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MG.10.J8.02 – VLT is a registered Danfoss trade mark
Programmable SyncPos motion controller
If the motor vibrates heavily …
… then you have to optimize the PID controller and
to adjust the other parameters of the controller:
reduce either the
Proportional factor
Proportional factor
Proportional factor
Proportional factor
Proportional factor
KPROP (11)
or increase the
Derivative factor
Derivative factor
Derivative factor
Derivative factor
Derivative factor
KDER (12).
If a "tolerated position error is exceeded" is
reported
If the drive stops due to a “tolerated position error is
exceeded” message it is possible to determine
whether the drive was rotating in the wrong direction
by comparing the curves of the set and actual
values.
Check the connections of the motor or encoder. If
the connections are correct, then it is necessary to
increase the
T
T
T
T
Tolerated position error
olerated position error
olerated position error
olerated position error
olerated position error
POSERR (15).
(See Optimizing the PID controller)
Starting the
SyncPos motion controller
step-by-step
■
■
■
■
■
Execute the test run program
Now connect the motor to the VLT, make sure that
the motor can turn completely freely.
N B!
The motor must be provided with an
[EM E RGE NCY STOP] button.
Click on "FILE" and "OPEN" the file Move-
Move-
Move-
Move-
Move-S.m
S.m
S.m
S.m
S.m.
Click on "DEVELOPMENT" and start the test pro-
gram with "EXECUTE" or [F5].
The test is successful if the motor runs slowly back
and forth and position 500 is registered.
End the test with [ESC] and "CLOSE" the "FILE".
If the motor sets off uncontrolled or vibrates heavily
NB!
Turn off the motor immediately with the
EMERGENCY STOP button if it vibrates
heavily or sets off uncontrolled.
If the motor sets off uncontrolled, but the encoder
test previously was successful, then decrease the
Proportional factor
Proportional factor
Proportional factor
Proportional factor
Proportional factor
(parameter 702). (See Optimi-
zing the PID controller)
If the motor doesn’t move
If the motor doesn’t move at all, then the proportio-
nal factor of the PID filter is probably too low or the
VLT has not been enabled.
Check the VLT enable (terminal 27 = 24 V) and
check that the VLT wasn't stopped via the LCP
(flashing display). Then increase the
Proportional
Proportional
Proportional
Proportional
Proportional
factor
factor
factor
factor
factor
(parameter 702). (See Optimizing the PID
controller)