ABB ACS880 - Page 477

Def / Type
FbEq 16b / 32b
DescriptionName / Range /
Selection
No.
1
Drive generates an A798 Encoder option comm loss, A7B0
Motor speed feedback or A7E1 Encoder warning and
continues operation using estimated feedbacks.
Note: Before using this setting, test the stability of the
speed control loop with estimated feedback by running the
drive on estimated feedback (see 90.41 Motor feedback
selection).
Warning
No / uint16Forces the DTC motor model to use estimated motor speed
as feedback. This parameter can be activated when the
encoder data is obviously unreliable because of slippage,
for example.
Note: This parameter only affects the selection of feedback
for the motor model, not for the speed controller.
Force open loop90.46
0
The motor model uses the feedback selected by 90.41
Motor feedback selection.
No
1The motor model uses the calculated speed estimate
(regardless of the setting of 90.41 Motor feedback
selection, which in case only selects the source of feedback
for the speed controller).
Yes
Rollover / uint16Selects the axis type for motor position measurement.Motor position axis
mode
90.48
0Linear.Linear
1The value is between 0 and 1 revolutions, and rolls over
at 360 degrees.
Rollover
24 / uint16Defines 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 90.6 Motor position scaled (or for fieldbus).
Motor position
resolution
90.49
- / -Motor position resolution.0...31
None / uint16Selects the source of load speed and position feedbacks
used in control.
Load feedback
selection
90.51
0No load feedback selected.None
1Load 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.
Encoder 1
2Load 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.
Encoder 2
3Calculated 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).
Estimate
Parameters 477