Delta Electronics VFD-M manual Motor cannot Run, Troubleshooting

Chapter 5 Troubleshooting

5.9 Motor cannot Run

Check No

Motor cannot run keypad for normal display

			Yes
Reset after clearing	Yes Check if there is any
fault and then RUN		fault code displayed
		No

Check if non-fuse breaker and magnetic contactor are ON

	Yes
Check if input		No
voltage is normal
	Yes

No Set them to ON

Check if any faults occur, such as Lv, PHL or disconnection

It can run when	Input "RUN"	No
no faults occur
	command
	by keypad

Maybe AC motor drive has malfunction or misoperation due to noise. Please contact DELTA.

Press RUN key to check if it can run

Press UP key to set frequency

Yes

Press UP to check if motor can run

No

Yes

No Check if input FWD or REV command

Yes

No Set frequency or not

No

No

Check if the wiring	Yes
of M0-GND and
M1-GND is correct

No

Correct connection

Change switch or relay

Modify frequency	Yes
setting

if upper bound freq. and setting freq. is lower than the min. output freq.

No

No

Check if the parameter setting and wiring of analog signal and multi-step speed

are correct

Yes	Change defective
	potentiometer and
	relay

Motor has malfunction					Check if there is any			No
									Maybe AC motor drive has malfunction.
					output voltage from
		No			terminals U, V and W				Please contact DELTA.
							Yes
	If load is too large			Yes
		Yes
						Check if motor		No
	Check if the setting					connection			Connect correctly
			Yes			is correct
	of torque
	compensation
	is correct					Motor is locked due to large load, please reduce load.
		No				For example, if there is a brake, check if it is released.
	Increase the setting of
	torque compensation

5-6 Revision May 2008, ME14, SW V3.04