Once close the SWBY, fault code will be displayed on LCD. Some faulty phenomena relevant to power configuration board are illustrated below: Problem: install one EP30KVA new UPS unit, find the LCD displays RT15, why? Because power display signal is from power configuration board. If it is not connected to system board, will influence the display. If power configuretion board is not inserted on the system board, what will happen? Phenomena: The machine gets power, after the panel displays normally, you can see Internal fault 1. It is usually because the power configuration board is not inserted or loose. Insert the configuration board or plug it again.
Internal Fault 2
Inverter fault The machine works on bypass mode, LCD displays Internal fault 2 i=XXXX XX This information is inverter fault. When carry out maintenance, close SWMB manual maintenance switch, open SWIN/SWBY/SWOUT, discharge the capacitance.Then check and measure as the folllowing steps: a. Close SWBY once again, check D13 / D29 of each inverter driver board, blink or not. b. Measure the fuse F1 / F2 on each inverter driver board, burn out or not. c. Measure IGBT driver terminal, break down or not. d. Measure three phases inverter output fuses, burn out or not. e. Check connection of output AC capacitance, loosen or not, burn out or not. f. Check relavant connection of inverter part, loosen or not. g. Change inverter control board.
Cases:
1) EP 80KVA Loud noise of UPS, especially noise of fan, it switches to bypass mode now, LCD displays Internal fault 2, i=0201 08, where is the fault? Go to the locale, close SWMB, restart up UPS, after self-checking, it shows internal fault 2, i=0201 08. After discharging, check and find fuse F1 of Phase 3 driver board, it has burnt out.
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Change the fuse and fan, restart up, UPS operates normally. 2) EP 30 KVA UPS bypass mode, buzzer sounds long, LCD displays Internal fault 2, i=0403 08 Mainly check and measure inverter part as the above steps, corresponding fault information of 0403 clews: lockup by card or module IGBT 2 in inverter. Measure by multimeter, find connecting wire of Phase 2 output filter capacitance has broken. After changing it, restart up, UPS operates normally. Its caused by poor contact of connecting terminal. 3) EP 40 KVA One 20KVA UPS unit reports Internal fault 2, i=8001 0A, the reason? Corresponding fault code clews: lockup by card or module IGBT 3 in inverter. First mainly check the the fuse and inverter module of Phase 3 inverter driver board, break down or not. After the measure, find one side of Phase 3 inverter module has broken. Change it, then measure IGBT of the other two phases, its OK. Restart up, UPS operates normally. 4) EP 60 KVA UPS shows Internal fault 2, i=A001 08. Why? Fault code clews: Error at inverter power supply! Measure D21 and D20 on power supply board, find there is no output voltage. Power off, measure D21 and D20 by the multimeter, find them broken down. Change power supply board, UPS operates normally!
Internal Fault 3
When this fault happens, it may be caused by the following aspects: a. TLI winding is short. Measure the resistance of winding, the normal value is 3K or so. TLI winding power wire is well connected to No.5 and No.6 wire of J7 on interface board or not. b. Poor connection from auxiliary contactor of TLI to J7 of interface board. Mainly check the connection from No.3 and No.4 wire of J7 to TLI winding. c. Interface board is faulty.
Internal Fault 4
Rectifier fault When this fault happens, it may be caused by the following aspects: a. rectifier control board is faulty. b. rectifier driver board is broken.
Internal Fault 5
When this fault happens, it may be caused by the following aspects: a. One of the three phases input fuses on bypass board is burnt out. b. SCR (bypass board) fault.
Internal Fault 6
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Cases:
One 40KVA unit is operating normally, suddenly inverter output indicator blinks, then switch to bypass mode. Bypass indicator is blinking, and Internal fault 6 shows on panel. Restart up, blank screen. This fault happens most on units produced before 2006, the main reason is capacitance C4 on power supply board is ineffective. Change power supply board, restart up, UPS operates normally. When UPS displays the fault: 1. Measure UPS bypass input three phase fuses, and fuse F7, F3 on bypass board, burn out or not. 2. Measure the voltage of D1/D7/D8/D19/D20/D26/D27/D35 on power supply board, normal value: 15vdc. Internal Fault 7
When this fault happens, it is mainly caused by poor connection of voltage feedback signal wire on inverter control board.
