Cause : Precharge Error comes when the precharge function has failed to complete within 30 seconds of the precharge request.

A precharge request is initiated when the DC Bus voltage is above the Undervoltage Trip level and the precharge input is high (the requirement for the precharge being high can be bypassed by setting parameter 838 [DigIn 1 Sel] to a value other than 14 “PreChrg/Disc”).