Danfoss MCO 305 Design Manual page 197

MCO 305 Design Guide
For example: during changes in par. 33-12 Position
Offset for Synchronization, or at the start of syn-
chronization, or during the correction of deviation
for marker evaluation. The following is valid:
If the slave need to catch up it runs with the maxi-
mum speed allowed; this is either the speed set
with VEL or the master velocity calculated with
MAVEL + (MAVEL * SYNCVELREL/100)
depending which of the two is less. (MAVEL is the
actual master velocity).
If the slave needs to slow down and wait for the
master it will run with at least the following speed
MAVEL – (MAVEL * SYNCVELREL/100).
That means, if SYNCVELREL is 50, for example, the
slave will not run slower than MAVEL/2.
33-15 Marker Number for Master
SYNCMARKM
Range
1 – 10000
Function
The Marker Number for Master and Slave must be
set according 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.
33-16 Marker Number for Slave
SYNCMARKS
Range
1 – 10000
default setting
__ Parameter Reference __
1
1
[ ] value for use in communication via serial communication port
®
MG.33.L4.02 – VLT is a registered Danfoss trademark
Function
The Marker Number for Master (par. 33-15) and
Slave must be set according 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.
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
rd
every 3 slave pulse is evaluated.
33-17 Master Marker Distance
SYNCMPULSM
Range [Unit]
0 – MLONG
[qc] or in CAM mode [MU]
Function
The Master Marker Distance indicates how many qc
(master) lie between two master markers or in
CAM-Mode the distance between sensor and wor-
king position.
If you use the encoder index impulse as a marker
signal, then the distance between two markers is
the resolution (qc) of the encoder.
If external marker signals are used, then it is pos-
sible to measure the marker distance with the pro-
gram "marker count" (refer to sample program), if
it is unknown.
Master Marker Distance is only valid for synchroni-
zation with marker correction (SYNCM and
SYNCCMM).
In a CAM synchronization, the distance of the sen-
sor to the working position in MU will be indicated
instead of the distance between two master mar-
kers. (The distance is brought about automatically
by the master cycle length (Mt).)
If the parameter is larger than one master cycle
length (Mt), a marker-FIFO register will be created
automatically for he marker correction handling.
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