Generac RN100 — Generator Voltage Checks
Testing & diagnosis · generator output
For the Generac RN100, from the Generac service manual.
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Before you start
- Generator output voltage present; contact causes fatal shock
Procedure
- Set AUTO/OFF/MANUAL to MANUAL
- Generator cranks and starts
- Warm up at no-load for 5 minutes
- Set main circuit breaker ON
- Check no-load voltage with AC voltmeter
- Measure E1-E2, E2-E3, E1-E3
- Measure E1-NEUTRAL, E2-NEUTRAL, E3-NEUTRAL
- Verify frequency 60-62 Hz
- Verify phase rotation
- Turn OFF utility supply
- Set main circuit breaker OFF
- Set AUTO/OFF/MANUAL to OFF
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Frequency: 60-62 Hz
- 208/480V phase-to-phase: 208-212V or 470-485V
- 120/277V phase-to-neutral: 120-122V or 272-282V
Source: Generac 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.