Chapter 7 Troubleshooting _VFD-B Series
Revision 10/2005, BE13, SW V4.08 7-5
7.7 Display of PU01 is Abnormal
Abnormal display or no display
Turn the power off and power
on again after display is off
No
Yes
Yes
Yes
No
Display normal?
AC motor drive works normally
Fix connector and eliminate noise
Check if all connectors are connected
well and if there is no noise
AC motor drive has malfunction.
Please contact with DELTA.
7.8 Phase Loss (PHL)
Phase loss
No
No
Yes
Yes
Check if the wiring of terminals R, S and T is OK
Connect all three
phase well
Check if the screws of terminals are tightened
No
Tighten all screws
Yes
Please check the wiring
and power system for
abnormal power
Maybe AC motor drive has malfunction or misoperation
due to noise. Please contact with DELTA.
Check if the input voltage of R, S, T is unbalanced
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