Overload; Over Heat (Oh) - Delta VFD-B Series Manual

Chapter 7 Troubleshooting

7.5 Over Heat (OH)

AC motor drive overheats
Heat sink overheats
Check if temperature of heat sink
is larger than 90
If load is too large
If cooling fan functions normally
Check if cooling fan is jammed
Check if surrounding temperature
is within specification
Adjust surrounding temperature
to specification

7.6 Overload

OL
Reduce load or increase the power of AC motor drive
7-4
VFD-B Series
No
O
C
Yes
Yes
No
No
Yes
Yes
No
Yes
OL1/ OL2
Check if the setting of electronic
thermal relay is suitable
Yes
If load is too large
Yes
Temperature detection malfunctions.
Please contact with DELTA.
Reduce load
Change cooling fan
Remove obstruction
Maybe AC motor drive has malfunction or
No
misoperation due to noise. Please contact
with DELTA.
No
Maybe AC motor drive has malfunction
No
or misoperation due to noise.
Modify setting
Revision 10/2005, BE13, SW V4.08