parallel operation (8-15kva)

7/30/2019 Parallel Operation (8-15kVA)

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Parallel operation guide

for 8-15 kVA UPSs


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1024634 Parallel operation guide for 8-15 kVA UPSs 2/11Revision A1

Contents

1 GENERAL ...................................................................................................................................................3

1.1 SYSTEM OVERVIEW ........................................................ ........................................................... ............. 3

1.2 UNPACKING AND INCOMING INSPECTION..................................................... ........................................... 3

2 INSTALLATION ........................................................................................................................................3

2.1 ENVIRONMENT ..................................................... ........................................................... ....................... 3

2.2 INSTALLATION INSTRUCTIONS ............................................................ .................................................... 3

2.3 SPM TIE CABINET........................................................... ........................................................... ............. 4

2.4 X-SLOT HOT SYNC CARD: INSTALLING AND WIRING ....................................................... ....................... 8

3 PARALLEL OPERATIONS.................................................................................................................... 10

3.1 START-UP ................................................... ........................................................... ............................... 10

3.2 SHUTDOWN .......................................................... ........................................................... ..................... 11


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1 General

This manual completes the main Users Guides (1022403 for UPSs with single phase output or1023294 for UPSs with three phase output), when 8 15 kVA UPS is connected in parallel mode.Please read first the Users Guide of the UPS and install the parallel system according to this manual.

1.1 System overview

This parallel system consists up to fourequal power size units and a parallel module. UPSs aredouble conversion on-line units for protection of computer systems and other intelligentdevices as measurement instruments and industrial automation applications. The unitscondition the raw mains and supply continuous, clean power to the critical systems. Whilefeeding the load all the UPSs in the system will continue to supply clean power without anyinterruption at the UPS output.

The outputs of the UPSs are combined in the parallel module and then connected to the

load. In normal operation the load is shared equally by all the UPSs in the system.

1.2 Unpacking and incoming inspection

Unpack the equipment and remove all the packing materials and shipping cartons.

The equipment must be inspected for damage after shipment. If damage has occurred duringtransit all the shipping cartons and packing materials should be stored for further investigation. Ifthe damage is visible a claim for shipping damage must be filed immediately.

To file a claim for shipping damage:

The carrier must be informed within 7 days of receipt of the equipment.

The equipment must be checked against the packing list to verify that the shipment is complete. Theequipment is thoroughly inspected at the factory. If there are no damages or discrepancies, theinstallation may proceed.

2 Installation

2.1 Environment

All the requirements concerning environment described in this Chapter (Installation) must be met. Ifthey are neglected the manufacturer cannot guarantee the safety of personnel during installation or

use, or that the unit will function properly.

Install the UPS and battery cabinets according to the main instruction.

The following requirements are for the UPS.

- Provide shelter from the elements (especially moisture)

- Maintain clearance at front of the UPS for installation and service.

2.2 Installation instructions

The electrical planning and installation of the UPS parallel system must be done by qualifiedpersonnel only. Connect the UPSs accordingly to the main Users Guides (1022403 or


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1023294). The UPS manufacturer provides a solution how to combine outputs of three UPSs inparallel system (see chapter SPM tie cabinet).

2.3 SPM tie cabinet

The System Parallel Module (SPM), provided by UPS manufacturer, has input connections up tothree parallel UPS modules. It is also possible to use two redundant UPS modules and one bypassconnection. This bypass option can be used for service or test purposes.

Note!It is not allowed to feed the load simultaneously from mains (bypass) and inverter(s) of theUPS unit(s). While turning the switch, where the bypass is connected, ON/OFF, UPS shouldbe on static bypass mode or shut down.

Note!The maximum load supported by the system is limited to 15 kVA if there are two UPSs andbypass connected to SPM (See Figure 4).

Terminals of the SPM have two-wire connection (L1 and N) and ground terminals. The upper groundterminal is for a load cable and the lower ground terminal is for UPSs. The wiring shall be doneaccording to the wiring diagrams (Figure 3 and Figure 4). The terminals and cable routing is shown inFigure 2. See also the main Users Guides (1022403 or 1023294) for cable and fuse ratings for thedifferent UPS ratings.

Figure 1 Dimensions of the SPM


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Figure 2 Cable routing of the SPM: 1-phase model on the left and 3-phase model on the right

Figure 3 SPM9155 wiring diagram with three UPSs connected.


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Figure 4 SPM9155 wiring diagram with two UPSs and bypass connected.

