Danfoss MCO 305 Design Manual page 204

MCO 305 Design Guide
32-09 Encoder Monitoring
ENCODERMONITORING
Option
Off
3 Channels
2 Channels
Function
Monitoring of open- and short-circuit of the enco-
der inputs can be enabled or disabled.
Select Off [0] if hardware monitoring not is
required.
Select [1] if all 3 channels A,B, and Index should
be monitored.
Select [2] if 2 channels A,B should be monitored.
An encoder error will issue error code 192.
32-10 Rotational Direction
POSDRCT
Option
No action
Reference reversed
User units reversed (–1)
UU and Reference reversed (–2)
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).
default setting
204
__ Parameter Reference __
[0]
[1]
[2]
[1]
[2]
[3]
[4]
[ ] value for use in communication via serial communication port
®
MG.33.L5.02 – VLT is a registered Danfoss trademark
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
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 numera-
tor and denominator.
par. 32 - 12
1 User Unit UU =
par. 32 - 11
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.
Gearing Factor ∗ Encoder
Scaling Factor
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.
The factor is no longer limited to small values
starting with version MCO 5.00, see also User Units
in chapter „How to read the Design Guide".
32-12 User Unit Numerator
POSFACT_Z
Range
1 – MLONG/max. position (UU)
Function
User Unit Numerator
User Unit Denomintor
Resolution ∗ 4
qc = 1 UU
1
1