The DNFT-PRG is a totally enclosed electronic device, combining the latest technology in microprocessor and transistor components for detecting Slow-Flow and No-Flow of divider block lubrication systems. The DNFT incorporates an oscillating crystal to accurately monitor the cycle time of the lubrication system to enable precisely timed shutdown capability. The magnet assembly and control housing mount directly to the divider valve to become an integral part of the lubrication system. The DNFT-PRG operates on field replaceable lithium battery. If battery voltage drops below normal operating levels, the DNFT goes into alarm mode and the unit cannot be restarted. The PRG utilizes a LED to indicate each cycle of the divider valve. This enables the operator to easily set and monitor lubrication rates. The PRG comes with a liquid crystal display to display total pints, cycle time of divider valve, total cycles of divider valve, and pints per day pump rate. The PRG can easily be programmed for an alarm time from 20 seconds to 4minutes 15 seconds.
OPERATION
Lubricant flow through the divider valve assembly forces the pistons to cycle back and forth causing a lateral movement of a magnet linked to the piston. Movement is monitored by the microprocessor which resets the timer, lights the LED, and allows the unit to continue operation. This indicates one complete cycle of the lubrication system. The microprocessor must receive this cycle in a predetermined time or a shutdown will occur. The DNFT will automatically reset alarm circuit when normal operation of divider valve resumes.
SPECIFICATIONS
Temperature Range........................................................ -40C to +55C
Switch RaTing.............................................................2.5VA/240 VDC
Epoxy Encapsulated..................................UL LISTED EL-CAST VFR 641
Alarm/Shutdown..................................Programmable - 20 sec to 4 min 15 sec alarm
Power......................................................Field Replaceable - Lithium Battery
Battery.................................................................................. P/N 000505
Divider Block Application......................Dropsa/Lincoln/SBCO/Lubriquip
Warranty..................................................................................2.5 Years />
MONITORS MOVEMENT OF DIVIDER VALVE PISTON FOR DEPENDABLE "TIMED" SHUTDOWN PROTECTION CLOSED LOOP OR OPEN LOOP OPERATION
INSTALLS DIRECTLY TO DIVIDER VALVE
NOT AFFECTED BY TEMPERATURE OR OIL VISCOSITY
REQUIRES NO EXTERNAL POWER
FIELD REPLACEABLE BATTERY
LED INDICATOR AND LCD DISPLAY
PRG IS PROGRAMMABLE TO DISPLAY: TOTAL PINTS PINTS PER DAY PUMP RATE TOTAL DIVIDER VALVE CYCLES CYCLE TIME OF DIVIDER VALVE
PROGRAMMABLE ALARM TIME
DEDICATED SWITCH CLOSURE TO MONITOR EACH DIVIDER VALVE CYCLE (PS OPTION)
TROUBLESHOOTING DNFT-PRG
NOTICE: WHEN MORE THAN ONE DNFT IS INSTALLED ON THE COMPRESSOR OR ENGINE, EACH DNFT MUST BE WIRED TO A SEPARATE ALARM CIRCUIT ON THE CONTROL PANEL, ANNUNCIATOR OR PLC TO SIMPLIFY TROUBLESHOOTING THE LUBRICATION SYSTEM AND DNFT.
P/N 000518 DNFT-PRG PROGRAMMABLE DIGITAL NO-FLOW TIMER INSTALL ON TRABON* DIVIDER BLOCK WITH O-RING SEALS. SWITCH RATING 2.5VA / 240VDC
NOTICE: DNFT-PRG MUST BE PROGRAMMED BEFORE INSTALLING ON DIVIDER VALVE (SEE PROGRAMMING INSTRUCTIONS)
1. Loosen all Allen head set screws (A) on DNFT (B) and remove magnet housing (C). Do not remove magnet, spring or spacer from magnet housing.
2. Remove piston enclosure plug (D) from end of divider valve where DNFT will be installed. The DNFT does not have to be installed on the top divider valve. It may be installed on any convenient divider valve, top to bottom. (Notice: Do not install DNFT on Lincoln divider valves with cycle indicator pins or any Dropsa divider valve less than SMX 16.)
3. Be sure O-ring or metal gasket (F) is in place on magnet housing (C). Screw magnet housing (C) into end of divider valve (E). Torque to 15 foot pounds max.
4. Slide DNFT (B) all the way onto hex of magnet housing (C). Tighten set screws on hex of magnet housing. Torque25 inch pounds max.
5. If number on LCD (G) does not change, or LED does not blink, DNFT must be adjusted. Before adjusting DNFT, divider valve must be cycling with compressor running or by manually pumping oil into the divider valve. Notice: The self-check circuitry indicates normal operation and battery voltage by a continuous faint blink of the LED. Normal cycle indication is a bright strobe type blink.
6. Adjustment is made by sliding the DNFT (B) all the way on the hex of the magnet housing (C). Tighten set screws on hex of the magnet housing to 25 inch pounds max. If there is no change on the LCD or the LED does not blink, adjust the DNFT back in 1/16" increments. Correct adjustment of the DNFT is confirmed by number change on the LCD or the LED blinking.
