Danfoss MCO 305 Design Manual page 227

MCO 305 Design Guide
SYNCMFPAR & 4 Correction Time
Is used instead of using
par. 33-27 SYNCOFFTIME.
SYNCMFPAR & 16 No correction concerning
the error of marker
distances will be done.
Marker correction SYNCMFTIME == 0
In the first case where marker correction > 0, the
correction is spread over a time of
(-SYNCVFTIME / 100) ms.
In the second case the correction is added to the
demand position at once.
The reaction of course is limited by the actual
acceleration and deceleration in every case.
Marker distance calculation
If SYNCMFTIME is set, then the G_MMarkerDist is
calculated a little differently. If the time set results
in a number of markers which is smaller than 100,
then at least 100 are taken to calculate the
average marker distance (Filter). This only affects
the calculation of the marker distance. The other
filter calculations (deviation) are still done with the
number of markers calculated by par. 33-29
SYNCMFTIME and actual velocity of master.
Calculation of marker distance (if markers < 100)
is changed starting with MCO 5.00.
See also Marker Correction illustration in chapter
"Technical Reference" in "MCO 305 Command
Reference".
33-30 Maximum Marker Correction
SYNCMMAXCORR
Range [Unit]
-MLONG – MLONG [qc]
0 = no limitation
Function
SYNCMMAXCORR is used to limit the maximum
correction done by marker correction. This is
working with SYNCM and SYNCC. The value is
given in qc (slave) by the customer using the SET
SYNCMMAXCORR command.
The value > 0 limits the marker correction by the
given value. So if the correction would be bigger it
is limited to the given value
The value < 0 sets the parameter so that no
correction at all is done. The customer can switch
off marker correction by this value.
default setting
__ Parameter Reference __
0
[ ] value for use in communication via serial communication port
®
MG.33.L5.02 – VLT is a registered Danfoss trademark
Support of value < 0 is starting with MCO 5.00.
NB!:
If you have set par. 33-29 Filter Time for
Marker Correction or par. 33-26 Velocity
Filter (negative), this correction will be
spread over a certain time, depending on these
factors.
33-31 Synchronization Type
SYNCTYPE
Option
Standard
Look ahead
Function
The way how synchronization is done can be
changed:
0 = The actual master position is compared with
the future slave position (where slave will be in
1 ms).
1 = The actual master position is compared with
actual commanded position.
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 ms). Thus it will
always drive behind the master, as long as no
INTEGRAL is used.
If SYNCTYPE = 1 is selected 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.
33-32 Feed Forward Speed Adaptation
SYNCFFVEL - 109
Range
0 ... MLONG [per mill von VCMD]
0 = disabled
[0]
[1]
0
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