Delta 1.07 VFD-D D - Manual (Page 110)

Chapter 5 Troubleshooting |DD Series
5-5
5-4 Low Voltage (Lv)
Low voltage
Power cut, including momentary
power l os s Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
Restart after r eset
Check if there i s any malfunction
component
i n
power s upply c ircuit
or disconnection
Change defec tiv e component
and chec k c onnection
Check if voltage is
within speci fic ati on
Change power supply
sy stem for requirement
Check if there i s heavy load
with high s tart current in the
same power sy stem
Check if Lv occurs when
breaker and magnetic
contactor is ON
Suitable
transformer power
capacity
Check if voltage between +1/+2
and - is greater than Pr.06-00
Maybe AC motor drive has malfunction.
Please contact DELTA .
Control c ircuit has malfunction or
misoperation due to noise. P leas e
contact DELTA.
Yes Using the di fferent power
supply for this driv e and
heavy load sy stem