ABB ACSM1 Firmware Manual page 119

0...10 s
28.05 DERIV FILT TIME
Defines the derivation filter time constant.
0...1000 ms
28.06 ACC COMPENSATION
Selects the source for the acceleration compensation torque.
The default value is P.3.7, i.e signal
ERROR firmware block.
Note: This parameter has been locked, i.e. no user setting is possible.
Value pointer: Group and index
28.07 DROOPING RATE
Defines the droop rate (in percent of the motor nominal speed). The drooping slightly decreases the
drive speed as the drive load increases. The actual speed decrease at a certain operating point
depends on the droop rate setting and the drive load (= torque reference / speed controller output). At
100% speed controller output, drooping is at its nominal level, i.e. equal to the value of this parameter.
The drooping effect decreases linearly to zero along with the decreasing load.
Drooping rate can be used e.g. to adjust the load sharing in a Master/Follower application run by
several drives. In a Master/Follower application the motor shafts are coupled to each other.
The correct droop rate for a process must be found out case by case in practice.
Speed decrease = Speed controller output · Drooping · Max. speed
Example: Speed controller output is 50%, drooping rate is 1%, maximum speed of the drive is 1500 rpm.
Speed decrease = 0.50 · 0.01 · 1500 rpm = 7.5 rpm.
Motor speed (% of nominal)
100%
0...100%
28.08 BAL REFERENCE
Defines the reference used in the speed control output balancing, i.e. an external value to be forced to
the output of the speed controller. In order to guarantee smooth operation during output balancing, the
speed controller D-part is disabled and the acceleration compensation term is set to zero.
The source for the balancing enable signal is selected by parameter
-1600...1600%
28.09 SPEEDCTRL BAL EN
Selects the source for the speed control output balancing enable signal. See parameter
REFERENCE. 1 = Enabled. 0 = Disabled.
Derivation time for speed controller.
FW block: SPEED CONTROL
Derivation filter time constant.
FW block: SPEED CONTROL
3.07 ACC COMP TORQ, which is the output of the
FW block: SPEED CONTROL
No drooping
} 28.07 DROOPING RATE
Speed controller
output / %
100%
Droop rate.
FW block: SPEED CONTROL
Speed control output balancing reference.
FW block: SPEED CONTROL
(see above)
(see above)
(see above)
Drive
load
(see above)
28.09 SPEEDCTRL BAL
(see above)
Parameters and firmware blocks
119
SPEED
EN.
28.08 BAL