Download - Whitlock DNFT (2)
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Material.................................................Stainless Steel, AluminumTemperature Range........................................... -40 F to +185 FSwitch Rating............................10 VA/240 VDC- 10VA/150 VAC**Epoxy Encapsulated............................UL LISTED EL-CAST VFR 641Power..................................................................... Lithium BatteryAlarm/Shutdown........................ Factory default for 3 minute alarm*PRG is programmable from 20 seconds to 4 minutes 15 seconds**10VA/150VAC P/N A-7210 & A-7211 only.
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MONITORS MOVEMENT OF DIVIDER VALVEPISTON FOR DEPENDABLE "TIMED" SHUTDOWNPROTECTION
CLOSED LOOP OR OPEN LOOP OPERATION
INSTALLS DIRECTLY TO DIVIDER VALVE
NOT AFFECTED BY TEMPERATURE OR OILVISCOSITY
REQUIRES NO EXTERNAL POWER
The DNFT-LED is a totally enclosed electronic device, combining the latesttechnology in microprocessor and transistor components for detectingSlow-Flow and No-Flow of divider block lubrication systems. The DNFTincorporates an oscillating crystal to accurately monitor the cycle time ofthe lubrication system to enable precision timed shutdown capability. Themagnet assembly and control housing mount directly to the divider valve tobecome an integral part of the lubrication system. The DNFT operates oninternal lithium battery power, with an expected life of 6 to 10 yearsdepending on cycle time. PRG-RB model has replaceable battery. If batteryvoltage drops below normal operating levels, the DNFT goes into alarmmode and the unit cannot be restarted. The DNFT comes in a wide range ofmodels to switch voltages of 240 VDC or 150 VAC. Both LED and PRG-RBmodels utilize an LED to indicate each cycle of the divider valve. Thisenables the operator to easily set and monitor lubrication rates. The PRG-RB model comes with a liquid crystal display to display total pints, cycletime of divider valve, total cycles of divider valve, and pints per day pumprate. The PRG-RB can easily be programmed for an alarm time from 20seconds to 4 minutes 15 seconds.
Lubricant flow through the divider valve assembly forces the pistons tocycle back and forth causing a lateral movement of a magnet linked to thepiston. Movement is monitored by the microprocessor which resets thetimer, lights the LED, and allows the unit to continue operation. Thisindicates one complete cycle of the lubrication system. Themicroprocessor must receive this cycle in a predetermined time or ashutdown will occur. The DNFT will automatically reset alarm circuit whennormal operation of divider valve resumes.
BULLETIN#A-0012-23-99
OPERATION
LED INDICATOR OR LCD DISPLAY
PRG-RB IS PROGRAMMABLE TO DISPLAY:TOTAL PINTS
PINTS PER DAY PUMP RATETOTAL DIVIDER VALVE CYCLESCYCLE TIME OF DIVIDER VALVE
PROGRAMMABLE ALARM TIME (PRG-RB MODEL)
DEDICATED SWITCH CLOSURE TOMONITOREACH DIVIDER VALVE CYCLE (PS OPTION)
DNFT-LED-PS
ARIEL Corporation35 Blackjack Rd.
Mount Vernon, Ohio 43050(740) 397-0311 Fax (740) 397-3856DIGITAL NO-FLOW TIMER
DNFT-PRG-PS
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DNFT-LED-PS - A-6348
DNFT-LED-PS - A-6348
HEX MAGNETHOUSING
(C)MAGNET
(H)
SPRINGSPACER
O-RING SEAL(F)
ALLEN HEADSET SCREWS (2)
(A)DNFT
(B)
REDORANGEBLACKGREENYELLOWYELLOW
WIRE LEADS(I)
#22 AWG 18" LEADS(4) STANDARD
(6) WITH PROXIMITY SWITCH OPTION
Control PanelAnnunciator
or PLC
Wiring Diagram ForNORMALLY CLOSED OPERATION (CLOSED LOOP)
RED-INSULATE FROM CONTACTDO NOT USE
ORANGE-TO LUBE NO-FLOW IN CONTROL PANEL "+" POLARITY
BLACK-TO COMMON IN CONTROL PANEL "-" POLARITY
GREEN WIRE-GROUND SECURELY
(2) YELLOW WIRES DEDICATED SWITCH CLOSURE TO MONITOREACH DIVIDER VALVE CYCLE
INSULATE FROM CONTACT WHEN NOT IN USE
(2) YELLOW WIRES DEDICATED SWITCH CLOSURE TO MONITOREACH DIVIDER VALVE CYCLE
INSULATE FROM CONTACT WHEN NOT IN USE
RED WIRE
ORANGE WIRE
BLACK WIRE
YELLOW WIRE
GREEN WIRE YELLOW WIRE
Control PanelAnnunciator
or PLC
Wiring Diagram ForNORMALLY OPEN OPERATION (OPEN LOOP) ORANGE-INSULATE FROM CONTACT
DO NOT USE
RED-TO LUBE NO-FLOW IN CONTROL PANEL "+" POLARITY
RED WIRE
ORANGE WIRE
BLACK WIRE YELLOW WIRE
GREEN WIRE YELLOW WIRE
GROUNDCONNECT BLACK AND GREEN WIREGROUND SECURELY
SWITCH RATING10VA/240VDC MAX
SWITCH RATING10VA/240VDC MAX
24S
INTERNAL VIEW OFDIVIDER VALVE HOUSING
PISTON ENCLOSURE PLUG(D)DIVIDER VALVE
(E)
O-RING SEAL(F)
WIRE LEADS(I)
TYPICAL INSTALLATIONDNFT
DNFT-LED-PS
REDORANGEBLACKGREENYELLOW
DNFT(B)
ALLEN HEADSET SCREWS (2)
(A)
BULLETIN#A-6348-22-23-99ARIEL Corporation
35 Blackjack Rd.Mount Vernon, Ohio 43050
(740) 397-0311 Fax (740) 397-3856DIGITAL NO-FLOW TIMER
ARIEL # A-6348
YELLOW
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B. Spring or Magnet is
1. LED does NotBlink, ControlPanel IndicatesLube No-Flow
(See also, 3.Erratic shutdown)
