Motor Overtemperature (PTC Warning)

What does OH51 mean?

The motor's PTC thermistor has detected an overtemperature condition, triggering a WARNING (not a TRIP). This typically occurs when the motor operates under impermissible high currents or frequent/long acceleration processes, or if the PTC sensor is not connected while monitoring is active (C0119 = 2 or 5). While a warning, continued operation can still lead to motor damage if the condition escalates.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   If no PTC is used and monitoring is not desired, switch off PTC monitoring via parameter C0119.