Low Voltage (Lv) - Delta Electronics AC Motor Drive VFD-E User Manual

5.4 Low Voltage (Lv)

Is input power correct? Or power cut,
including momentary power loss
Check if there is any malfunction
component or disconnection
power supply circuit
Check if voltage is
within specification
Check if there is heavy load
with high start current in the
same power system
Check if Lv occurs when
breaker and magnetic
contactor is ON
Check if voltage between +/B1
and - is greater than
200VDC (for 115V/230V models)
400VDC (for 460V models)
Control circuit has malfunction or
misoperation due to noise. Please
contact DELTA.
Revision June 2008, 04EE, SW--PW V1.11/CTL V2.11
Low voltage
No
in
No
Yes
No
No
Yes
Yes
Restart after reset
Yes
Change defective component
and check connection
Make necessary corrections,
No
such as change power supply
system for requirement
Using the different power
Yes
supply for this drive and
heavy load system
Yes
Suitable
transformer
No
Maybe AC motor drive has malfunction.
Please contact DELTA.
Chapter 5 Troubleshooting|
No
power
capacity
Yes
5-3