VLT® 5000 Crane
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Trouble-shooting
Symptom
How to handle
1. Motor runs unevenly
If the motor runs unevenly, but no fault is given, this may be because
the frequency converter has been wrongly set.
Adjust the motor data settings.
Contact Danfoss if the new setting does not make the motor run
evenly
2. Motor does not run
Check if there is a backlight in the display.
If there is a backlight, please check if a fault message is displayed.
If yes, please consult the Warnings-section, if no, please refer to
symptom 5.
If there is no backlight, check if the is connected to mains supply. If
yes, please refer to symptom 4.
3. Motor does not brake
Please refer to symptom 6.
4. No message or backlight in
display
Check if the prefuses for the have blown.
If yes, call Danfoss for assistance.
If no, check if the control card is overloaded.
If so, disconnect all control signal plugs on the control card and
check if the fault disappears.
If yes, make sure that the 24 V supply is not short-circuited.
If no, call Danfoss for assistance.
5. Motor stopped, light in display,
but no fault report
Start the by pressing [START] on the control panel.
Check if the display is frozen, ie. the display cannot be changed
or is indefineable.
If yes, check if screened cables have been used and are connected
correctly.
If no, check that the motor is connected and that all motor phases
are OK.
The must be set to run using local references:
Parameter 002 = Local operation
Parameter 003 = desired reference value
Parameter 512 = FC Profile
Connect 24 V DC to terminal 27.
The reference is changed by pressing
’
+
’
or
’
-
’
.
Is the motor running?
If yes, check whether control signals to the control card are OK.
If no, call Danfoss for assistance.
MG.50.N4.02 - VLT is a registered Danfoss trademark
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