C-208 Parameter Reference
AC30 series Variable Speed Drive
Spd Limiter Torq Ctrl
1781
Parameters::Motor Control::Spd
Loop Settings
FALSE
ALWAYS
When set to TRUE, and the drive is in Torque Control mode, this parameter prevents operation outside the speed limits defined in Spd
Demand Pos Lim and Spd Demand Neg Lim. The torque setpoint is compensated if the motor speed reaches these speed limits.
Functional Description
The speed error (speed demand minus speed feedback) is calculated and processed via a proportional + integral (PI) controller. The output of the
PI controller is a torque demand, which is passed directly to the torque control feature.
When the drive is in SENSORLESS VEC mode, the speed feedback is calculated from the voltages and currents flowing in the motor, and the motor
model.
Speed reference
%
Direct input
Aux torque demand %
Speed limiter
Filter on
Torque
Demand
Speed Feedback Hz
Sel Torq Ctrl Only
Compensated torque reference
PI
Pos torque %
Neg torque %
x (scaling/100)
x 1/100
x 1/100
-300%
300%
300%
-300%
Neg speed Hz
Pos speed Hz
Spd demand Neg Lim %
Spd demand Pos Lim %
-110%
110%
% to Hz :
x ( scaling/100 )
525
526
464
speed
torque
534
x (100/scaling)
x100
535
536
scaling = 100% Speed in RPM/60
Hz
1.0 = 100% Torque
521
anin1
anin2
Volts/amps to %
530
531
Torque
Limit
In torque limit
x100
536
Spd Limiter Active
1781
Spd Limiter Torq Ctrl
1780
TORQUE CONTROL
SPEED CONTROL
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