Delta Electronics VFD-VL manual Motor cannot Run

Chapter 5 Troubleshooting

5.9 Motor cannot Run

Motor cannot run

Reset after clearing fault and then RUN

Check if CE01		No
displays
normally
	Yes

Check if there is any 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 no faults occur

Input "RUN"	No	If jumper or DC	No	Use jumper
		reactor is connected
command				or DC reactor
		between +1 and +2/B1
by keypad

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

No Check if input FWD

No Check if the wiring

Yes

Yes

or REV command

of terminal MI1

Change switch or relay

Press UP to

and between

MI2-DCM is correct

check if motor

Yes

can run

No

No

No

No Set frequency or not

Correct connection

Modify frequency

Yes

setting

if upper bound freq.

No

and setting freq. is

Check if the parameter

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

Check if there is any

Motor has malfunction

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 Nov. 2008, VLE1, SW V1.03