Delta 1.07 VFD-D D User Manual download pdf (Page 110)

Chapter 5 Troubleshooting |DD Series

5-5

5-4 Low Voltage (Lv)

Low voltage

Power cut, including momentary

power loss

Yes

Restart after reset

Check if there is any malfunction

component in

power supply circuit

or disconnection

Change defective component

and check connection

Check if voltage is

within speci fic ati on

Change power supply

system for requirement

Check if there is heavy load

with high s tar t cur rent in the

same power system

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 circuit has malfunction or

misoper ation due to noise. P leas e

contact DELTA.

Yes

Using the di fferent power

supply for this drive and

heavy load system

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Delta 1.07 VFD-D D User Manual Page 110