R-Pro › Field cases › Refrigeration systems
Immediate Trip Due to Ground Fault (Insulation Breakdown)
Likely causes
Insulation breakdown between motor winding and casing
Check: Fully disconnect power and apply LOTO
What to do: Fully disconnect power and apply LOTO → Measure insulation resistance of each component against ground (500V DC; must be ≥1MΩ) → Identify the faulty component → Replace faulty wiring or component → Re-measure insulation resistance to confirm ≥1MΩ → Verify breaker rating before re-energizing
Ground fault from damaged wire insulation
Check: Measure insulation resistance of each component against ground (500V DC; must be ≥1MΩ)
What to do: Measure insulation resistance of each component against ground (500V DC; must be ≥1MΩ) → Identify the faulty component → Replace faulty wiring or component → Re-measure insulation resistance to confirm ≥1MΩ → Verify breaker rating before re-energizing
Insulation failure in control board or components
Check: Identify the faulty component
What to do: Identify the faulty component → Replace faulty wiring or component → Re-measure insulation resistance to confirm ≥1MΩ → Verify breaker rating before re-energizing
A ground fault has occurred in wiring or motor. Measure insulation resistance to identify and replace the faulty component. Energizing a ground-faulted circuit risks fatal electric shock. Always confirm insulation resistance before re-energizing.
All 565 cases work offline in R-Pro, with error codes for 62 brands and P-T data for 108 refrigerants.
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