Delta Electronics VFD-EL manual Keypad Display is Abnormal, Phase Loss PHL

5.7 Keypad Display is Abnormal

Abnormal display or no display

Yes

Cycle power to AC motor drive

Display normal? No

Yes

AC motor drive works normally

Chapter 5 Troubleshooting

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.

5.8 Phase Loss (PHL)

	Phase loss
			No
Check wiring at R, S and T terminals
		Yes

Correct wiring

Check if the screws of terminals are tightened		No	Tighten all screws
	Yes

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

No

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.

Revision August 2008, 2ELE, V1.02 5-5