Chapter 7 Troubleshooting VFD-S Series

7.4 Low Voltage (Lv)

Low voltage

Is input power correct? Or power cut, Yes

including momentary power loss

 

 

 

 

 

 

 

 

Restart after reset

 

 

 

 

 

 

 

 

 

 

 

 

No

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Check if there is any malfunction

Yes

 

 

 

 

 

 

 

 

 

Change defective component

 

component or disconnection in

 

 

 

 

 

 

 

 

and check connection

 

 

 

 

 

 

 

 

 

 

power supply circuit

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Check if voltage is

 

No

 

 

 

 

Make necessary corrections,

 

 

 

 

 

such as change power supply

within specification

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

system for requirement

 

 

 

 

 

 

 

 

 

 

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Check if there is heavy load

 

Yes

 

 

 

 

Using the different power

 

 

with high start current in the

 

 

 

 

 

 

 

supply for this drive and

 

 

 

 

 

 

 

 

 

 

 

same power system

 

 

 

 

 

 

 

 

heavy load system

 

 

 

No

 

 

 

 

 

 

 

 

 

 

No

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Check if Lv occurs when

Yes

 

 

 

 

 

Suitable power

breaker and magnetic

 

 

 

 

 

 

 

 

 

transformer capacity

contactor is ON

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No

Check if voltage between +1/+2

and - is greater thanNo 200VDC (for 230V models) 400VDC (for 460V models)

517VDC (for 575V models)

Yes

Yes

Maybe AC motor drive has malfunction. Please contact DELTA.

Control circuit has malfunction or misoperation due to noise. Please contact DELTA.

Revision August 2006, SE08, SW V2.61

7-3

Page 142
Image 142
Delta Electronics 460V Series, 230V Series, 115V Series manual Low Voltage Lv