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 frequency converter is connected to
mains supply. If yes, please refer to symptom 4.
3. Motor does not brake
Please refer to Control with brake function.
4. No message or backlight in display Check if the prefuses for the frequency converter 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 frequency converter 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 cor-
rectly.
If no, check that the motor is connected and that all motor phases are
OK.
The frequency converter must be set to run using local references:
Parameter 002 = Local operation
Parameter 003 = desired reference value
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.
VLT
®
5000 Series
156 MG.51.C5.22 - VLT
p
is a registered Danfoss trademark.
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