Internal Fault 8
When this fault happens, it may be caused by the following aspects: a. rectifier control board is faulty. b. Absorber circuit on rectifier driver board is faulty.
Internal Fault 9
When this fault happens, it may be caused by the following aspects:
a. TLB winding is short. Measure the resistance of winding, it is about 3K or so.
TLB winding power wire is well connected to No.4 and No.6 wire of J7 on interface board
or not.
b. Poor connection from auxiliary contactor of TLB to J7 of interface board. Mainly check the
connection from No.1 and No.3 wire of J7 to TLB winding.
c. F6 of bypass board is burnt out or not.
c. Interface board is faulty.
e. Main system board is faulty.
Case:
Before delivery, after loading and aging test, when get ready to package, start up UPS, it
reports Internal fault 9. Why?
Check as the above steps, have not found suspicious point. Check the connection from TLI
to interface board, measure again, find No.1 and No.3 of J7 to TLB winding is not well
connected. It may be the wire problems which result in the poor contact. Change the wire,
UPS operates OK!
Internal Fault 10
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Cases:
Inverter mode operates normally, but sometimes report internal fault 10 and switch to
bypass mode. Why?
This failure is mainly because of the connection / poor contact of system control board and
inverter control board. Re-plug the connection terminal between J3 of system control board
and J7 of inverter control board, and the CPU of two control board. Measure the voltage of
D19/D20/D26/D27/D35 on power supply board, should be 15vdc, and voltage of D82 12vdc, voltage of D91 5vdc. If it still have problems, change the tow control board. Internal Fault 11
The failure represents: After closing SWIN / SWBY / SWOUT of UPS (that is after starting
up), press 2 - 2 can see I = 2204 40 (this parameter indicates that the inverter operates
normally), rectifier and inverter both have been started up, it is on bypass mode. When it is
on inverter mode, TLI and TLBY contactors switch back and forth!
The probabilities caused the failure are:
a. bypass board is broken.
b. main control board is faulty.
c. Interface board is faulty.
d. null line is poorly connected.
Cases:
EP 60KVA
One of the two parallel UPS units, usually reports Internal fault 11, but after the engineer
arriving at the locale, restart up and UPS operates normally. Why? After the inverter start up normally, use the multimeter measure the voltage difference between TLI and TLBY, find that after the switch failure, its about 20 VAC more than the maximum allowable value. Even change the main control board and bypass board, its still not improved obviously. It may be caused by poor contact. Check the connection of UPS again, find that output null line among the main circuit at connecting terminal is poorly connected, connect and fasten it, start up UPS and it operates normally! Briefly analyze: because of the poor connection of null line, resulting in the public
reference point of bypass circuit and inverter output circuit is offset, there exists greater voltage difference, that is not synchronized. At inverter mode there must be voltage difference 20VAC, by the feedback, the program identified as beyond the scope of synchronization, will not switch.
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3 Failure code and inquiry
The following code is EP failure information code table:
TABLE OF MEMORIZED INTERNAL CODE / TABELLA CODICI INTERNI
For decode the internal microprocessor memorized code refer to the following table:
[s =system, c=load, b=bypass, r= rectifier, i=inverter, a=alarm] (*) only in parallel version
s=X... 1 3 5 7 9 B D F High system temperature 2 3 6 7 A B E F Initialisation error 4 5 6 7 C D E F System off command active. 8 9 A B C D E F Auxiliary input on system card.
s=.X.. 1 3 5 7 9 B D F System card power supply error. 2 3 6 7 A B E F Temporary anomaly in power supply card. 4 5 6 7 C D E F Synchronism error on system card. 8 9 A B C D E F Output frequency measurement error on system card.
