Low Voltage (Lv) - Delta Electronics VFD-DD Series User Manual

5-4 Low Voltage (Lv)

Low voltage
Power cut, including momentary
power l os s
Check if there i s any malfunction
component or disconnection
power s upply c ircuit
Check if voltage is
within speci fic ati on
Check if there i s heavy load
with high s tar t cur rent in the
same power sy stem
Check if Lv occurs when
breaker and magnetic
contactor is O N
Check if voltage between +1/+2
and - is greater than Pr.06-00
Contr ol c ircuit has malfunction or
misoper ation due to noise. P leas e
contact DELT A.
Yes
No
Yes
i n
No
No
Yes
Yes
No
Yes
No
No
Yes
5-5
Chapter 5 Troubleshooting |DD Series
Restart after r eset
Change defec tiv e component
and chec k c onnection
Change power supply
sy stem for requirement
Using the di fferent power
supply for this driv e and
heavy load sy stem
Suitable power
transformer capacity
Yes
Maybe AC motor dr ive has malfunction.
Please contact DELTA .
No