Danfoss MCO 305, Design Manual, Page: 185 / 242

MCO 305 Design Guide
__ Parameter Reference __
¾ default setting [ ] value for use in communication via serial communication port
MG.33.L4.02 – VLT
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is a registered Danfoss trademark
185
32-10 Rotational Direction
POSDRCT
Option
¾ No action [1]
Reference reversed [2]
User units reversed (–1) [3]
UU and Reference reversed (–2) [4]
Function
Normally a positive reference value brings about a
positive change of the position. If this is not the
case, the reference value can be reversed
internally. The following options are available:
1 = No change, i.e. positive reference values pro-
duce positive encoder values.
2 = The sign of the reference value is reversed
internally (plus becomes minus and vice
versa). This is equal to a reversal of the motor
leads, or a transposition of the A and B tracks
on the encoder.
3 = The sign of the user unit is reversed. Thus,
positive reference values produce positive en-
coder values which are indicated as negative
values, however. This applies to all outputs
(APOS, CPOS, …), all user inputs (POSA, POSR,
…), and all synchronization factors as well as
the velocities (CVEL, par. 33-03
Velocity for
Home Motion ).
4 = Same as [2], i.e. the sign of the reference
value is reversed internally; in addition, the
sign of the user unit is negated as in [3].
The direction of rotation (relation to master) can be
turned by negative par. 33-10
Synchronizing Factor
Master .
32-11 User Unit Denominator
POSFACT_N
Range
1 – MLONG
¾
1
Function
All path information in motion commands is made
in user units and are converted to quad-counts
internally. By choosing these scaling units corres-
pondingly 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.
Denomintor Unit User
Numerator Unit User
11 - 32 par.
12 - 32 par.
UU Unit User 1
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
par. 32-12
User Unit Numerator .
UU 1 qc
Factor Scaling
4 Resolution Encoder Factor Gearing
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 gearing factor leads to a very
precise result since transmission ratios can be
represented as a fraction in virtually all cases.
32-12 User Unit Numerator
POSFACT_Z
Range
1 – MLONG/max. position (UU) ¾ 1
Function
All path information in motion commands are made
in user units and are converted to quad-counts
internally. By choosing these scaling units corres-
pondingly it is possible to work with any technical
measurement unit (for example mm).
This factor is a fraction which consists of a numera-
tor and denominator.
Denomintor Unit User
Numerator Unit User
11 - 32 par.
12 - 32 par.
UU Unit User 1
Scaling determines how many quad-counts make
up a user unit.
In CAM-Mode, the parameter is used to fix the unit
for the slave drive so that it is possible to work
with meaningful units in the CAM-Editor. See
example 2.
UU 1 qc
Factor Scaling
4 Resolution Encoder Factor Gearing