Figure 5 SPM9355 wiring diagram with three UPSs.


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Figure 6 SPM9355 wiring diagram with two UPSs and bypass connected.

Note!Protection fuses need to be used for load cabling if manufacturers SPM (or similar) not used.

Required parallel system wiring length should be in accordance with the following rule, as referencedto the diagram below to ensure approximately equal current sharing when in static bypass mode (seeFigure below:

Total length of 1A + 1B = Total length of 2A + 2B

= Total length of 3A + 3B

= Total length of 4A + 4B

This rule has a tolerance of approximately 10% for the combined input and output wire lengths. Ifinstalling only two UPS modules, this requirement is no longer required as each UPS is capable ofsupporting the full bypass requirement. However, this would preclude future expansion.


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Figure 7 Bypass wiring diagram and cable length notes.

Note!Signal input cables need to be connected to all UPS when used.

2.4 X-Slot Hot Sync card: installing and wiring

To enable parallel operation all the UPSs in the system need the X-Slot Hot Sync card (see Figurebelow) installed into an open X-Slot on the front of the UPS (see chapter X-Slot communication fromthe UPSs Users Guide).


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Figure 8 X-Slot Hot Sync card and terminal interface

The Hot Sync communication wiring procedure should be done with shielded twisted pair (STP) aspresented in the figure below. The maximum length of the cable is 40 m with shield connected to theterminal pin 10 from end of the both cables. Pay attention that you dont mix the polarity among theUPS modules.

Figure 9 Communication cabling wiring


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Note!X-Slot Hot Sync card has built-in termination resistor enabled by a jumper J7. The defaultjumper setting without termination resistor is J7: Pin 2-3. The first and the last UPS modulesshould have the termination resistor enabled by connecting Pins 1 and 2 with the jumper J7.

Figure 10 X-Slot HotSync card and jumper settings: Resistor ON: PIN 1 and PIN 2 connected, No

resistor: PIN 2 and PIN 3 connected (default setting)

3 Parallel operations

3.1 Start-up

Note!Before start-up make sure that UPS installations have been carried out correctly and groundconnections of both UPS units and parallel module have been connected. Check also thatthe X-Slot Hot Sync cards are installed correctly and the communication line between UPSsis connected according to figure Communication cabling wiring.

When installation is completed correctly the start procedure can be started.

Note!If some settings are changed from User settings the same changes need to be doneseparately to all of the UPSs in the system.

Carry out the following procedure to each UPS you want to have in system

1. Turn the battery and input circuit breakers to ON position.

2. UPS will enter a stand-by mode and starts to charge batteries with a cooling fan operational.Output is without the voltage in the stand-by mode.

3. Push any key of the control panel to enable the functions of the LCD screen

4. Select unit number in parallel system: Unit #1, Unit #2, Unit #3 or Unit #4. Select:SETTINGS -> USER SETTINGS -> PARALLEL OPERATION SETTINGS -> PARALLELUNIT NUMBER

5. Select minimum units to support load: 0-4. Select: SETTINGS -> USER SETTINGS ->PARALLEL OPERATION SETTINGS -> MINIMUM UNITS TO SUPPORT LOAD

Do the following item (item 6) only for one UPS, which belongs to the system

6. Return to main menu and select TURN SYSTEM ON


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All the UPSs shall check their internal functions, synchronize to bypass and start to supply the load.

Note!After the first start the load sharing of the system needs to be calibrated. Before starting thecalibration the system needs to support some load.

7. Select: SETTINGS -> USER SETTINGS -> PARALLEL OPERATION SETTINGS -> STARTAUTO CALIBRATION

3.2 Shutdown

While system is running and UPSs are supporting load, there are two different ways to perform ashutdown. The user can select either to shutdown the whole system or only one UPS.

1. Select TURN SYSTEM OFF from the main menu => All the UPSs in the system will go tostand-by mode.

2. Select TURN UPS OFF => Only the selected UPS will go to stand-by mode.

When UPS is in stand-by mode it still charges its batteries and uses cooling fans. Stand-by modepossibles a fast restart. If some UPS or all the UPSs in the system need to be shutdown completely,proceed to item 3.

3. Select TURN UPS OFF and press and hold button for 5 seconds. There shall be anindication sound during the hold.

4. UPS shall do a shutdown routine.

5. Turn the battery and input circuit breakers to off position to finalise the shutdown procedure.

parallel operation (8-15kva)

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