Caterpillar VR6 — Voltage Adjustment Range - Calibrate
Adjustments · VR6 voltage regulator
For the Caterpillar VR6, from the Caterpillar service manual.
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Before you start
- Do not operate generator at a voltage greater than 5% above the name plate rating.
Procedure
- Remove the seal from the factory calibration adjustment.
- Start the genset.
- Run the genset at no load.
- Turn the factory calibration adjustment fully counterclockwise.
- Turn the voltage adjust rheostat fully clockwise.
- Slowly turn the factory calibration adjustment clockwise until voltage on 20-22-24 is 252 ± 1 VAC for 60 Hz (226 ± 1 VAC for 50 Hz).
- Turn the voltage adjust rheostat counterclockwise.
- Verify that voltage on 20-22-24 is between 156 VAC and 180 VAC. The unit is calibrated.
- Seal the factory calibration adjustment.
Specs & values
- 60 Hz: 252 ± 1 VAC on terminals 20-22-24
- 50 Hz: 226 ± 1 VAC on terminals 20-22-24
- Calibrated check: 156 VAC to 180 VAC on terminals 20-22-24
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.