Chapter 7 Troubleshooting |VFD-B Series

7.9 Motor cannot Run

Motor cannot run

Check PU01

for normal

No

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

No

Set them to ON

contactor are ON

Yes

Check if input

No

voltage is normal

Yes

Check if any faults

occur, such as

Lv, PHL or

disconnection

It can run when

no faults occur

Input "RUN"

command

by keypad

No

If jumper or DC

No

reactor is connected

between +1 and +2/B1

Use jumper

or DC reactor

Press RUN key to

check if it can run

Yes

Yes

Maybe AC motor drive has malfunction or misoperation

due to noise. Please contact DELTA.

Press UP key to

set frequency

Yes

Press UP to

check if motor

can run

No

No Check if input FWD

No

Check if the wiring

of terminal FWD

or REV command

and between

REV-DCM is correct

Yes

No Set frequency or not No

No

Correct connection

Yes

Change switch or relay

Modify frequency

Yes

setting

No

if upper bound freq.

and setting freq. is

Check if the parameter

lower than the min.

output freq.

setting and wiring of

analog signal and

Yes Change defective

potentiometer and

No

multi-step speed

are correct

relay

Motor has malfunction

No

Check if there is any

output voltage from

No

Maybe AC motor drive has malfunction.

terminals U, V and W

Please contact DELTA.

If load is too large

Yes

Yes

Yes

Check if the setting

of torque

Yes

Check if motor

connection

is correct

No

Connect correctly

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

7-6

Revision July 2008, BE16, SW V4.08 & V5.00