VLT
®
Series 3500
107
Is the control card over-
loaded? Disconnect all
control signal plugs on the
control card. Does the fault
disappear?
No Yes
Symptom
No fault message or
backlight in the display
Have the input fuses
blown?
No Yes
Check the drive’s input for
shorts. Replace the fuses.
Contact Danfoss
11)
12)
10)
9)
8)
7)
The fault can be caused by
short-circuiting on the
control signals. The 24 V
supply might be short-
circuited.
Contact Danfoss
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