ABB ACS880 ESP, Firmware Manual

Page: 322 / 494

322 Parameters
90.38 Pos counter decimals Scales the values of parameters 90.05 Load position
scaled and 90.65 Pos counter init value when written from
or read to 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. 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
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.
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 1 fault.
0
Warning Drive generates a 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 Defines the speed feedback used by the DTC motor
model. No
No The motor model uses the feedback selected by 90.41
Motor feedback selection .
0
No. Name/Value Description Def/
FbEq16
90.43 Motor gear numerator
90.44 Motor gear denominator
Motor speed
Encoder speed
=