Output fault

What does A00523 mean?

This alarm indicates that one phase of the inverter's output is disconnected, suggesting a break in the power path to the motor. This condition can lead to motor malfunction, reduced performance, or potential damage if operated under unbalanced conditions.

• Disconnection or high resistance in one of the motor phases (U, V, W) between the inverter output terminals and the motor.
• Internal power semiconductor (IGBT) failure or damage in one phase of the inverter bridge.
• Motor winding open circuit or inter-turn short in one phase, causing an imbalanced load detected by the drive.
• Faulty motor cable or terminal connection, resulting in a loss of connection to one phase at the drive or motor side.
• Incorrect motor parameterization (e.g., P0304 - motor rated current) leading to an inability for the drive to detect the motor properly.

Click steps to track your progress.

1. 1

   1. De-energize the drive and measure the resistance of each motor phase (U-V, V-W, W-U) at the motor terminals; compare readings to specifications.

2. 2

   2. With power off, check all output cable connections for the motor (U, V, W) at both the inverter terminals and the motor terminal box for tightness and corrosion.

3. 3

   3. Measure the insulation resistance of each motor phase to ground and between phases using a megohmmeter (e.g., 500VDC or 1000VDC test voltage).

4. 4

   4. Verify the motor parameters (e.g., P0304, P0305, P0307, P0310) configured in the drive match the motor nameplate data exactly.

5. 5

   5. If using an output filter or reactor, inspect its connections and internal integrity for any signs of damage or open circuits.

6. 6

   6. Observe drive current output (e.g., r0027) on each phase using a clamp meter during a low-speed run to detect current imbalance.