Cause : No armature current is flowing (active in operating states of – –, I, II)

This monitoring function responds if the armature firing angle is at the rectifier stability limit for more than 500 ms and the armature current is less than 1% of the converter rated armature DC current.

Possible fault causes
♦ Armature circuit is open (e.g. DC fuses have blown, open circuit, etc.)
♦ Rectifier stability limit αG (P150) is incorrectly set
♦ Drive is operating at αG limit (e.g. due to supply undervoltage)
♦ EMF is too high because maximum speed setting is too high, refer to P083, P115, P143, P741)
♦ EMF is too high because field weakening is not selected (refer to P082)
♦ EMF is too high because field current is set too high (refer to P102)
♦ EMF is too high because transition speed for field weakening is set too high (refer to P101) ??