Low Voltage Lv - Delta VFD-VJ Series User Manual

5-5 Low Voltage (Lv)
If there is power outage (including
momentary blackout)
Any broken devices or
bad connection in the
If voltage of power supply
is within regulated range
Any load in the same power
supply system that has larger
load of starting current
If Lv occurs when the circuit
breaker and electromagnetic
contactor are ON
It's likely hybrid servo controller breaks
down or malfunctions due to noise.
Please contact Delta for assistance.
Lv
Low voltage
No
Yes
supply circuit
No
No
Yes
No
Yes
No
VFD-VJ Air Cooled | 5. Methods of Anomaly Diagnosis
Yes
Reset and
restart
Replace broken components
and correct connection
Modify power supply system to
comply with the regulations
If the capacity of power supply
transformer is appropriate
5-17
No
Yes