s=..X. 1 3 5 7 9 B D F Continuous low voltage from battery or rectifier. 2 3 6 7 A B E F Continuous low voltage pre alarm from battery or rectifier. 4 5 6 7 C D E F Battery contactor open. 8 9 A B C D E F Permanent anomaly in battery contactor.
s=...X 1 3 5 7 9 B D F Permanent anomaly in power supply card. 2 3 6 7 A B E F Presence of the signal RS232 DSR_ON.. 4 5 6 7 C D E F Configuration circuit absent. 8 9 A B C D E F Jumper CONFIG2 absent.
c=X... 1 3 5 7 9 B D F Output overload, line 2 2 3 6 7 A B E F Output overload, line 3 4 5 6 7 C D E F Permanent overload. 8 9 A B C D E F Internal or load insulation loss.
c=.X.. 1 3 5 7 9 B D F High peak output current, line 1 2 3 6 7 A B E F High peak output current, line2 4 5 6 7 C D E F High peak output current, line3 8 9 A B C D E F Output overload, line 1
c=..X. 1 3 5 7 9 B D F Instantaneous output voltage error, line 2 2 3 6 7 A B E F Instantaneous output voltage error, line 3 4 5 6 7 C D E F Average output voltage error, line 1. 8 9 A B C D E F Average output voltage error, line 2. c=...X 1 3 5 7 9 B D F - 2 3 6 7 A B E F Output switch SWOUT open 4 5 6 7 C D E F Average out. voltage error, line 3. 8 9 A B C D E F Instantaneous output voltage error, line 1
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b=X... 1 3 5 7 9 B D F Bypass line no. 3 input voltage erroneous 2 3 6 7 A B E F Bypass line frequency error 4 5 6 7 C D E F Sequence error in phases 1 and 2 at bypass line input 8 9 A B C D E F Manual bypass switch SWMB closed.
b=.X.. 1 3 5 7 9 B D F Active remote command bypass. 2 3 6 7 A B E F Static switch anomaly (SCR) for bypass 4 5 6 7 C D E F Bypass line no. 1 input voltage erroneous 8 9 A B C D E F Bypass line no. 2 input voltage erroneous
b=..X. 1 3 5 7 9 B D F SCR anomaly 2 3 6 7 A B E F Bypass line disabled. 4 5 6 7 C D E F Permanent anomaly on inverter output contactor 8 9 A B C D E F Bypass command active. b=...X 1 3 5 7 9 B D F Anomaly in inverter output contactor 2 3 6 7 A B E F Inverter output contactor open 4 5 6 7 C D E F Bypass line contactor closed. 8 9 A B C D E F Anomaly in bypass line contactor. r=X...-.. 1 3 5 7 9 B D F Low input voltage, line 2 2 3 6 7 A B E F Low input voltage, line 3. digit 1 4 5 6 7 C D E F No input current, line 1. 8 9 A B C D E F No input current, line 2 r=.X..-.. 1 3 5 7 9 B D F High input voltage, line 1 2 3 6 7 A B E F High input voltage, line 2 digit 2 4 5 6 7 C D E F High input voltage, line 3. 8 9 A B C D E F Low input voltage, line 1.
r=..X.-.. 1 3 5 7 9 B D F High rectifier temperature 2 3 6 7 A B E F High rectifier output voltage digit 3
4 5 6 7 C D E F Power supply error on rectifier control.
8 9 A B C D E F Rectifier input frequency error.
