Caterpillar — Generator Overcurrent - Troubleshoot

Testing & diagnosis · Cat Digital Voltage Regulator (CDVR)

From a Caterpillar service manual — check it applies to your exact model before use.

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Procedure

1. Verify potential transformers are installed correctly.
2. Check for a difference between sensed voltage and rated voltage from the wye center tap.
3. Verify Rated voltage, PT primary, and PT secondary parameters equal generator rated voltage.
4. Verify field winding inputs to the CDVR are not partially or fully shorted.
5. Check exciter for proper resistance value.
6. Replace the voltage regulator if all prior steps fail to correct the malfunction.

Source: Caterpillar service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.

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