2. After installation ofDNFT, Rupture Disc isBlown and Divider Valve isLocked up.
AssemblyBroken in Magnet
(See magnetassy. Below)Installed on Divider Valve
A. Wrong Magnet Housing
A. Improperly Adjusted
Loosen set screws, slide DNFT all the way onto hex of magnet housing andtorque to 25 inch pounds max.( Cycle divider valve bypumping clean oil through system with lubrication system purge gun or runningcompressor. If necessary, adjust DNFT 1/16 back until LED blinks with eachcycle of divider valve.
Do not over tighten)
Loosen set screws, remove DNFT from magnet housing. Remove magnetassembly from divider valve. Remove magnet, spacer and spring. Checkcomponents for damage. Replace damaged spring or magnet and install ondivider valve. If necessary, adjust DNFT, check for LED blink. Purge air fromsystem with lubrication system purge gun.
Loosen set screws, remove DNFT from magnet housing. Check for damaged orbent magnet housing. Remove magnet assembly from divider valve. Replacemagnet housing, magnet, spring and spacer. Re-install DNFT on magnethousing. If necessary, adjust DNFT, check for LED blink. Purge air fromsystem with lubrication system purge gun.
b l i n k .ohms. If over 10 ohms, replace DNFT. If necessary,adjust DNFT, and check for LEDmagnet, meter should read 10 Megs. When DNFT alarms, meter should read 3.5 to 6.5ohmmeter, red lead to red wire and black lead to black wire. Set meter to ohms. DepressLoosen set screws, remove DNFT from magnet housing. Disconnect wiring and attach
4. DNFT Will NotShow Alarm Connections
A. Incorrect Wiring Reverse wiring connections in control panel. DNFT is polarity sensitive.
NOTICE: WHEN MORE THAN ONE DNFT IS INSTALLED ON THE COMPRESSOR OR ENGINE, EACH DNFT MUST BE WIRED TO A SEPARATE ALARMCIRCUIT ON THE CONTROL PANEL, ANNUNCIATOR OR PLC TO SIMPLIFY TROUBLESHOOTING THE LUBRICATION SYSTEM AND DNFT.
System.Divider Valve
B. Air or Debris inCheck system pressure insure oil is flowing to divider valves. If necessaryinstall pressure gauge tomonitor operation of lubrication system.
1. outlet plugs in front of valve blocks. Fast purge the system withuntil clean, clear, air free oil appears from plugs.
2. each piston enclosure plug individually to purge air from behindpiston. Do not remove piston enclosure plugs. Tighten all divider valve plugs.Adjust DNFT.
Loosen
Loosenlubrication system purge gun
To insure proper operation of the divider block lubricationsystem, it is absolutely necessary that all tubing and components be filledwith oil and free of air before start-up.
3. Erratic Shutdownor LED blink
B. Air in System (see 2B.)
C. Faulty Lube Pump
Control PanelA. Faulty wiring from DNFT to
Check system pressure to insure oil is flowing to divider valves. If necessary,install pressure gauge to monitor operation of lubrication system. Check gaugeto insure pump will build sufficient pressure to inject oil into cylinder. You cannotcheck for oil flow into cylinder by removing tubing from check valve and pumpingoil to atmosphere. Replace pump.
Disconnect wiring from DNFT in control panel and attach ohmmeter leads. Totalimpedance in alarm state should be less than 10 ohms. Run new wiring toDNFT and recheck impedance. Air in divider valve system. (See 2B. Above)
DNFT must be installed with correct magnetassembly for each divider valve manufacturer.
Magnet Assemblies and Applications
Magnet Assy # A-6507
Trabon O-Ring Seal1995 and Later7/16"-20
Trabon Metal Gasket Seal1994 or Earlier7/16"-20
Magnet Assy # A-6506
Magnet Assy # A-6508Lincoln O-Ring SealExtended Nose7/16"-20
C. Low Battery voltage
CAUTION: DISCONNECT ALL WIRING PRIOR TO WELDING ON
24S
INTERNAL VIEW OFDIVIDER VALVE
PISTON ENCLOSURE PLUG
DIVIDER VALVE
O-RING ORMETAL GASKET
#18 AWG 18" LEADS (4)(6) WITH PROXIMITY SWITCH
REDORANGEBLACKGREEN
DNFTALLEN HEADSET SCREWS (2)
TYPICAL INSTALLATIONDNFT
BULLETIN#A-0032-23-99ARIEL Corporation
35 Blackjack Rd.Mount Vernon, Ohio 43050
(740) 397-0311 Fax (740) 397-3856DIGITAL NO-FLOW TIMER
YELLOWYELLOW
HEX MAGNET HOUSING
MAGNET
SPACER SPRING
TROUBLESHOOTING DNFT-LED
24S
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WHITLOCK INSTRUMENT1300 N. Texas Odessa, TX. 79761
(915) 337-3412 Fax (915) 335-59261-800-337-3412
BULLETIN#AD-0012-23-99ARIEL Corporation
35 Blackjack Rd.Mount Vernon, Ohio 43050
(740) 397-0311 Fax (740) 397-3856DIGITAL NO-FLOW TIMER