Danfoss VLT5000 SyncPos Operating Instructions Manual page 180

15 POSERR
The maximum T T T T T olerated position error olerated position error olerated position error olerated position error olerated position error POSERR
defines the tolerance allowed between the current
actual position and the calculated command posi-
tion. If the value defined with POSERR is exceeded
then the position control is turned off and a position
error is triggered.
Content
Maximum T T T T T olerated position error olerated position error olerated position error olerated position error olerated position error
Parameter Group
Axis parameter PID-Controller AXR
CAM-Editor: index card PID
Unit
qc
Value range
1 ... MLONG
The maximum T T T T T olerated position error olerated position error olerated position error olerated position error olerated position error does not
affect the positioning accuracy, but merely deter-
mines how precisely the theoretically calculated
path of motion must be followed, without an error
being triggered.
NB!
For safety reasons the maximum T T T T T olerated
position error position error
position error position error selected should not be too position error
large since this could be dangerous for both the
machine and its operator.
On the other hand, if the values for the T T T T T olerated
position error position error are too small this could result in position error
position error position error
frequent errors. As a guideline, it is wise to set the
quadruple of Encoder counts per revolution. This
corresponds to one encoder rotation.
MG.10.J8.02 – VLT is a registered Danfoss trade mark
Programmable SyncPos motion controller
16
The offset filter SYNCOFFTIME also influences the
way, how a new SYNCPOSOFFS value is handled.
The offset which has to be realized will be done step
by step. The step which is realized every sample
time (ms) is calculated as follows:
step size =
SYNCMPULSM / SYNCOFFTIME (integer part)
So it will take around SYNCOFFTIME to realize the
offset. SYNCOFFTIME also has influence on the
marker start correction and on the correction of
marker error (see SYNCMFTIME).
Content
Compensation velocity of an offset (1. synchronize;
2. new offset)
Parameter Group
AXS Synchronization
(It is not yet in the parameter dialog window.)
★ 20000
Unit
1 msec
Value range
0 ... MLONG
17
olerated olerated olerated
olerated
This parameter SYNCMFPAR is used to influence
the behavior of marker filtering, see SYNCMFTIME.
Content
olerated olerated
olerated olerated
Marker filter configuration
Parameter Group
AXS Synchronization
(It is not yet in the parameter dialog window.)
Value range
0 or 1 or 2 or 4 or 16
0 = Every time we find a real master marker, we
calculate the Marker Filter constant as the
Filtered Old master velocity * SYNCMFTIME /
(SYNCMPULSM * 3 )
1 = Calculate the Marker Filter constant as
SYNCMFTIME/300
2 = Gear correction is made
4 = Correction time is used instead of using
SYNCOFFTIME
16= We don't make the correction concerning the
error of marker distances.
For further descriptions of the selection see
SYNCM FTIME
SYNCOFFTIME
SYNCMFPAR
★ 0
★ 0
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