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SUPPORT AS 2277973 - Caterpillar



2277973 SUPPORT AS Caterpillar parts SUPPORT
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Alternative (cross code) number:
CA2277973
227-7973
2277973
Caterpillar 2277973 SUPPORT AS

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Calibrating The In-Phase Monitor Circuit Board
In-Phase Monitor Circuit BoardFor proper operation, the In-Phase Monitor circuit board should be calibrated to the existing STANDBY and UTILITY source voltages. The In-Phase Monitor circuit board should be calibrated when the transfer switch has been installed as part of an operating system. Also, replacement circuit boards should be calibrated after installation.To calibrate the circuit board, two adjustment potentiometers (R102 and R107) are provided in the lower left corner of the circuit board. Always calibrate the circuit board in the following sequence:1. Check that the UTILITY supply voltage is available to the system.2. Start the generator set. Allow it to stabilize and warm up. The Standby Run Signal LED should be ON.3. Place the calibration mode switch in the STDBY position. Observe the four top red LED's on the circuit board (Warmup Timer, Minimum Run Timer, Return to Utility Timer and Cooldown Timer). * If the two upper LED's are flashing, calibration is set too low.* If the two bottom LED's are flashing, calibration is set too high.4. On the circuit board, adjust potentiometer R102 until only the Minimum Run LED and the Return To Utility LED (two center LED's of the top four red LED's) are flashing.5. Place the calibration mode switch to the UTIL position. Observe the four upper LED's on the circuit board.6. Adjust potentiometer R107 until only the Minimum Run LED and Return To Utility LED (two center LED's of the top four red LED's) are flashing.7. Place the calibration mode switch to the OFF position. The In-Phase Monitor circuit board is now calibrated. With the calibration mode switch in the STDBY or UTIL positions, the top four LED's should turn ON in sequence. That is, the LED's should sweep ON and OFF, from one LED to the next. Calibration is obtained when the Minimum Run LED and Return To Utility LED (two center LED's of the top four red LED's) are flashing.Setting The In-Phase Monitor Circuit Board
SW1 On In-Phase Monitor Circuit BoardThe In-Phase Monitor circuit board must be set to match the type of the transfer switch on which it is installed. At the factory, the circuit board is set up to match the transfer switch and should require no additional configuring.However, for units that are not installed at the factory, the circuit board must be set up to match the type of the transfer switch on which it is being installed. An improper setting may cause transfers that are out of the 20 degree specification.The SW1 switch on the In-Phase Monitor circuit board is used to set the circuit board to match the transfer switch. SW1 is a DIP (dual inline package) switch assembly consisting of eight miniature switches. The individual switches on SW1 are labeled 1 through 8. SW1 is soldered to the circuit board near the Transfer On Exercise switch. The installer must set the switches 1 through 8 of SW1 as listed in the SW1 Settings chart. Seven Day Exerciser Circuit Board Adjustments
7-Day Exerciser


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