Low Voltage (Undervoltage) Trip

What does 32 mean?

This fault indicates that the drive has detected an undervoltage condition or power dip, which it could not ride through. Depending on parameter 501 settings (Coast Stop or Controlled Stop), the drive will either coast to a stop or decelerate the motor before faulting. This protects the drive and motor from operation with insufficient input power.

• Input supply voltage dropping below the drive's undervoltage trip threshold (e.g., 340V for a 400V drive) due to utility brownout or heavy load transients.
• Loose or corroded connections on the drive's input power terminals (L1, L2, L3) causing voltage drop under load.
• Insufficient power supply transformer sizing for the connected load, leading to significant voltage sag.
• Rapid and prolonged acceleration of a high inertia load, draining the DC bus faster than the input can replenish it if ride-through is disabled (P5-01 set to Coast Stop).

Click steps to track your progress.

1. 1

   1. Measure input line voltage (L1-L2, L2-L3, L3-L1) at the drive's input terminals using a true RMS multimeter during normal operation and during fault conditions.

2. 2

   2. Verify all input power cabling and terminal connections for looseness or corrosion, especially at the main disconnect switch and drive input terminals.

3. 3

   3. Review the grid stability and load profile of the facility; consider installing a UPS or input line reactor if voltage dips are frequent.

4. 4

   4. Adjust undervoltage ride-through settings if available (e.g., P5-01 to Controlled Stop or Auto-Restart) to attempt to ride through short voltage sags.

5. 5

   5. Confirm the input voltage measured matches the drive's specified nominal input voltage range.