ABB ACS550 User Manual page 134

134
Code Description
2304 ACC COMPENSATION
Sets the derivation time for acceleration compensation.
• Adding a derivative of the reference to the output of the speed controller compensates for inertia during
acceleration.
• 2303
DERIVATION TIME
• Rule of thumb: Set this parameter between 50 and 100% of the sum of the mechanical time constants for the motor
and the driven machine.
• The figure shows the speed responses when a high inertia load is accelerated along a ramp.
* No acceleration compensation
%
*Note: You can use parameter 2305
2305 AUTOTUNE RUN
Starts automatic tuning of the speed controller.
0 = – Disables the Autotune creation process. (Does not disable the operation of Autotune settings.)
OFF
1 = – Activates speed controller autotuning. Automatically reverts to
ON
Procedure:
Note: The motor load must be connected.
• Run the motor at a constant speed of 20 to 40% of the rated speed.
• Change the autotuning parameter 2305 to
The drive:
• Accelerates the motor.
• Calculates values for proportional gain, integration time and acceleration compensation.
• Changes parameters 2301, 2302 and 2304 to these values.
• Resets 2305 to
Parameters
describes the principle of derivative action.
t
AUTOTUNE RUN
ON
.
OFF
Acceleration compensation
%
to automatically set acceleration compensation.
OFF
.
ACS550 User's Manual
Speed reference
Actual speed
t
.