r=....X-.. 1 3 5 7 9 B D F No input current, line 3 2 3 6 7 A B E F Power limitation in rectifier. digit 4 4 5 6 7 C D E F Adjustment error in rectifier 8 9 A B C D E F Rectifier input line frequency error. r=....-X. 1 3 5 7 9 B D F Permanent anomaly rectifier 2 3 6 7 A B E F Error in voltage DRV1 in rectifier digit 5
4 5 6 7 C D E F Error in voltage DRV2 in rectifier
8 9 A B C D E F Error in voltage DRV3 in rectifier r=....-.X 1 3 5 7 9 B D F Anomaly in one section of rectifier. 2 3 6 7 A B E F -(SGP power fail *) digit 6 4 5 6 7 C D E F -(Parallel cable fail or SWMB close *) 8 9 A B C D E F -
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i=X...-.. 1 3 5 7 9 B D F Error in inverter connections 2 3 6 7 A B E F Error in inverter power supply. digit 1
4 5 6 7 C D E F Error in inverter HFDRVR signal. (parallel syncro fail *)
8 9 A B C D E F Error in inverter HFDRVS signal ((parallel UPS Master *)
i=.X..-.. 1 3 5 7 9 B D F Cables reversed on pilot 2 3 6 7 A B E F Lockup by card or module 3 in inverter digit 2
4 5 6 7 C D E F Lockup by card or module 2 in inverter.
8 9 A B C D E F Istantaneous overcurrent
i=..X.-.. 1 3 5 7 9 B D F High voltage at inverter output 2 3 6 7 A B E F High continuous voltage at inverter input digit 3
4 5 6 7 C D E F High temperature on sensor 1 in inverter
8 9 A B C D E F High temperature on sensor 2 in inverter
i=....X-.. 1 3 5 7 9 B D F Inverter anomaly 2 3 6 7 A B E F Absence of synchronism between inverter and by pass linedigit 4
4 5 6 7 C D E F Active manual zeroing of inverter control
8 9 A B C D E F Auxiliary feeder error for IGBT modules
i=....-X. 1 3 5 7 9 B D F Low alternating voltage at inverter output 2 3 6 7 A B E F Low continuous voltage at inverter output digit 5
4 5 6 7 C D E F Active manual zeroing of inverter control.
8 9 A B C D E F Permanent inverter anomaly
i=....-.X 1 3 5 7 9 B D F High temperature on sensor 3 in inverter 2 3 6 7 A B E F Lockup by card or module IGBT3 in inverter digit 6
4 5 6 7 C D E F HFDRVT signal error in inverter (parallel serial data fail *)
8 9 A B C D E F Inverter disablement. a=X...-.... 1 3 5 7 9 B D F LOW BATTERY VOLTAGE 2 3 6 7 A B E F LOW INPUT VOLTAGE OR OVERLOAD [W]. digit 1
4 5 6 7 C D E F BATTERY DISCHARGED OR SWB OPEN
8 9 A B C D E F OUTPUT OVERLOAD. a=.X..-.... 1 3 5 7 9 B D F DISTURBANCE ON BYPASS LINE 2 3 6 7 A B E F MANUAL BY PASS, SWBM ON digit 2
4 5 6 7 C D E F BY PASS LINE VOLTAGE FAIL or SWBY, FSCR OFF
8 9 A B C D E F MAINS LINE VOLTAGE FAIL or SWIN OFF a=..X.-.... 1 3 5 7 9 B D F INTERNAL FAULT: 3 output contactor 2 3 6 7 A B E F INTERNAL FAULT: 4 rectifier lockup digit 3
4 5 6 7 C D E F INTERNAL FAULT: 5 bypass SCR.
8 9 A B C D E F INTERNAL FAULT: 6 feeder lockup.
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a=...X-.... 1 3 5 7 9 B D F TEMPORARY or PERMANENT BYPASS 2 3 6 7 A B E F BYPASS FOR OUTPUT VA < AUTO_OFF digit 4 4 5 6 7 C D E F INTERNAL FAULT: 1 no circ configuration. 8 9 A B C D E F INTERNAL FAULT: 2 inverter lockup a=....-X... 1 3 5 7 9 B D F BYPASS FOR OUTPUT OVERLOAD 2 3 6 7 A B E F ACTIVE BYPASS COMMAND; 8=COMMAND OFF digit 5
4 5 6 7 C D E F REMOTE BYPASS COMMAND: ACTIVE.
