ABB ACS880-104

Parameters 457
Encoder 1 Load feedbacks are updated based on the speed and
position values read from encoder 1.
The values are scaled by the load gear function (90.53 Load
gear numerator and 90.54 Load gear denominator).
The encoder is set up by the parameters in group 92 Encoder
1 configuration.
1
Encoder 2 Load feedbacks are updated based on the speed and
position values read from encoder 2.
The values are scaled by the load gear function (90.53 Load
gear numerator and 90.54 Load gear denominator).
The encoder is set up by the parameters in group 93 Encoder
2 configuration.
2
Estimate Calculated speed and position estimates are used. The
values are scaled from the motor side to the load side using
the inverted ratio between 90.61 Gear numerator and 90.62
Gear denominator (ie. 90.62 divided by 90.61).
3
Motor feedback The source selected by parameter 90.41 Motor feedback
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 90.61 Gear numerator and 90.62 Gear denominator
(ie. 90.62 divided by 90.61).
4
90.52 Load speed filter
time
Defines a filter time for load speed feedback (90.03 Load
speed).
4 ms
0 … 10000 ms Load speed filter time. -
90.53 Load gear
numerator
Parameters 90.53 and 90.54 define a gear function between
the load (ie. driven equipment) speed and the encoder
feedback selected by parameter 90.51 Load 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.
1
-2147483648 …
2147483647
Load gear numerator. -
90.54 Load gear
denominator
See parameter 90.53 Load gear numerator.1
-2147483648 …
2147483647
Load gear denominator. -
90.55 Load feedback fault Selects how the drive reacts to loss of load feedback. Fault
Fault Drive trips on a 73A1 Load feedback fault. 0
Warning Drive generates an A798 Encoder option comm loss or A7B1
Load speed feedback warning and continues operation using
estimated feedbacks.
1
90.56 Load position offset Defines a load-side position offset. The resolution is
determined by parameter 90.57 Load position resolution.
0 rev
-2147483648 …
2147483647 rev
Load-side position offset. -
No. Name/Value Description Def/FbEq16
90.53 Load gear numerator
90.54 Load gear denominator
Load speed
Encoder speed
=