Caterpillar — Reverse VAR Condition - Troubleshoot

Testing & diagnosis · Cat Digital Voltage Regulator (CDVR)

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

Browse Caterpillar generators & specs →

Procedure

1. Operate the generator in Stand-Alone mode.
2. Start CDVR PC software, establish communication, go to the Metering screen.
3. Apply a small reactive load.
4. Check the kWatts and Kvar values in the Metering screen.
5. If both kWatts and Kvar are negative, check CT wiring or reversed A/C sensing leads (terminals P12-10, P12-11, P12-12 = C-B-A).
6. If only one of kWatts/Kvar is negative, check for reversed A/B or B/C sensing leads.

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.

More Caterpillar repair guides →