Torque Control - ABB ACS355 User Manual

230 Actual signals and parameters
All parameters
No. Name/Value
2304 ACC
COMPENSATI
ON
0.00...600.00 s Time
2305 AUTOTUNE
RUN
OFF
ON
24 TORQUE
CONTROL
2401 TORQ RAMP
UP
0.00...120.00 s Time
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
The figure below shows the speed responses when a high
inertia load is accelerated along a ramp.
No acceleration
compensation
%
Speed reference
Actual speed
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
GAIN, 2302 INTEGRATION TIME
COMPENSATION
Setting is automatically reverted to OFF.
Torque control variables
Defines the torque reference ramp up time, ie the minimum
time for the reference to increase from zero to the nominal
motor torque.
2303 DERIVATION
RUN.)
Acceleration
compensation
%
t
and 2304 ACC
values).
Def/FbEq
0.00 s
TIME.
t
1 = 0.01 s
OFF
0
1
2301 PROP
0.00 s
1 = 0.01 s