Delta VFD-B User Manual

Chapter 7 Troubleshooting |VFD-B Series
Revision July 2008, BE16, SW V4.08 & V5.00 7-5
7.7 Display of PU01 is Abnormal
Abnormal display or no display
Cycle power to AC motor drive
No
Ye s
Ye s
Ye s
No
Display normal?
AC motor drive works normally
Fix connector and eliminate noise
Check if all connectors are connect
correctly and no noise is present
AC motor drive has malfunction.
Please contact DELTA.
7.8 Phase Loss (PHL)
Phase loss
No
No
Yes
Yes
Check wiring at R, S and T terminals Correct wiring
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 DELTA.
Check if the input voltage of R, S, T is unbalanced

Delta VFD-B Specifications

General

Series	VFD-B
Power Range	0.4kW to 15kW
Control Method	V/F Control, Sensorless Vector Control
Overload Capacity	150% for 60 seconds
Braking Unit	Built-in
Communication	RS-485
Protection Features	Over-voltage, Over-current, Overheat, Under-voltage, Ground fault, Short circuit