Phase Loss Phl - Delta VFD-VJ Series User Manual

5-8 Phase Loss PHL

Are main circuit power terminals R, S, and T all
Power supply suffers
phase loss
connected completely
Yes
Are all screws on terminal
plate tightened
Yes
Is voltage of the three phase
power supply unbalanced
No
It's likely hybrid servo drive breaks
down or malfunctions due to
noise. Please contact Delta for
assistance.
No
No
Tighten all screws
Please check wiring and
Yes
5-11
5. Fault Diagnostic Methods
Connect the three
phases securely
power system for
abnormal behavior