ABB ACS880 Firmware Manual page 460

460 Parameters
No. Name/Value
90.38 Pos counter
decimals
0...9
90.41 Motor feedback
selection
Estimate
Encoder 1
Encoder 2
90.42 Motor speed filter
time
0 ... 10000 ms
90.43 Motor gear
numerator
-2147483648 ...
2147483647
90.44 Motor gear
denominator
-2147483648 ...
2147483647
90.45 Motor feedback fault
Fault
Warning
Description
Scales the value of parameters
and 90.65 Pos counter init value
to from an external source (e.g. fieldbus). The setting
corresponds to the number of decimal places.
For example, with the value set as 3, an integer value of
66770 written into 90.65 Pos counter init value
1000, so the final value applied is 66.770. Likewise, the
value of 90.05 Load position scaled
when read.
Number of position counter decimal places.
Selects the motor speed feedback value used in control.
Note: With a permanent magnet motor, make sure an
autophasing routine (see page 100) is performed using the
selected encoder. If necessary, set parameter
requested to Autophasing
routine.
A calculated speed estimate generated from the DTC core is
used.
Actual speed measured by encoder 1. The encoder is set up
by the parameters in group
Actual speed measured by encoder 2. The encoder is set up
by the parameters in group
Defines a filter time for motor speed feedback used for
control (90.01 Motor speed for
Motor speed filter time.
Parameters 90.43 and 90.44
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 Motor gear numerator
90.44 Motor gear denominator
Motor gear numerator.
See parameter 90.43 Motor gear
Motor gear denominator.
Selects how the drive reacts to loss of measured motor
feedback.
Drive trips on a 7301 Motor speed feedback
Encoder fault.
Drive generates a A798 Encoder option comm
Motor speed feedback or
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
90.05 Load position scaled
when written from or read
is divided by
is multiplied by 1000
99.13 ID run
to request a fresh autophasing
92 Encoder 1 configuration.
93 Encoder 2 configuration.
control).
define a gear function between
Motor speed
=
Encoder speed
numerator.
or 7381
loss,
A7E1 Encoder warning and
90.41 Motor feedback selection).
Def/FbEq16
3
1 = 1
Estimate
0
1
2
3 ms
1 = 1 ms
1
-
1
-
Fault
0
A7B0 1