AB 2 fault code meaning

Series: PowerFlex 700S Phase II

Vref Decel Fail

AC drive

Meaning: The value of Par 301 [Motor Spd Ref] has failed to decrease during a ramp to zero speed stop. This could possibly be due to a speed trim from Par 21 [Speed Trim 1], Par 22 [Speed Trim 2] or Par 23 [Speed Trim 3].

Possible causes

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