Earth leakage

What does 2330 mean?

The drive trips on this fault when an earth fault or significant current unbalance is detected in the motor or motor cable. This indicates a severe insulation breakdown or a direct short to ground, posing a risk of equipment damage, electric shock, or fire.

• Direct short circuit from a motor phase (U, V, or W) to the motor frame or ground (PE) within the motor windings.
• Severe damage or complete breakdown of insulation in the motor power cable, causing a direct phase-to-ground short.
• Accumulation of conductive liquids (e.g., water, coolant) inside the motor terminal box or drive output section.
• Failure of the drive's output IGBTs or DC bus components, allowing current to flow to ground internally.
• Incorrect or damaged installation of the output filter (e.g., du/dt filter), causing it to short to ground.

Click steps to track your progress.

1. 1

   1. Disconnect the motor cable from the drive. Perform a comprehensive insulation resistance test (e.g., 1000VDC Megger) on each motor phase cable (U, V, W) to ground (PE).

2. 2

   2. With the motor cable still disconnected from the drive, perform an insulation resistance test on the motor windings (U, V, W to motor frame/ground).

3. 3

   3. Thoroughly inspect the motor terminal box and drive output terminals for any signs of moisture, carbon tracking, or visible short circuits.

4. 4

   4. Visually inspect the entire length of the motor cable for severe mechanical damage, cuts, or crushing that could expose conductors to ground.

5. 5

   5. If the motor and cable test good, disconnect all output filters (if any) and re-test the drive itself for internal earth faults using a specialized test procedure.