Delta Electronics AC Motor Drive VFD-EL - Manual (Page 154)

Chapter 5 Troubleshooting|
Revision August 2008, 2ELE, V1.02 5-3
5.4 Low Voltage (Lv)
Low voltage
Is input power cor rect? O r power cut,
including momentary power loss 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
Make nec essary cor rections,
such as change power supply
sy stem for requirement
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
Suitable
transformer power
capacity
Check if voltage between +/B1
and - is greater than
200VDC (for 115V/230V models)
400VDC (for 460V models)
Maybe AC motor drive has m al function.
Please contact DELTA.
Contr ol c ircuit has malfunction or
misoper ation due to noise. P leas e
contact DELTA.
Yes