ABB ACS880-104

456 Parameters
90.43 Motor gear
numerator
Parameters 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.
1
-2147483648 …
2147483647
Motor gear numerator. -
90.44 Motor gear
denominator
See parameter 90.43 Motor gear numerator.1
-2147483648 …
2147483647
Motor gear denominator. -
90.45 Motor feedback
fault
Selects how the drive reacts to loss of measured motor
feedback.
Fault
Fault Drive trips on a 7301 Motor speed feedback or 7381 Encoder
fault.
0
Warning 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).
1
90.46 Force open loop Forces 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.
No
No The motor model uses the feedback selected by 90.41 Motor
feedback selection.
0
Yes The motor model uses the calculated speed estimate
(regardless of the setting of 90.41 Motor feedback selection,
which in this case only selects the source of feedback for the
speed controller).
1
90.48 Motor position axis
mode
Selects the axis type for motor position measurement. Rollover
Linear Linear. 0
Rollover The value is between 0 and 1 revolutions, and rolls over at
360 degrees.
1
90.49 Motor position
resolution
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 90.06
Motor position scaled (or for fieldbus).
24
0…31 Motor position resolution. -
90.51 Load feedback
selection
Selects the source of load speed and position feedbacks
used in control.
None
None No load feedback selected. 0
No. Name/Value Description Def/FbEq16
90.43 Motor gear numerator
90.44 Motor gear denominator
Motor speed
Encoder speed
=