Earth Fault / Current Unbalance

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The drive has detected excessive output current unbalance, typically due to an earth fault in the motor or motor cable. For systems with parallel inverter modules (xx refers to module number 1-12), this may indicate an unbalance across units or an internal fault. This condition poses a risk of electrical shock and equipment damage.

• Ground fault detected, leading to current leakage to earth.
• Significant difference in current between phases (P1, P2, P3) indicating an imbalance.
• Potential insulation failure in motor windings or cabling.
• External leakage path to ground for the electrical current.

Klikk på steg for å spore fremgangen.

1. 1

   Verify there are no power factor correction capacitors or surge absorbers installed in the motor cable circuit.

2. 2

   Measure insulation resistances between phases and ground for both the motor and the motor cable using a megger.

3. 3

   If no external earth fault is detected, contact your local ABB representative for internal fault diagnosis.