PowerFlex VFD Fault F013 — Ground Fault

PowerFlex drive detected current leakage to ground on the motor output circuit. Drive tripped to prevent damage to motor, cabling, and drive output electronics.

Probable Causes (ranked)

• Motor cable insulation damage — pinched at conduit entry, abraded by sharp edge, or rodent damage
• Moisture in motor terminal box — condensation, water ingress through failed cable gland or seal
• Motor winding insulation breakdown to frame — age, overheating, or chemical exposure degraded insulation
• Long motor cable run (>100 ft) causing capacitive leakage current that triggers ground fault detection
• VFD output dV/dt (voltage rate-of-rise) charging cable capacitance on long runs

Fix Steps

1. 1 Disconnect motor leads at drive output — megger each phase to ground, all should read over 1 Megohm
2. 2 If motor passes, megger the cable separately — disconnect motor end too and test cable insulation
3. 3 Open motor terminal box — inspect for moisture, corrosion, or water pooling, dry and reseal
4. 4 Inspect entire cable run for physical damage — especially at conduit entry points and sharp bends
5. 5 For long cable runs (>100 ft), add an output line reactor or dV/dt filter between drive and motor
6. 6 Seal all cable glands and conduit entries with appropriate sealant to prevent moisture ingress

Suggested Replacement Parts

Parts matched to fault category: Vfd Drive

Prices are estimates. Verify part numbers match your equipment before ordering.

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