8 9 A B C D E F LOSS OF INTERNAL OR EXTERNAL INSULATION a=....-.X.. 1 3 5 7 9 B D F INTERNAL FAULT: 7 system card power supply. 2 3 6 7 A B E F INTERNAL FAULT: 8 one rectifier section digit 6
4 5 6 7 C D E F INTERNAL FAULT: 9 battery contactor.
8 9 A B C D E F INTERNAL FAULT: 10 inverter - converter comunicat a=....-..X. 1 3 5 7 9 B D F REMOTE SYSTEM OFF COMMAND: ACTIVE. 2 3 6 7 A B E F memory changed: CODE=.... digit 7 4 5 6 7 C D E F - INTERNAL FAULT: 11, inverter output connection or
bypass 8 9 A B C D E F - stop for internal timer a=....-...X 1 3 5 7 9 B D F OVERTEMPERATURE OR FAN FAILURE. 2 3 6 7 A B E F ERRONEOUS INPUT PHASE SEQUENCE. digit 8
4 5 6 7 C D E F OUTPUT OFF CLOSE SWOUT OR SWMB
8 9 A B C D E F SYSTEM OFF COMMAND ACTIVE; 8=DISACTIVATION.
p=X...-.. 1 3 5 7 9 B D F -Parallel card, RS 232 TX fail 2 3 6 7 A B E F - not used
digit 1 4 5 6 7 C D E F - not used 8 9 A B C D E F - Parallel card, spare line failure
p=.X..-.. 1 3 5 7 9 B D F - Parallel card, Bypass line failure 2 3 6 7 A B E F -Parallel card, Link failure Aux SWMB ON
digit 2 4 5 6 7 C D E F -Parallel card, RS 232 line failure 8 9 A B C D E F -Parallel card, Synch. line fail
p=..X.-.. 1 3 5 7 9 B D F -Parallel card, RS 232 rx fail 2 3 6 7 A B E F -Parallel card, Cable fail aux. SWMB ON
digit 3 4 5 6 7 C D E F -Parallel card, power fail 8 9 A B C D E F - not used
p=...X-.. 1 3 5 7 9 B D F -Parallel card, Ups master 2 3 6 7 A B E F - not used
digit 4 4 5 6 7 C D E F -Parallel card, slave data ok 8 9 A B C D E F -Parallel card, Synch. inverter bus fail
p=....-X. 1 3 5 7 9 B D F - not used 2 3 6 7 A B E F - not used
digit 5 4 5 6 7 C D E F - not used 8 9 A B C D E F - not used
p=....-.X 1 3 5 7 9 B D F -Parallel card, Synch. master-mains fail 2 3 6 7 A B E F -Parallel card, Synch. master freq. 60Hz on
digit 6 4 5 6 7 C D E F - not used
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8 9 A B C D E F - not used
Examples of inquiry method: a = 1003 - 0008
Find column-related information about a in the table:
a = 1 ... .. the corresponding right message: Low battery voltage
a =.0.. .. the corresponding right message: 0 for no fault, no matter.
a =..0. .. the corresponding right message: 0 for no fault, no matter.
a = ... 3 .. the corresponding right message: Temporary or permanent Bypass
a=. 0. the corresponding right message: 0 for no fault, no matter.
a=. ... the corresponding right message: The same as above.
a=. ...8 the corresponding right message: system off command
active:8=disactivation
i = B00008
I=B..... the corresponding right message: Error in inverter connection
i=.0000. the corresponding right message: 0 for no fault, no matter.
i=..8 the corresponding right message: inverter forbid
Other fault code inquiry information method is same as the above method, it will not be
repeated any more.
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4 Parallel maintenance
When carry out the maintenance, can refer to the following steps: 1) First remove the communication connecting cable between two parallel units, change into single unit operation. Switch the normal operating UPS unit to bypass mode, then close SWMB, and remove the communication connecting cable between the two parallel units. And connect the terminal. Failure UPS has been shut down, so can be directly removed, but the terminal must be connected. After removed the failure UPS, can switch the normal operating UPS to inverter output mode. 2) After finishing the maintenance of failure UPS, when no-load operating test is required, can change auxiliary NC contact beside SWOUT into NO contact. Close SWIN and SWBY, if the UPS has been maintained, it will switch into inverter output mode automatically, but will not affect the operation of parallel UPS unit. 3) After no-load operating test is finished, shut down the UPS, repeat the above step 2 -> step 1, restart up the two UPS units, parallel and operate them.
