Brake resistor fault

What does A791 mean?

A general fault has been detected within the brake resistor circuit. This may indicate an open circuit, incorrect resistance, or an inability to dissipate regenerative energy, which could lead to DC link overvoltage and a drive trip.

Complete Troubleshooting Guide

1. 1

   Perform a visual inspection of the brake resistor for signs of damage or overheating.

2. 2

   Measure the resistance of the brake resistor and compare it to specifications.

3. 3

   Check all wiring connections to the brake resistor for integrity and secure termination.