Earth leakage

What does A2B3 mean?

This warning signifies an earth fault or current unbalance detected in the motor or its cable. While initially a warning, a persistent or severe leakage indicates a potential insulation breakdown. If left unresolved, it can escalate to a fault trip (2330), cause equipment damage, or pose safety hazards.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Verify the current balance across the motor phases during operation (if safe to run as a warning).

2. 4

   Review parameter 31.20 Earth fault settings to understand the drive's sensitivity to leakage currents.