Motor Overtemperature (PTC TRIP)

What does OH3 mean?

The motor's PTC thermistor has detected an overtemperature condition, triggering a TRIP fault. This is usually caused by the motor operating under impermissible high currents or frequent/long acceleration processes, or simply if the PTC sensor is not connected while monitoring is active (C0119 = 1 or 4). Continued motor operation in an overtemperature state will lead to severe winding damage and premature motor failure.

Complete Troubleshooting Guide

1. 1

   Evaluate the motor and drive dimensioning against the application's load and duty cycle. Reduce load or consider a larger motor/drive if necessary.

2. 2

   Check if the PTC thermistor is correctly connected to the drive's input terminals.

3. 3

   If no PTC is used and monitoring is not desired, switch off PTC monitoring via parameter C0119 (set to 0 or 3).