LP1 Motor phase failure

What does x032 mean?

One of the current-carrying motor phases has failed. This monitoring function is primarily for asynchronous motors and requires the MLP1 function block to be entered in C0465. Possible causes include a faulty motor, a damaged motor cable, or a current limit value (C0599) set too low. The monitoring can be switched off via C0597.

• Open circuit in one of the motor phases (U, V, or W) within the motor cable due to a broken conductor or severe mechanical damage.
• Poor or loose connection at the motor terminal block or the drive output terminals (e.g., X2/U, X2/V, X2/W) for one of the phases.
• Internal winding fault or open circuit within the motor itself, leading to one phase becoming disconnected.
• Malfunctioning current sensor or monitoring circuit within the drive for a specific phase, causing a false detection of phase loss.
• Incorrect configuration of parameter C0465, where the MLP1 function block is not properly activated or set for the motor type.

Click steps to track your progress.

1. 1

   Power down the drive and disconnect the motor cable from the drive's output terminals (e.g., X2/U, X2/V, X2/W).

2. 2

   Measure the resistance between each pair of motor phase conductors (U-V, V-W, W-U) at the drive output side of the cable. Expected readings should be similar.

3. 3

   Measure the resistance of each motor winding at the motor terminal block (e.g., U-V, V-W, W-U). All three measurements should be identical for a healthy motor.

4. 4

   Check the tightness and integrity of all connections at the drive's motor output terminals (X2/U, X2/V, X2/W) and the motor terminal block.

5. 5

   Verify parameter C0465 is correctly configured for motor phase monitoring (MLP1) and matches the connected motor type (e.g., asynchronous motor).

6. 6

   Perform an insulation resistance test on the motor windings (each phase to ground) using a megohmmeter to rule out internal winding faults.