7
7-5
Fault
Name
Fault Descriptions
Corrective Actions
U-phase error
W-phase error
Return to the factory.
Phase Loss Check input phase wiring for loose contacts.
Software protection failure Return to the factory.
PID feedback signal error
1. Check parameter settings (Pr.116) and
AVI/ACI wiring.
2. Check for possible fault between system
response time and the PID feedback signal
detection time (Pr.123)
B550 Series sensorless vector frequency drive
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