ABB ACS880 - Page 476

Def / Type
FbEq 16b / 32b
DescriptionName / Range /
Selection
No.
3 / uint16
Scales the values of parameters 90.5 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 90.5 Load position scaled is multiplied by 1000
when read.
Pos counter decimals90.38
1 = 1 / 1 = 1Number of position counter decimal places.0...9
Estimate / uint16Selects the motor speed feedback value used during motor
control.
Note: With a permanent magnet motor, make sure an
autophasing routine (see page 64) is performed using the
selected encoder. If necessary, set parameter 99.13 ID
run requested to Autophasing to request a fresh
autophasing routine.
Motor feedback
selection
90.41
0A calculated speed estimate generated from the DTC core
is used.
Estimate
1Actual speed measured by encoder 1. The encoder is set
up by the parameters in group 92 Encoder 1 configuration.
Encoder 1
2Actual speed measured by encoder 2. The encoder is set
up by the parameters in group 93 Encoder 2 configuration.
Encoder 2
3 ms / real32Defines a filter time for motor speed feedback used for
speed control (90.1 Motor speed for control).
Motor speed filter time90.42
1 = 1 ms / 1 = 1 msMotor speed filter time.0...10000 ms
1 / int32
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.
90.43
90.44
=
Motor speed
Encoder speed
See also section Load and motor feedback (page 55).
Note: This parameter cannot be changed while the drive
is running.
Motor gear numerator90.43
- / -Motor gear numerator.-2147483648...2147483647
1 / int32
See parameter 90.43 Motor gear numerator.
Note: This parameter cannot be changed while the drive
is running.
Motor gear
denominator
90.44
- / -Motor gear denominator.-2147483648...2147483647
Fault / uint16Selects how the drive reacts to loss of measured motor
feedback.
Motor feedback fault90.45
0
Drive trips on a 7301 Motor speed feedback or 7381
Encoder fault.
Fault
476 Parameters