03/12 EM-ABS-01 for ACU 43
6.6.2 Initialize counting direction
First check if the countin
direction of the user units meets the requirements. You can
change the counting direction by inverting the parameter
EC2 Gear Factor Numera-
tor
513 (e.g. by inverting parameter EC2 Gear Factor Numerator 513 from 200.00
to -200.00).
Danger!
By changing parameter EC2 Gear Factor Numerator 513, the encode
values will be re-calculated in the internal user unit format. As a result,
the value of
Act. Position 1108 may chan
e. Especially when software
limit switches are used or in the case of feedback to a PLC, this can result
in warnin
s or application errors. For this reasons, after chan
in
the
parameters of the reference system and the encoder, always check the
ct. Position 1108, considering the permissible travel distance (e.g. Pos.
SW Limit Switch
1145).
6.6.3 Initializing home position
For positionin
application, a certain point of the system is typically defined as the
home position. After checking the correct reference system of the positionin
and
linear encoder (see Chapter 6.6.1) and setting the counting direction, the home posi-
tion can be initialized.
Move
(e.g. in JOG mode) to the required system home position. At this position, stop
the drive. Set parameter
Home Offset 1131 = 0.
Note:
By default,
Home Offset 1131 is set to zero. Upon first commissionin
,
you do not have to chan
e the value, but this step is required in the case
of commissioning following a change.
Now, read the value in parameter
Act. Position 1108. Invert this value. Enter the
inverted
value in Home Offset 1131.
Example:
ct. Position 1108 = 7654 u Æ Home Offset 1131 = - 7654
Once you have set up the home position offset, check the system for correct function
again (see chapter 6.6.1).
If required for the applicati
on,
set up the software limit switches now.
Note: Referencing using an absolute value encoder is not necessary after com-
pletion of first commissioning. The referencing setting
Operation
mode
1220 with setting “10 – No referencin
required” can be used afte
initialization.
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