Delta Electronics VFD-G manual Motor cannot Run, Troubleshooting, Revision July 2008, EG03, SW

Chapter 5 Troubleshooting

5.9 Motor cannot Run

			Check PU01		No
	Motor cannot run		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	If jumper or DC reactor No
no faults occur
	command		is connected between
	by keypad		+1 and +2(+2/B1)

Use jumper or DC reactor

Yes

Yes

Press RUN key to

check if it can run

Maybe AC motor drive has malfunction or misoperation

due to noise. Please contact DELTA.

Press UP key to

set frequency

Yes

No Check if input FWD

No

Check if the wiring

Yes

or REV command

of FWD-DCM and

Change switch or relay

Press UP to

REV-DCM is correct

check if motor

Yes

can run

No

No

No Set frequency or not

No

Correct connection

Modify frequency

Yes

setting

if upper bound freq.

No

Check if the parameter

and setting freq. is

lower than the min.

setting and wiring of

Yes

Change defective

output freq.

analog signal and

potentiometer and

No

multi-step speed

relay

are correct

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 July 2008, EG03, SW V1.06