ABB ACS880 - Page 570

Def / Type
FbEq 16b / 32b
DescriptionName / Range /
Selection
No.
1 / int32Parameters 90.43 and 90.44 define a gear function
between the motor speed feedback and motor control.
The gear is used to correct a difference between the
motor and encoder speeds for example if the encoder
is not mounted directly on the motor shaft.
90.43
90.44
=
Motor speed
Encoder speed
See also section Load and motor feedback (page 93).
Note: This parameter cannot be changed while the
drive is running.
Motor gear
numerator
90.43
- / -Motor gear numerator.-2147483648...2147483647
1 / int32See parameter 90.43 Motor gear numerator.
Note: This parameter cannot be changed while the
drive is running.
Motor gear
denominator
90.44
- / -Motor gear denominator.-2147483648...2147483647
Fault / uint16Selects how the drive reacts to loss of measured motor
feedback.
Motor feedback
fault
90.45
0Drive trips on a 7301 Motor speed feedback or 7381
Encoder fault.
Fault
1Drive 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
0The 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
570 Parameters