Chapter 5 Troubleshooting
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5-3
5.4 Low Voltage (Lv)
Low voltage
Is input power cor rect? O r power cut,
including momentary pow er loss
Yes
Yes
Yes
Yes
Yes
Yes
N o
N o
N o
N o
N o
N o
N o
R estart after r eset
C heck if there i s any malfunction
component i n
pow er s upply c ircuit
or disconnection
C hange defec tiv e component
and chec k c onnection
C heck if voltage is
w ithin speci fic ati on
Make nec essary cor rections,
such as change power supply
sy stem for requirement
C heck if there i s heavy load
w ith high s tar t cur rent in the
same pow er sy stem
C heck if Lv occurs w hen
breaker and magnetic
contactor is O N
Suitable
transformer
pow er
capacity
C heck if voltage betw een +/B1
and - is greater than
200VD C (for 115V/230V models)
400VD C (for 460V models)
Maybe AC motor drive has m al function.
Please contact D ELTA.
C ontr ol c ircuit has malfunction or
misoper ation due to noise. P leas e
contact D ELTA.
Yes
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