Danfoss VLT 5000 Operating Instructions Manual page 43

Error messages
All messages are shown in P798 in the VLT 5000
LCP display. You can find detailed information,
additional notes on possible causes of errors as
well as tips for clearing errors in the following
section:
P798 – 0: Status OK. No errors detected.
Meaning
No errors detected.
P798 – 1: Homing needed
Meaning
The user has issued a positioning command to a
certain position while the home position is not
defined.
Note
The error must be cleared and a homing sequence
successfully completed before the next position
command is issued to the application.
P798 – 2: Positive hardware limit exceeded
Meaning
The positive hardware switch input has been
activated.
Causes
The application has hit the positive limit marker
switch. Alternatively, the connection to the limit
switch has been lost or the limit switch is defect.
P798 – 3: Negative hardware limit exceeded
Meaning
The negative hardware switch input is activated.
Causes
The application has hit the negative limit marker
switch. Alternatively, the connection to the limit
switch has been lost or the limit switch is defect.
42
Positioning Controller
P798 – 4: Positive software limit exceeded
Meaning
A motor command will cause / has caused the
software limit switch to be activated. The maximum
limit specified in P744.
Note
Before the error can be cleared the application
must be moved back from the limit. If "power
recovery" is enabled in P736, this can be done
through an error reset and a negative jog
(input 54).
P798 – 5: Negative software limit exceeded
Meaning
A motor command will cause / has caused the
software limit switch to be activated The minimum
limit specified in P745.
Note
Before the error can be cleared the application
must be moved back from the limit. If "power reco-
very" is enabled in P736 this can be done through
an error reset and a positive jog (input 53).
P798 – 6: VLT not running
Meaning
The motor was not magnetized in a situation where
it should have been. The electromechanical brake
is immediately activated in this case regardless of
the settings in P718 and P725.
Causes
While the motor was holding/driving the load, the
drive has tripped, connection to terminal 27 was
lost or the [STOP] button was pressed on the LCP.
P798 – 7: Brake wear limit exceeded
Meaning
This error message is given if the drive has moved
more than the allowed number of user units
specified in P735 while the electronic brake was
activated.
Causes
The mechanical brake is worn and should be
replaced in the near future or the limit specified in
P735 is too low.
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