ABB ACS880 - Page 478

Def / Type
FbEq 16b / 32b
DescriptionName / Range /
Selection
No.
4
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).
Motor feedback
4 ms / real32
Defines a filter time for load speed feedback (90.3 Load
speed).
Load speed filter time90.52
- / -Load speed filter time.0...10000 ms
1 / int32
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.
90.53
90.54
=
Load speed
Encoder speed
See also section Load and motor feedback (page 55).
Note: This parameter cannot be changed while the drive
is running.
Load gear numerator90.53
- / -Load gear numerator.-2147483648...2147483647
1 / int32
See parameter 90.53 Load gear numerator.
Note: This parameter cannot be changed while the drive
is running.
Load gear
denominator
90.54
- / -Load gear denominator.-2147483648...2147483647
Fault / uint16Selects how the drive reacts to loss of load feedback.Load feedback fault90.55
0
Drive trips on a 73A1 Load position feedback fault.
Fault
1
Drive generates an A798 Encoder option comm loss or
A7B1 Load speed feedback warning and continues
operation using estimated feedbacks.
Warning
- / int32Defines a load-side position offset. The resolution is
determined by parameter 90.57 Load position resolution.
Load position offset90.56
- / -Load-side position offset.-2147483648...2147483647
rev
16 / uint16Defines how many bits are used for load position count
within one revolution. For example, with the setting of 18,
the position value is multiplied by 65536 for display in
parameter 90.4 Load position.
Load position
resolution
90.57
- / -Load position resolution.0...31
- / int32Defines an initial position (or distance) for the position
counter (as an integer value) when parameter 90.59 Pos
counter init value int source is set to Pos counter init value
int.
See also section Position counter (page 56).
Pos counter init value
int
90.58
- / -Initial integer value for position counter.-2147483648...2147483647
478 Parameters