193
MG.10.J8.02 – VLT is a registered Danfoss trade mark
Programmable SyncPos motion controller
51
SYNCTYPE
Content
Type of synchronization: Normal synchronization (0)
or with look ahead synchronization (1).
Description
The way how synchronisation is done can be
changed:
In the standard case (SYNCTYPE=0), the position
difference is eliminated.
That means, that the actual master position (where
master is now) is compared with the future slave
position (where slave will be in 1 msec). Thus you
will always drive behind master, as long as you don’t
use INTEGRAL.
If you choose SYNCTYPE = 1, the system compares
actual master position with actual commanded
position. That means, that the system will try to make
this zero, no matter how PID is set.
NB!
Be aware, that SYNCERR equals to actual
(new) master command position minus actual
position of the slave plus pending errors of filtering
and pending corrections.
Parameter Group
Axis parameter Synchronization AXS (It is not yet in
the parameter dialog window.)
Value range
0 … 1
★
0
0 =
The actual master position is compared with
the future slave position (where slave will be
in 1 msec). (This is the way it is done with PC
version < 5.04)
1 =
The actual master position is compared with
actual commanded position.
52
SYNCMARKM
SYNCMARKM and SYNCMARKS must be set accor-
ding to the ratio between the number of marker
signals from master and slave.
A ration of 1:1 means that each slave marker will
be aligned with each master marker. A ratio of 2:1
means that each slave marker will be aligned with
each second master marker.
Content
Marker number of the master
Parameter Group
Axis parameter Synchronization AXS
CAM-Editor: index card Synchron.
Value range
0 … 65535
★
1
53
SYNCMARKS
SYNCMARKM and SYNCMARKS must be set
according to the ratio between the number of mar-
ker signals from master and slave.
A ration of 1:1 means that each slave marker will be
aligned with each master marker. A ratio of 2:1
means that each slave marker will be aligned with
each second master marker.
Content
Marker number of the slave
Parameter Group
Axis parameter Synchronization AXS
CAM-Editor: index card Synchron.
Value range
0 … 65535
★
1
Example
The master marker is an external signal which
reports when a transport article arrives; the corres-
ponding slave marker is the index impulse of the
motor. If the motor always requires 3 rotations until
the article arrives, then this means that 3 index
impulses must elapse before a marker comes.
Thus, this results in a ratio of 3 : 1; only every 3rd
slave pulse is evaluated.
Parameter Reference