ABB ACS880 Firmware Manual page 51

Position counter
The control program contains a position counter feature that can be used to indicate
the position of the load. The output of the counter function, parameter
position scaled int, indicates the scaled number of revolutions read from the selected
source (see section
The relation between revolutions of the motor shaft and the translatory movement of
the load (in any given unit of distance) is defined by parameters
numerator and 90.64 Feed constant
without the need of a parameter refresh or position counter reinitialization – however,
the counter output is only updated after new position input data is received.
For detailed parameter connections of the load feedback function, see the block
diagram on page 578.
(Proximity switch) Source set by
(Initialization inhibit) Source set by
90.35 Pos counter status
bit 4, Pos counter init ready
90.35 Pos counter status
bit 5, Position counter re-init disabled
(Re-init request) Source set by
90.07 Load position scaled int
(Initial value) Source set by
(by default, 90.58)
The position counter is initialized by setting a known physical position of the load into
the control program. The initial position (for example, the home/zero position, or the
distance from it) can be entered manually in a parameter
value int), or taken from another parameter. This position is set as the value of the
position counter (90.07 Load position scaled
Pos counter init cmd
activated. A successful initialization is indicated by bit 4 of
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Load and motor feedback
denominator. This gear function can be changed
1
90.67
0
1
90.68
0
1
0
1
0
1
90.69
0
1
Drive fault
0
+2147483
0
90.59
-2147483 8
source, such as a proximity switch connected to a digital input, is
Program features 51
on page 50).
90.63 Feed constant
(90.58 Pos counter init
int) when the source selected by
90.35 Pos counter
90.07 Load
90.67
status.