Danfoss VLT 5000 Series Manual page 139

26 POSFACT_N
All path information in motion commands are
made in user units and are converted to quad-
counts internally. By choosing these scaling units
correspondingly 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.
1 User unit = POSFACT_Z / POSFACT_N
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.
Content
Denominator user factor
Parameter Group
AXE
Value range
1 ... MLONG
27 ENCODERTYPE
This parameter determines the type of encoder:
incremental or absolute.
Content
Type of encoder for encoder 0 (Slave)
Parameter Group
AXE
Value range
0 ... 2
0 = Incremental encoder
1 = Absolute encoder, standard ca. 262 kHz
2 = Absolute encoder, ca. 105 kHz
NB!
When selecting 1 or 2 (absolute encoder) the
following commands can not be used: DEF
ORIGIN, HOME, INDEX, IPOS, MIPOS and
WAITNDX.
The use of SYNCM should be avoided as it will not
function correctly.
MG.10.J4.02 – VLT is a registered Danfoss trade mark
®
VLT 5000 SyncPos option
28 POSDRCT
POSDRCT defines the positive direction of rotation
in relation to the motor axis as seen from behind.
By turning the shaft it can be determined whether
the direction of rotation is correct. In the case of a
right-hand rotation looking from the front at the
end of the shaft, the encoder must count upwards.
Now you can define an increase in the position
during a right-hand rotation with "1" and an in-
crease in the position during a left-hand rotation
with "-1".
If the opposite direction of rotation is the case, you
can now achieve the same effect with "2" and "-2"
without, changing the wiring (turning around the
motor leads or exchanging the A and B tracks in
the encoder).
Content
Direction of rotation
# 1000
Parameter Group
AXE
Value range
–2 ... 2
When right-hand rotations reports positive values:
1 = position increases during right-hand rotation
= a positive desired value results in positive
encoder values,
POSA 10000 = position 10000
– 1 = position increases during left-hand rotation =
a positive desired value results in positive
encoder values, which, however, are displayed
negatively;
POSA 10000 = position –10000
# 0
When right-hand rotations reports negative values:
2 = position increases during right-hand rotation
= a positive desired value results in positive
encoder values,
POSA 10000 = position 10000
– 2 = position increases during left-hand rotation =
a positive desired value results in positive
encoder values, which, however, are displayed
negatively;
POSA 10000 = position –10000
# 1
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