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Chapter 5 Troubleshooting |DD Series
5-9
5-8 Phase Loss (PHL)
Phase loss
No
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
Maybe AC motor drive has malfunction or misoperation
due to noise. Please contact DELTA.
No
Yes
Yes
Please check the wiring
and power system for
abnormal power
Check if the input voltage of R, S, T is unbalanced
Yes
Yes
Please check the wiring
and power system for
abnormal power
Check if the input voltage of R, S, T is unbalanced