What is Pre-charge relay Fault on ATV71 drives.

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The purpose of Pre-charge relay Fault (CRF1) is to check the closing of the pre-charge relay/contactor.This fault appears only for the size 2 to 5B.

Probable causes: -
=>Failure of the command of the pre-charge relay or deterioration of the charge function (resistor).
=>Unstable DC bus voltage.

Remedies: -
=>Change the power section or the power board.
=>Change the control block.
=>Check input voltage.