Electronic thermal relay function pre-alarm

Electronic Thermal Relay Function Pre-alarm

Mitsubishi · FR-D700 Inverter (Basic)

What does Electronic thermal relay function pre-alarm mean?

The cumulative value of the electronic thermal O/L (overload) relay has reached 85% or higher of the Pr. 9 Electronic thermal O/L relay setting. This warning signifies that the motor or inverter is approaching an overload condition based on its thermal model. Continued operation without reducing the load could lead to an overload trip.

Complete Troubleshooting Guide

  1. 1

    Reduce the load on the motor and decrease the frequency of operation to allow for cooling.

  2. 2

    Set an appropriate value in Pr. 9 Electronic thermal O/L relay, ensuring it accurately matches the motor's thermal characteristics and rated current.

Source: Mitsubishi Manual