7.7 Display of PU01 is Abnormal

Abnormal display or no display

Yes

Cycle power to AC motor drive

Display normal?

No

Yes

AC motor drive works normally

Chapter 7 Troubleshooting |VFD-B Series

Fix connector and eliminate noise

No

Check if all connectors are connect

correctly and no noise is present

Yes

AC motor drive has malfunction.

Please contact DELTA.

7.8 Phase Loss (PHL)

Phase loss

Check wiring at R, S and T terminals

No

Correct wiring

Yes

No

Check if the screws of terminals are tightened

Tighten all screws

Yes

Yes

Check if the input voltage of R, S, T is unbalanced

No

Please check the wiring

and power system for

abnormal power

Maybe AC motor drive has malfunction or misoperation

due to noise. Please contact DELTA.

Revision July 2008, BE16, SW V4.08 & V5.00

7-5