ABB ACS880-17 - Page 393

Parameters 393
90.38 Pos counter
decimals
Scales the values of parameters 90.05 Load position scaled
and 90.65 Pos counter init value when accessed 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 is divided by 1000, so
the final value applied will be 66.770. Likewise, the value of
90.05 Load position scaled is multiplied by 1000 when read.
3
0…9 Number of position counter decimal places. 1 = 1
90.41 Motor feedback
selection
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 99.13 ID run
requested to Autophasing to request a fresh autophasing
routine.
Estimate
Estimate A calculated speed estimate generated from the DTC core is
used.
0
Encoder 1 Actual speed measured by encoder 1. The encoder is set up
by the parameters in group 92 Encoder 1 configuration.
1
Encoder 2 Actual speed measured by encoder 2. The encoder is set up
by the parameters in group 93 Encoder 2 configuration.
2
90.42 Motor speed filter
time
Defines a filter time for motor speed feedback used for speed
control (90.01 Motor speed for control).
3 ms
0 … 10000 ms Motor speed filter time. 1 = 1 ms
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.
See also section Load and motor feedback (page 50).
Note: This parameter cannot be changed while the drive is
running.
1
-2147483648 …
2147483647
Motor gear numerator. -
90.44 Motor gear
denominator
See parameter 90.43 Motor gear numerator.
Note: This parameter cannot be changed while the drive is
running.
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
No. Name/Value Description Def/FbEq16
90.43 Motor gear numerator
90.44 Motor gear denominator
Motor speed
Encoder speed
=