Earth leakage

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An earth (ground) fault or significant current unbalance has been detected in the motor circuit, specifically within the motor itself or its connecting cables. This is a critical safety hazard and can cause severe damage to equipment or pose a risk of electric shock.

• Insulation breakdown in motor winding or motor cable due to age, moisture ingress, or mechanical abrasion, causing current to flow to ground.
• Water or conductive contamination inside the motor terminal box or drive output compartment, creating a low-resistance path to ground.
• Incorrect motor cable shielding termination, allowing induced currents to flow through the ground path.
• Damage to the motor cable conduit or glands compromising earth continuity and allowing leakage.
• Faulty motor bearing (e.g., current discharge through bearings) causing high frequency leakage current.

Klikk på steg for å spore fremgangen.

1. 1

   De-energize the drive. Disconnect the motor cable from the drive output terminals (U, V, W, PE).

2. 2

   Measure insulation resistance of each motor cable conductor to ground (PE) and between conductors using a megohmmeter (1000V).

3. 3

   Measure insulation resistance of each motor winding to ground (motor frame) and between phases using a megohmmeter (1000V).

4. 4

   Visually inspect the motor terminal box, motor cable glands, and cable routing for signs of moisture, damage, or contamination.

5. 5

   Verify the integrity of the motor frame grounding connection to the central earthing point.