Chapter 5 Troubleshooting DD Series

5-4 Low Voltage (Lv)

Low voltage

Power cut, including momentary

 

 

Yes

 

 

Restart after reset

power los s

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Check if there is any malfunction

Yes

 

 

 

 

Change defec tive component

component or disconnection in

 

 

 

 

 

 

 

 

and chec k connection

 

 

 

 

 

 

 

 

power supply circuit

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No

 

 

 

 

 

 

 

Change power supply

Check if voltage is

 

 

 

 

 

 

 

 

within speci ficati on

 

 

 

 

 

 

 

 

 

 

 

sy stem for requirement

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Check if there i s heavy load

Yes Using the di fferent power

 

with high start current in the

 

 

 

 

 

 

supply for this drive and

 

same power sy stem

 

 

 

 

 

 

 

 

heavy load sy stem

 

 

No

 

 

 

 

 

 

 

 

 

 

 

 

 

No

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Check if Lv occurs when

Yes

 

 

 

 

 

 

 

 

 

 

 

 

Suitable power

breaker and magnetic

 

 

 

 

 

 

 

 

 

 

 

transformer capacity

contactor is

ON

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No

 

 

 

 

 

 

 

 

 

 

 

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Check if voltage between +1/+2

 

 

No

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Maybe AC motor drive has malfunction.

and - is greater than Pr.06-00

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Please contact DELTA .

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Yes

Control c ircuit has malfunction or misoperation due to noise. P leas e contact DELTA.

5-5

Page 110
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3Com VFD-D D manual Low Voltage Lv

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