PLUG-CUP 4N0932 - Caterpillar

Test Step 1. PERFORM THE INITIAL CHECK
Shut down the generator set. Remove all power to the generator set.Note: If the low voltage condition has been caused by the regulator over-excitation shutdown protection feature, removing regulator power will reset the over excitation protection feature.
Illustration 1 g01021519
The Cat VR6 presents an electrical shock/electrocution hazard. This hazard will cause serious injury or death.Service by trained personnel only.The terminals and heat sinks are live at hazardous voltages when power is applied and for up to 8 minutes after power is removed.
Check for loose terminals.
Check for corroded terminals.
Check for proper connections between the voltage regulator and the generator.Expected Result:All initial checks show no problems.Results:
YES - There are no loose terminals or corroded terminals. The connections are correct. Proceed to test step 2.
NO - One or more of initial checks shows a problem.Repair: Tighten loose terminals. Replace corroded terminals. If the connections are incorrect, connect the wiring properly according to the wiring diagram.STOPTest Step 2. CHECK CONNECTIONS FOR THE VAR/PF CONTROLLER
If the VAR/PF controller is used, verify whether there is no jumper between terminals 2 and 3.
If the VAR/PF controller is not used, place the jumper between terminals 2 and 3.Expected Result:The jumper has been placed accordingly.Results:
YES - The jumper is installed when the VAR/PF controller is not used. There is no jumper between terminals 2 and 3 when the VAR/PF controller is used. Proceed to test step 3.
NO - The connections are not correct.Repair: Place the jumper according to the wiring schematic.STOPTest Step 3. CHECK METERS
If attached, disconnect any PF/VAR controller from the VR6 voltage regulator. Place a jumper across terminals 2 and 3 of the VR6 voltage regulator.
Start the genset.
Run the genset at no load.
Illustration 2 g01021519
The Cat VR6 presents an electrical shock/electrocution hazard. This hazard will cause serious injury or death.Service by trained personnel only.The terminals and heat sinks are live at hazardous voltages when power is applied and for up to 8 minutes after power is removed.
Ensure the accuracy of the voltmeter. If you are reading the voltage from the control panel, check that voltage with a multimeter.Note: Take the voltage readings on terminals 20 and 22 at the regulator. Also take voltage readings on terminal 24 if 3 phase sensing is used.Expected Result:Meters are accurate.Results:
YES - Meter readings are accurate. Proceed to test step 4.
NO - The meter readings do not match.Repair: Troubleshoot the metering circuit. Verify the schematic for the metering circuit. Verify whether the meters are connected correctly.STOPTest Step 4. CHECK CONNECTIONS OF THE VOLTAGE ADJUST POTENTIOMETER
Turn off the genset.
Illustration 3 g01021519
The Cat VR6 presents an electrical shock/electrocution hazard. This hazard will cause serious injury or death.Service by trained personnel only.The terminals and heat sinks are live at hazardous voltages when power is applied and for up to 8 minutes after power is removed.
Check if there is the jumper between terminals 4 and 7.Expected Result:There is a jumper that is placed between terminals 4 and 7.Results:
YES - If a remote voltage adjust potentiometer is NOT used, the jumper is