ABB ACS880 Firmware Manual page 571

No. Name / Range /
Selection
90.49 Motor position
resolution
0...31
90.51 Load feedback
selection
None
Encoder 1
Encoder 2
Estimate
Motor feedback
90.52 Load speed filter
time
0...10000 ms
90.53 Load gear
numerator
Description
Defines how many bits are used for motor position
count within one revolution. For example, with the
setting of 24, the position value is multiplied by
16777216 for display in parameter
scaled (or for fieldbus).
Motor position resolution.
Selects the source of load speed and position
feedbacks used in control.
No load feedback selected.
Load feedbacks are updated based on the speed and
position values read from encoder 1.
The values are scaled by the load gear function
Load gear numerator and
denominator).
The encoder is set up by the parameters in group
Encoder 1 configuration.
Load feedbacks are updated based on the speed and
position values read from encoder 2.
The values are scaled by the load gear function
Load gear numerator and
denominator).
The encoder is set up by the parameters in group
Encoder 2 configuration.
Calculated speed and position estimates are used. The
values are scaled from the motor side to the load side
using the inverted ratio between
and 90.62 Gear denominator
The source selected by parameter
selection for motor feedback is also used for load
feedback.
Any difference between the motor and load speeds
(and positions) can be compensated by using the
inverted ratio between
Gear denominator (ie.
Defines a filter time for load speed feedback
speed).
Load speed filter time.
Parameters 90.53 and
between the load (ie. driven equipment) speed and the
encoder feedback selected by parameter
feedback selection. The gear can be used to correct a
difference between the load and encoder speeds for
example if the encoder is not mounted directly on the
rotated machinery.
Load speed
90.53
=
90.54 Encoder speed
See also section Load and motor feedback (page
Note: This parameter cannot be changed while the
drive is running.
90.6 Motor position
90.54 Load gear
90.54 Load gear
90.61 Gear numerator
(ie. 90.62 divided by 90.61).
90.41 Motor feedback
90.61 Gear numerator and
90.62 divided by 90.61).
(90.3 Load
90.54 define a gear function
90.51 Load
Parameters 571
Def / Type
FbEq 16b / 32b
24 / uint16
- / -
None / uint16
0
1
(90.53
92
2
(90.53
93
3
4
90.62
4 ms / real32
- / -
1 / int32
93).