OC2

Hva betyr 012 ?

One of the motor phases has made contact with earth (ground), indicating an earth fault. This suggests an insulation breakdown in the motor cable or the motor windings.

• Insulation breakdown in the motor cable due to mechanical stress (chafing, crushing) or chemical/moisture ingress.
• Internal short circuit or insulation failure within motor windings, often caused by overheating, contamination, or age.
• Improper grounding of the motor frame or drive enclosure, creating an unintended current path to earth.
• Accumulation of conductive dust, metal particles, or moisture on motor terminals or inside the terminal box, bridging phases to ground.

Klikk på steg for å spore fremgangen.

1. 1

   1. Disconnect the motor power cables (U, V, W) from the drive's output terminals.

2. 2

   2. Using a megohmmeter (insulation resistance tester), measure insulation resistance between each motor phase (U, V, W) and the motor frame ground terminal. A reading below 1 Megohm (1MΩ) indicates a fault.

3. 3

   3. If motor insulation is good, measure insulation resistance between each conductor of the motor cable and the cable shield/earth conductor.

4. 4

   4. Visually inspect the motor cable along its entire length for signs of damage (cuts, abrasions, crushing) and check the motor terminal box for moisture or debris.

5. 5

   5. If a cable or motor winding fault is confirmed, isolate the faulty component for repair or replacement.