Over Voltage Ov; Low Voltage Lv - Delta VFD-VJ Series User Manual

5-4 Over Voltage ov

5-5 Low Voltage Lv

If there is power outage (including
Any load in the same power
supply system that has larger
If Lv occurs when the circuit
breaker and electromagnetic
It's likely hybrid servo drive breaks down
or malfunctions due to noise. Please
contact Delta for assistance.
Lower voltage of power
supply within the upper
limit
It's likely hybrid servo drive
breaks down or malfunctions
due to noise. Please contact
Delta for assistance.
Lv
Low voltage
momentary blackout)
No
Any broken devices or
bad connection in the
supply circuit
No
If voltage of power supply
is within regulated range
Yes
load of starting current
No
Yes
contactor are ON
No
OV: Over voltage
Check if voltage of
No
power supply is within
the regulated range
If the voltage of DC BUS
No
exceeds the protection value in
implementing brake
Yes
Reset and
restart
Yes
Replace broken components
and correct connection
No
Modify power supply system to
comply with the regulations
If the capacity of power supply
transformer is appropriate
5-9
5. Fault Diagnostic Methods
Yes
action
Yes
Consider
unit
No
Yes