Danfoss MCO 305 Design Manual page 220

MCO 305 Design Guide
Function
Defines how large the difference between the
actual master and slave position can be during a
position synchronization (SYNCP and SYNCM), so
that the required accuracy is still fulfilled. In con-
trast SYNCERR provides the actual synchronization
error of the slave in user units.
In the program you can query whether SYNC-
ACCURACY will be fulfilled using SYNCSTAT.
SYNCACCURACY is important for the marker syn-
chronization in order to be able to report READY,
since otherwise SYNCERR would have to be queried
and compared beforehand.
Window set by SYNCACCURACY
The dark line is the position followed by master and
slave follows it. SYNCACCURACY sets the window
as 100. So when the slave within the window the
accuracy flag sets.
NB!:
The new size of the sync windows will
only be active after a new SYNC-
command. This does not only concern the
activation but also changes in size of the windows.
33-14 Relative Slave Velocity Limit
SYNCVELREL
Range [Unit]
0 – 100 [%]
0 = Off, i.e. no restriction
Syntax
SET SYNCVELREL value
value = percent value
default setting
220
__ Parameter Reference __
0
[ ] value for use in communication via serial communication port
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Function
Tolerated deviance of the slave drive from the
master velocity in %.
This parameter indicates by how many percent the
slave drive can deviate from the velocity of the
master while attempting re-synchronization.
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.
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