24 Torque Control - ABB ACS350 User Manual

Parameters – complete descriptions
Index Name/Selection
2304 ACC
COMPENSATION
0.00...600.00 s
2305 AUTOTUNE RUN
OFF
ON

24 TORQUE CONTROL

2401 TORQ RAMP UP
0.00...120.00 s
2402 TORQ RAMP DOWN
0.00...120.00 s
Description
Defines the derivation time for acceleration/(deceleration) compensation. In
order to compensate inertia during acceleration a derivative of the reference
is added to the output of the speed controller. The principle of a derivative
action is described for parameter
Note: As a general rule, set this parameter to the value between 50 and
100% of the sum of the mechanical time constants of the motor and the
driven machine. (The speed controller Autotune Run does this automatically,
see parameter 2305 AUTOTUNE RUN.)
The figure below shows the speed responses when a high inertia load is
accelerated along a ramp.
* No acceleration compensation
%
Time
Start automatic tuning of the speed controller. Instructions:
- Run the motor at a constant speed of 20 to 40% of the rated speed.
- Change the autotuning parameter 2305 to ON.
Note: The motor load must be connected to the motor.
No autotuning
Activates the speed controller autotuning. The drive
- accelerates the motor.
- calculates values for proportional gain, integration time and acceleration
compensation (parameter
2304 ACC COMPENSATION values).
Setting is automatically reverted to OFF.
Torque control variables
Defines the torque reference ramp up time, i.e the minimum time for the
reference to increase from zero to the nominal motor torque.
Time
Defines the torque reference ramp down time, i.e the minimum time for the
reference to decrease from the nominal motor torque to zero.
Time
2303 DERIVATION TIME.
Acceleration compensation
%
Speed reference
Actual speed
t
2301 PROP GAIN, 2302 INTEGRATION TIME and
Def, FbEq
0
t
1 = 0.01 s
OFF
0
1
0
1 = 0.01 s
0
1 = 0.01 s
Actual signals and parameters
191