Ext TH relay oper

What does E.OHT mean?

The inverter output is shut off because an external thermal relay (for motor overheat protection) or an internally mounted motor thermal relay has activated (contacts open). This protective shutdown prevents motor damage from excessive temperature, and is active when '7' (OH signal) is assigned to Pr.178-Pr.184.

Complete Troubleshooting Guide

1. 1

   Check for motor overheating; reduce the load and/or operation duty if necessary.

2. 2

   Verify that the OH signal (value '7') is correctly assigned to one of the input terminal function selection parameters (Pr.178 to Pr.184).

3. 3

   Reset the inverter after the thermal relay contacts close; the inverter will not restart automatically until reset.