ABB ACS880 Firmware Manual page 388

388 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
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Description
Scales the values of parameters
and 90.65 Pos counter init value
from an external source (eg. fieldbus). The setting
corresponds to the number of decimal places.
For example, with the setting of 3, an integer value of 66770
written into 90.65 Pos counter init value
the final value applied will be 66.770. Likewise, the value of
90.05 Load position scaled
Number of position counter decimal places.
Selects the motor speed feedback value used during motor
control.
Note: With a permanent magnet motor, make sure an
autophasing routine (see page 59) 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 control).
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
See also section Load and motor feedback
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
fault.
Drive generates an A798 Encoder option comm
Motor speed feedback or A7E1 Encoder
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
90.05 Load position scaled
when written from or read to
is divided by 1000, so
is multiplied by 1000 when read.
99.13 ID run
to request a fresh autophasing
92 Encoder 1 configuration.
93 Encoder 2 configuration.
define a gear function between
Motor speed
=
Encoder speed
(page 50).
numerator.
or 7381 Encoder
loss,
warning and
selection).
Def/FbEq16
3
1 = 1
Estimate
0
1
2
3 ms
1 = 1 ms
1
-
1
-
Fault
0
A7B0 1