PTC Motor Overtemperature

What does OH3 mean?

The motor's PTC (Positive Temperature Coefficient) thermistor has detected an overtemperature condition within the motor, indicating it is too hot due to excessive currents, frequent, or prolonged accelerations. Alternatively, this fault can occur if the PTC sensor is not properly connected or its monitoring is not correctly configured. High motor temperatures can damage insulation and reduce motor lifespan.

Complete Troubleshooting Guide

1. 1

   Verify the drive and motor selection are suitable for the application's duty cycle and current demands, addressing any underlying causes of motor overheating.

2. 2

   Ensure the PTC thermistor is correctly wired and securely connected to the drive's PTC input terminals.

3. 3

   If PTC monitoring is not desired or the sensor is not used, set parameter C0585 to '3' to disable this monitoring function.