FLOOR-STANDING SWITCHGEAR Caterpillar

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The bus bars and current transformer will have high voltage when the generator is in operation with the circuit breaker in the switchgear, closed. If the installation has more than one switchgear, and the other generators are in operation, the bus bars can have high voltage with the circuit breaker in the switchgear open. Be very careful when troubleshooting for voltage in the switchgear.

All of the tests in the verification procedures can be made with a multi-tester (volt ohmmeter). A phase rotation meter is necessary for some tests.

Before any tests are made, be sure you understand the operation of the components and their locations in the wiring diagrams. Most of the voltage tests are for 120 volts so be very careful when the tests for 120 volts are made.

Problems

1. VOLTMETER HAS NO INDICATION.

2. FREQUENCY METER EITHER SHOWS NO INDICATION OR IT IS WRONG.

3. HOURMETER (ON PANEL) DOES NOT OPERATE.

4. POWERFACTOR METER INDICATION IS WRONG.

5. REVERSE POWER RELAY DOES NOT OPERATE CORRECTLY.

6. WATTMETER INDICATION IS WRONG.

7. WATTHOUR METER DISC EITHER TURNS COUNTERCLOCKWISE OR DOES NOT TURN.

8. AMMETER HAS NO INDICATION.

9. ENGINES WITH 2301 GOVERNORS WILL NOT SHARE THE LOAD.

10. SYNCHRONIZING LIGHTS DO NOT OPERATE.

11. SYNCHROSCOPE HAS NO INDICATION.

12. BREAKER CONTROL SWITCH WILL NOT CLOSE CIRCUIT BREAKER WHEN READY TO CLOSE LIGHT IS ON.

13. CIRCUIT BREAKER DOES NOT CLOSE, READY TO CLOSE LIGHT WILL NOT GO ON.

14. MOTOR TO OPERATE CIRCUIT BREAKER DOES NOT OPERATE.

15. CIRCUIT BREAKER WILL CLOSE ON A DEAD BUS BUT WILL NOT CLOSE ON A LIVE (ACTIVATED) BUS.

Voltmeter Has No Indication.

Frequency Meter Either Shows No Indication Or It Is Wrong.

Hourmeter (On Panel) Does Not Operate.

Power Factor Meter Indication Is Wrong.

Reverse Power Relay Does Not Operate Correctly.

Wattmeter Indication Is Wrong.

Watthour Meter Disc Either Turns Counterclockwise Or Does Not Turn.

Ammeter Has No Indication.

Engines With 2301 Governors Will Not Share The Load.

Synchronizing Lights Do Not Operate.

Synchroscope Has No Indication.

Breaker Control Switch Will Not Close Circuit Breaker When Ready To Close Light Is On.

Circuit Breaker Does Not Close, Ready To Close Light Does Not Go On.

Motor To Operate Circuit Breaker Does Not Operate.

Circuit Breaker Will Close On A Dead Bus But Will Not Close On A Live (Activated) Bus.