A791

Brake resistor fault

ABB · ACS580 General Purpose Drive

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.

Additional Steps

Steps 1–2 are listed in Priority Fix.

  1. 3

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

Source: ABB ACS580 General Purpose Drive
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