42

Brake resistor overtemperature

Vacon · NX Liquid-Cooled Drive

What does 42 mean?

Overtemperature has been detected in the brake resistor. Subcodes S1-S5 (BCU related) specify the issue: S1 (Internal brake chopper overtemp), S2 (Brake resistance too high), S3 (Brake resistance too low), S4 (Brake resistance not detected), or S5 (Brake resistance leakage/earth fault).

Additional Steps

Steps 1–2 are listed in Priority Fix.

  1. 3

    Verify the dimensioning of the brake chopper and external brake resistor for the application's braking requirements.

  2. 4

    If an internal brake chopper overtemperature (S1) is the cause, consider implementing or replacing with an external brake resistor system.

Source: Vacon NX Liquid-Cooled Drive
Open Manual (Page 155)