Delta Electronics VFD-E manual Over Heat OH, Overload

Chapter 5 Troubleshooting

5.5 Over Heat (OH)

AC motor drive overheats

Heat sink overheats

Check if temperature of heat sink No is greater than 90 OC

Yes

Temperature detection malfunctions. Please contact DELTA.

Is load too large		Yes		Reduce load
	No
			No
If cooling fan functions normally
					Change cooling fan
	Yes
			Yes		Remove obstruction
Check if cooling fan is jammed
	No
Check if surrounding temperature				No		Maybe AC motor drive has malfunction or
is within specification						misoperation due to noise. Please contact
						DELTA.
	Yes
Adjust surrounding temperature
to specification

5.6 Overload

OL		OL1/ OL2
	Check for correct settings at
	Pr. 06-06 and 06-07
			Yes
				No
	Is load too large
			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

5-4 Revision June 2008, 04EE, SW--PW V1.11/CTL V2.11