TURBOCHARGER GP 1873578 - Caterpillar

The digital voltage regulator (DVR) is a microprocessor-based voltage regulator. The parameters are preset at the factory or the parameters can be modified to meet the specific requirements on the site. Certain system parameters can also be monitored on the display (5) of the DVR. Keypad (9) is used to change the information that is shown on the display (5). J1 connector (10) is used to join the DVR to a personal computer. Screw terminals (11) are used to join the DVR to the generator and various customer options.Adjustment Procedure for the Voltage Regulators
VR3 Regulator
Note: The VR3 regulator is protected by a fuse or fuses. The VR3 regulator also has a solid-state overcurrent protection. If a fuse becomes open, contact a Caterpillar dealer.
Remove the access panel of the generator.
Loosen the locknut on the voltage droop potentiometer (1). Remove the protective screw from the voltage level potentiometer (2). Remove the protective screw from the voltage gain potentiometer (3).
Turn the voltage droop potentiometer (1) counterclockwise to zero droop. Tighten the locknut. The Voltage droop potentiometer (1) is located next to the regulator.
Remove the protective screw from the voltage level potentiometer (2). Remove the protective screw from the voltage gain potentiometer (3).
Turn the voltage gain potentiometer (3) counterclockwise to zero. Then, turn voltage gain potentiometer (3) to about 1/4 of full range of clockwise travel.
Perform required maintenance on the engine before you start the engine.
Start the engine. Allow the engine to warm up. Refer to the Safety Section, "Engine Starting".
Increase engine speed to full governed rated speed (high idle).
Observe the voltmeter reading. If the desired voltage is