Automatic Motor Tuning Faulty Motor Phase

What does 52 mean?

During Automatic Motor Tuning (AMT), the drive detected that the motor current in at least one of the motor phases is too low. This could be caused by an open circuit in a motor phase, a loose connection, a damaged motor winding, or a problem with the current measurement circuit. This prevents successful motor characterization.

• An open circuit in one of the motor windings (U, V, or W phase) preventing current flow during tuning.
• Loose or corroded connection at the motor terminal box or the drive's output terminals (U, V, W).
• Broken or damaged motor cable conductor in one phase, creating an open circuit.
• High resistance connection in one motor phase, causing an imbalance in current during the tuning sequence.

Click steps to track your progress.

1. 1

   1. Disconnect motor cables from the drive and measure the resistance between each phase (U-V, V-W, W-U) at the drive end of the cable. All three should be similar.

2. 2

   2. Perform a megohmmeter test on each motor phase to ground and between phases to check for insulation breakdown.

3. 3

   3. Verify all motor cable connections are tight and secure at both the drive's output terminals (U, V, W) and the motor's terminal box.

4. 4

   4. Visually inspect the motor cable for any signs of physical damage, cuts, or pinched areas along its entire length.

5. 5

   5. If cable and connections are verified, disconnect the cable from the motor and measure the motor winding resistance directly at the motor terminals.