Danfoss VLT5000 SyncPos Operating Instructions Manual page 185

24 TESTTIM
Once the target window has been reached the posi-
tion is read twice and compared with the parameter
TESTVAL (25). If the result is less than TESTVAL (25),
then the position has been reached, otherwise a
new reading is taken. TESTTIM indicates the time
interval between the measurements.
Content
Measuring time in target window
Parameter Group
Axis parameter Inputs/Outputs AXI
CAM-Editor: index card Inp/Outp
Unit
ms
Value range
0 ... 10
NB!
The reason for the limitation to 10 ms is to be
seen, that the function diffval waits really and
in this time the monitoring of the limit switch and the
position error is not active. For this reason the value
should be not too long.
25 TESTVAL
Once the target window has been reached the posi-
tion is read twice with an interval of TESTTIM (24)
and the interval is compared with the target window
limit value limit value limit value TESTVAL. The result determines whether
limit value limit value
the position is viewed as having been reached or
not.
NB!
For longer time intervals it must be taken into
consideration that reaching this target posi-
tion will be delayed by this amount of time in any
case.
Content
Limit value for readings in target window
Parameter Group
Axis parameter Inputs/Outputs AXI
CAM-Editor: index card Inp/Outp
Unit
qc
Value range
1 ... 65535
184
Programmable SyncPos motion controller
26
All path information in motion commands are made
in user units and are converted to quad-countsinter-
nally. By choosing these scaling units correspon-
dingly it is possible to work with any technical
measurement unit (for example mm).
This factor is a fraction which consists of a nume-
rator and denominator.
POSFACT_Z / POSFACT_N = 1 User unit [UU]
Scaling determines how many quad-counts make
up a user unit. For example, if it is 50375/1000, then
one UU corresponds to exactly 50.375 qc.
In CAM mode, the parameter is used to determine
the unit for the slave drive so that it is possible to
work with meaningful units in the CAM-Editor. See
prerequisites of the formula and example under
POSFACT_Z (23).
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In addition, it is possible to compress or expand the
curves with this factor without having to define new
curves each time.
The use of numerator and denominator for the gea-
ring factor leads to a very precise result since
transmission ratios can be represented as a fraction
in virtually all cases.
Content
Denominator user factor
or in CAM mode conversion of the units qc in UU
Parameter Group
target window target window
target window target window
Axis parameter Encoder AXE
CAM-Editor: index card Encoder
Value range
1 ... MLONG
Sample
See POSFACT_Z (23)
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POSFACT_N
MG. 1 0.J8.02 – VLT is a registered Danfoss trade mark
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