7. All conduit and connections should be appropriate for area classification. Notice: Conduit and fittings must be supported to avoid bending magnet housing.
8. After installing magnet assembly and pre-compressor start-up, it is absolutely necessary to purge all air from divider block lubrication system. This can easily be accomplished with a lubrication system purge gun.
9. DNFT must be installed with correct magnet assembly for each divider valve manufacturer. Lincoln-7/16"-20 extended nose with O- ring Dropsa Trabon-1994 or earlier 7/16"-20 with metal crush gasket Trabon-1995 and later 7/16"-20 with O-ring
Programming Modes Available:
MODE 1- Displays Total Divider Valve Cycles. Program Alarm Time in Seconds. MAX: 255 Sec. (4 Min. 15 Sec.) MIN: 20 Seconds
MODE 2 - Displays Cycle Time of Divider Valve in Seconds
MODE 3 - Displays Total Pints. Program Divider Valve Total: Maximum of 120
MODE 4 - Displays Pump Rate in Pints Per Day
To program the DNFT, the programming magnet must be inserted into the 1/8" recessed opening located on the face of the DNFT. To change programming mode, remove and re-insert the programming magnet into the recessed opening. The current programming mode 1,2,3 or 4 will immediately be displayed followed by a "0" 2 seconds later. This "0" indicates that the current mode may be programmed.
NOTICE: DNFT MUST BE PROGRAMMED BEFORE INSTALLATION ON DIVIDER BLOCK.
Mode 1 - LCD Displays Total Divider Valve Cycles. Program Alarm Time MAX: 4 Minutes 15 Seconds (255 seconds)MIN: 20 Seconds
Insert programming magnet into the 1/8" recessed opening located on the face of the DNFT. If mode 1 is not selected in display, remove and reinsert programming magnet until the LCD indicates mode 1. Do not remove programming magnet when mode 1 is displayed. To set alarm time, depress and release spring loaded magnet assembly until desired alarm time (in seconds) is displayed on the LCD. Example: 60 counts on LCD =60 second alarm time. Remove programming magnet. DNFT will display total divider valve cycles if left in this mode and is now set for 60 Mode 2 - LCD Displays Cycle Time of Divider Valve in Seconds. LCD will count each cycle of the divider valve in seconds, counting
up from "0" until the divider valve completes one full cycle. When divider valve completes one full cycle, the LCD will reset to zero and begin counting each second until another cycle is completed.
Mode 3 - LCD Displays Total Pints Used. Program Divider Valve Total in This Mode. MAXIMUM DIVIDER VALVE TOTAL: 120 Insert programming magnet into 1/8" recessed opening located on the face of the DNFT. If mode 3 is not selected in display, remove and reinsert programming magnet until the LCD indicates mode 3. Do not remove programming magnet when mode 3 is displayed. To program divider valve total, add the total of the divider valve assembly on which the DNFT will be installed. Example: 24 + 24 + 24 = 72. Enter the total of the divider valve assembly by depressing and releasing the spring loaded magnet until the divider valve total is displayed on the LCD. When the total of the divider valve assembly is displayed, remove the programming magnet. The DNFT is now programmed and will record total pints on the LCD if left in mode3. The LED blinks in all modes to indicate each divider valve cycle. This blink enables the operator to set pump rate.
Mode 4 - LCD Displays Pump Rate in Pints Per Day . FOUR (4) SECOND MINIMUM CYCLE TIME.
CAUTION: DO NOT INSERT PROGRAMMING MAGNET IN THE RECESSED OPENING WHEN THE UNIT IS MOUNTED ON DIVIDER VALVE WITH COMPRESSOR RUNNING. DNFT WILL GO INTO ALARM AND COMPRESSOR WILL SHUTDOWN. MODES CANNOT BE CHANGED WHILE DNFT IS MOUNTED ON DIVIDER VALVE WITH COMPRESSOR RUNNING.
DNFT must be removed from the divider valve to change modes. After removing DNFT from divider valve, operator may change to any mode by inserting and removing programming magnet until desired mode is displayed by LCD. Please Note: DNFT will store all programmed information until programming magnet is inserted and spring loaded magnet is depressed. If spring loaded magnet is depressed with programming magnet in place, unit defaults to zero and must be reprogrammed.
DNFT BATTERY REPLACEMENT INSTRUCTIONS
1. Shut down the engine or set the bypass timer.
2. Use a 3/8" ratchet to remove the 1/2" NPT Pipe plug.
3. Remove the battery from the DNFT and disconnect from the polarized connector.
4. Connect the new battery to the attached polarized plug.
5. Reinsert the battery and reinstall 1/2" NPT Pipe plug.
6. Verify the DNFT is working by pre-lubing the system and check for LED blink.
ITEMS REQUIRED FOR REPLACING THE DNFT BATTERY:
(1) P/N: 000505 BATTERY or RADIO SHACK P/N: 960-0418 (alternate replacement)
(1) 3/8“ RATCHET WRENCH (for removal of battery plug)
