Trouble-Shooting; Miscellaneous - Danfoss VLT 5000 FLUX Operating Instructions Manual

Trouble-shooting

Symptom
1. Motor runs unevenly
2. Motor does not run
3. Motor does not brake
4. No message or backlight in
display
5. Motor stopped, light in display,
but no fault report
120
How to handle
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 or run an AMA.
Contact Danfoss if the new setting does not make the motor run
evenly
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.
Please refer to section Control with brake function .
Check if the prefuses for the VLT 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.
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
correctly.
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:
Connect 24 V DC to terminal 27, 37 and 18
Parameter 002 = Local operation
Parameter 003 = desired reference value
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.55.A6.02 - VLT is a registered Danfoss trademark
®
VLT 5000 FLUX