Chapter 7 Troubleshooting |VFD-B Series

7.5 Over Heat (OH)

AC motor driv e overheats

Heat sink overheats

Check if temper atur e of heat si nk No

is greater than 90 OC

Ye s

Temperature detection mal functions.

Please contac t DELTA.

Ye s

Is load too large

No

Reduc e load

If cooling fan functions normally No

Ye s

Change cooling fan

Check if cooling fan is jammed Yes

Remove obstruc tion

No

Check if sur roundi ng temper atur e Yes

is withi n specific ation

No

Maybe AC motor drive has malfunction or

misoperation due to noise. Pleas e contact

D E LTA .

Adjust surrounding temperature

to speci fic ati on

7.6 Overload

OL

OL1/ OL2

Check for correct settings at

Pr. 06-06 and 06-07

Yes

Is load too large No

Yes

No

Modify setting

Maybe AC motor drive has malfunction

or misoperation due to noise.

Reduce load or increase the power of AC motor drive

7-4

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