Danfoss MCO 305 Design Manual page 196

MCO 305 Design Guide
Examples
See par. 33-10 Synchronizing Factor Master .
33-12 Position Offset for Synchronization
SYNCPOSOFFS
Range [Unit]
–MLONG/p. 33-11 SYNCFACTS –
MLONG/p. 33-11 SYNCFACTS [qc]
Function
Defines the offset for position synchronization
(SYNCM, SYNCP). The offset is also valid for posi-
tion synchronization with marker correction.
This position offset can be altered online at any
time during the synchronization with a command.
Slave Offset
. p 33 - 12 SYNCPOSOFF S
par.
The offset will be executed immediately when the
command SYNCP follows.
When SYNCM is started, however, the system waits
for the first evaluation of the marker pulses. Only
then is the offset applied.
To avoid compatibility problems you should deter-
mine the start-up behavior of SYNCM with par. 33-
23 Start Behavior for Sync .
33-13 Accuracy Window for Position Sync.
SYNCACCURACY
Range [Unit]
–MLONG – MLONG [qc]
0 – MLONG = A plus sign supplies the
absolute value to SYNCERR.
–MLONG to –1 = A minus sign supplies the syn-
chronization error to SYNCERR
with polarity sign. It is then pos-
sible to tell whether the synchro-
nization is running ahead or
behind.
default setting
196
__ Parameter Reference __
par. 33 - 11 S yncfactor Slave
33 - 10 S yncfactor Master
1000
[ ] value for use in communication via serial communication port
®
MG.33.L4.02 – VLT
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.
0
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.
33-14 Relative Slave Velocity Limit
SYNCVELREL
Range [Unit]
0 – 100 [%]
0 = Off, i.e. no restriction
Syntax
SET SYNCVELREL value
value = percent value
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.
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