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5 Instructions of EP Series singe unit into parallel units:
10KVA80KVA
After receiving the UPS parallel kit, please confirm the components contained in the list, whether there are omitted or damaged parts.
Table 1. parallel kit components list table
Parts Name Parts Specification No. remark parallel installation manual
EP10-80KVA 1
parallel board C13943A 1 short block common use 2 parallel terminal female
DB9 1
parallel terminal male
DB9 1
parallel cable 1 3H/DML-9P+9S/2500MM 1 supporting bracket
2*DB9 1 parallel cable 1 has already connected with supporting bracket
parallel cable 2 2H/101-26P*2/300MM 1 parallel cable 3 3H/5557HP+5557HP+5557HP/200
0MM 1
parallel cable 4 2H/5557HP-2*3P*2/2000M 1 contactor auxiliary contact
F3-11D 1 parallel cable 4 has already connected with contactor auxiliary contact
parallel communication cable
2H/DB-9P+DB-9S/6000MM 1
Nylon terminal 10A/1P transparent 1 Nylon PCB support
for EP 3 for EP10-40K selection
Screw 1 M4*16 hexagon externality 1 for EP10-40K selection
Screw 2 M5*12 1 Screw 3 M3*8 4 for EP60-80K
selection Nut 1 M4 3 for EP10-40K
selection Nut 2 M5 1
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Parallel cable 1
Parallel cable 2
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Parallel cable 3
Parallel cable 4
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1. Installation
Before the installation, please remove the internal panel, right panel, control panel, top panel of parallel UPS units. Please install the kit components for parallel UPS units as the following steps. Install parallel control board: If the model is EP10-40KVA UPS, please accord [1] to install parallel board; If the model is EP60-80KVA UPS, please accord [2] to install parallel board; [1] Pull out 26P cable from J3 on system control board. Use nylon PCB support, Screw 1, Nut 1 to fix parallel board at the 4 holes before system control board, J1 and J2 of parallel board is on the left. The fixed-hole on upper right corner is grounding terminal of parallel board, use Screw 1 to connect it, use two units of Nut 1 to support between the rack and PCB board, then use one unit of Nut 1 to fix PCB board. Parallel cable 2 is used to connect J3 of system control board to J1 of parallel board. The pulled out 26P cable from J3 of system control board is connected to J2 of parallel board.
Cable 1
Cable 2 System board Parallel
board
Cable 3
26P cable pulled out from J3 of system control board is connected to J2 of parallel board.
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[2] Pull out 26P cable from J7 on inverter control board. Use Screw 3 to fix parallel board at the 4 fixed legs before inverter control board, J1 and J2 of parallel board is on the left. Parallel cable 2 is used to connect J7 of inverter control board to J2 of parallel board. The pulled out 26P cable from J7 of inverter control board is connected to J1 of parallel board.
2. Install other parallel cable:
Parallel cable 1 male terminal is connected to parallel control board J4. Use Screw 2 and Nut 2 to mount supporting bracket on the bottom which is under RS232 communication port.
1) 2*4P terminal of parallel cable 3 is connected to J5 of parallel board. 2) Remove the 12 pole terminal J7 of the interface board, connect it to 5557HP/2*6P needle
Cable 2 is connected J3 of system control board to J1 of parallel board.
Connect 9 pole male side of cable 1 to J4 of parallel board.
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block of parallel cable 3 . 3) 2*6P terminal of parallel cable 3 is connected to needle block J7 on interface board. 4) Bridge the cables that originate from the auxiliary of the SWMB switch using the nylon terminal. Substitute the originate cables bridged above with the two cables of parallel cable 3.
Connect the two separate terminal of cable 3 to SWMB auxiliary switch.
