Danfoss MCO 305 Design Manual page 195

MCO 305 Design Guide
Function
The synchronization is described with a ratio of qc
(Master : Slave); SYNCFACTM determines the syn-
chronization factor for the master.
Syncfactor Master and par. 33-11 Syncfactor Slave
make the compensation of different drive factors
possible or the adaptation of the slave speed in
relation to the master speed set.
Slave Velocity
par.
M a ster Velocity
par.
In conjunction with curve synchronization the para-
meters SYNCFACTM and SYNCFACTS are used to
transform qc into MU units.
This allows the user to work with meaningful units
in the CAM-Editor. See example 2 below.
Gearing Factor Encoder
Scaling Factor
provided that:
Motor Revolution
Gearing Factor
Revolution
Encoder = Incremental encoder (the multiplier
4 is omitted in the case of absolute
encoders)
Scaling factor = Number of user units UU (qc) that
correspond to one revolution at the
drive.
Example 1
If the master is to run twice as fast as the slave,
then the ratio is 2 : 1
par. 33-10 Syncfactor Master
par. 33-11 Syncfactor Slave
Example 2
Conveyor belt:
The input should be possible in 1/10 mm
resolution.
The drive is connected to the conveyor belt with a
gearing of 25:11; this means that the motor makes
25 revolutions and the drive pulley 11.
Gear factor = 25/11
Incremental encoder directly on the master drive;
encoder resolution = 4096
The drive pulley has 20 teeth/revolution, 2 teeth
correspond to 10 mm; thus, 1 revolution = 100
mm conveyor belt feed.
Thus, the scaling factor is 1000
default setting
__ Parameter Reference __
33 - 11 S yncfactor Slave
33 - 10 S yncfactor Master
Resolution 4
qc 1 MU
s
s on Output
= 2
= 1
[ ] value for use in communication via serial communication port
®
MG.33.L4.02 – VLT is a registered Danfoss trademark
25/11 4096 4 25
qc
1000 1000
2048 par. 33
qc 1 MU
55 par. 33
Set the following parameters in order to work with
1/10 degree division
par. 33-10 Syncfactor Master
par. 33-11 Syncfactor Slave
Example 3
Calculation of the scaling factor for a friction drive:
Assume that the output is equipped with a friction
wheel (radius 60 mm); we want to work with a
resolution of 1/10 mm:
One revolution on the output is thus calculated as
follows:
Scaling factor = 2
= 3969.91
Scaling factor = 3970
Since an error will occur in any case due to the
rounding, a marker adjustment must be performed
after each full revolution.
33-11 Synchronization Factor Slave (M:S)
SYNCFACTS
Range
–MLONG – MLONG
Function
The synchronization is described with a ratio of qc
(Master : Slave); Syncfactor Slave determines the
synchronization factor for the slave.
Parameters 33-10 Synchronizing Factor Master and
33-11 Syncfactor Slave make the compensation of
different drive factors possible or the adaptation of
the slave speed in relation to the master speed set.
Slave Velocity
par. 33 - 11
Master Velocity
par. 33 - 10
In conjunction with CAM synchronization the para-
meters Synchronizing Factor Master and Slave are
used to transform qc into MU. This allows the user
to work with meaningful units in the CAM-Editor.
See example 2 in par. 33-10.
See prerequisites of the formula in par. 33-10
Synchronizing Factor Master .
Gearing Factor Encoder
Scaling Factor
4096 4
qc 1 MU
11
- 10 Syncfactor Master
- 11 Syncfactor Slave
= 2048
= 55
r * 10 = 2 * 60 * 10
Syncfactor Slave
Syncfactor Master
Resolution 4
qc 1 MU
195
1