Fieldbus Motor Phase Failure (TRIP)

What does 32 mean?

The drive has detected a motor phase failure and has triggered a TRIP fault, indicated via the fieldbus interface. This means one or more motor phases are inactive or drawing insufficient current. The fault prevents further operation and requires investigation of motor connections or parameters to avoid motor or drive damage.

• Open circuit in one or more motor phase conductors (U, V, W) between the drive output terminals and the motor terminals.
• Internal winding fault (open circuit) within the motor itself for one phase, causing current imbalance.
• Drive output power stage (IGBT module) failure for a specific phase, preventing current flow to the motor.
• Malfunction of the drive's current sensing circuit for one phase, leading to erroneous detection of low or zero current.
• Dislodged or corroded connection at the motor terminal block (e.g., U1, V1, W1).

Click steps to track your progress.

1. 1

   Disconnect power to the drive. Use an ohmmeter to measure resistance between drive output terminals (U, V, W) and the corresponding motor terminals to confirm continuity (should be < 1 Ohm).

2. 2

   With power off, use a multimeter to measure the resistance of each motor winding phase (U-V, V-W, W-U) at the motor terminal block; readings should be balanced within 5%.

3. 3

   Inspect drive output terminals (U, V, W) and motor terminals (U, V, W) for loose connections, corrosion, or signs of overheating and tighten to specified torque.

4. 4

   Bypass the motor cable by connecting a known good motor or a test resistive load to the drive output terminals (U, V, W) and run at low speed to test the drive's output.

5. 5

   Use a clamp meter to measure current on each motor phase (U, V, W) while the drive is attempting to run; an imbalanced or zero current reading on one phase will pinpoint the problem.