Connect 2*4P terminal of cable 3 to J5 of parallel board.
J7 of interface board Removed J7 terminal and 2*6P needle block of cable 3 J7 of interface board Removed J7 terminal and 2*6P needle block of cable 3
Connect 2*4P terminal of cable 3 to J5 of parallel board.
J7 of interface board Removed J7 terminal and 2*6P needle block of cable 3
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5) Substitute the connecting cable between J1 of auxiliary power supply board and J3 of SCR bypass board with parallel cable 4. 2*3P terminal (five wires) of parallel cable 4 is connected to J3 of SCR bypass board. 2*3P terminal (four wires) of parallel cable 4 is connected to J1 of auxiliary power supply board. Remove the top cover of inverter output contactor TLI, install the auxiliary contact to TLI contactor.
Connect the two terminals that originate from SWMB auxiliary switch using the nylon terminal (10A/1P transparent)
Substitute the original cable connecting J1 of power supply board with J3 of SCR bypass board with cable 4.
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2*3P terminal (five wires) of Cable 4 J3 of SCR bypass board 2*3P terminal (four wires) of Cable 4 J1 of power supply board
Remove the cover of TLI, install auxiliary contact to TLI contactor.
J1-1 (cable 4) is connected to the self-owned auxiliary contact 54, 62
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6) Install the connection between UPS and other parts: Install short block 1 on JP3 of system control board. Insert a male plug terminal (or female plug terminal) into the parallel terminal of first UPS unit; Use parallel connecting cable to connect the first UPS unit terminal to the second UPS unit terminal; Use parallel connecting cable to connect the second UPS unit terminal to the third UPS unit terminal; Insert a female plug terminal (or male plug terminal) into the parallel terminal of last UPS unit. 7) Parallel all the input and output of parallel UPS units by cables.
J3-1 (cable 4) is connected to the self-owned auxiliary contact 53 (NO) J3-3 (cable 4) is connected to the self-owned auxiliary contact 61 (NC)
JP3
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3. Check the connection:
Input / output cable is connected correctly and firmly Parallel connecting cable is firm, enter the UPS from the back or side Terminal connection is firm Internal signal cable is connected correctly and firmly After checking the electrical connections and internal connections, install the right panel, control panel, top cover of all the parallel UPS, internal panel is not installed temporarily.
Start up Before starting up, please confirm that the parallel UPS units share the battery pack or use a separate battery pack for each UPS. If share the battery pack, please install a short block at JP1 on rectifier control board of all the parallel UPS units. 1. Close SWBY of first UPS unit, you can see the UPS model "RT10, P" displayed on control panel (if the UPS model is EP10K). It means the UPS unit is EP10K parallel, and this UPS is defaulted as the Master UPS of all parallel UPS units. 2. If the parallel UPS units share battery pack, get into the control panel menu: 3 -> 5, input the code: 467123. At this time you will see the UPS model "RT10, B" displays on control panel (if the UPS is EP10K). It means the parallel EP10K UPS units share the battery pack, and this UPS is defaulted as the Master UPS of all parallel UPS units. 3. Close SWIN and SWOUT of the first UPS unit, wait the UPS into normal operating mode (NOMAL OPERATION). 4. Close SWBY of the second UPS unit, you will see the UPS model "RT10, p" dispalys on control panel (if the UPS model is EP10K), it means the UPS unit is EP10K parallel, and this UPS is defaulted as the Slave UPS of all parallel UPS units. If the parallel UPS units share battery pack, you will see the UPS model RT10, b displays on control panel (if the UPS is EP10K). It means the parallel EP10KUPS units share the battery pack, and this UPS is defaulted as the Slave UPS of all parallel UPS units. Close SWIN of the second UPS unit, get into the control panel menu 2>2 and wait till displaying I=220V. Close SWMB and then open, then all the started up UPS units switch to bypass mode. When the first UPS switches back to inverter mode, measure the voltage difference V1 of SWOUT upper and lower R, S, T phases on second UPS unit with multimeter AC posotion, if V1
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