ACH550-UH User’s Manual 1-123
Parameters
2304 ACC COMPENSATION 0.00…600.00 s 0.01 s 0.00 s
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 describes the principle of derivative action.
• 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.
*Note: You can use parameter 2305
AUTOTUNE RUN to automatically set acceleration compensation.
2305 AUTOTUNE RUN 0, 1 1 0 (
OFF)
Starts automatic tuning of the speed controller.
0 = OFF – Disables the Autotune creation process. (Does not disable the operation of Autotune settings.)
1 =
ON – Activates speed controller autotuning. Automatically reverts to OFF.
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
ON.
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
OFF.
Group 23: Speed Control
Code Description Range Resolution Default S
Speed reference
Actual speed
* No acceleration compensation
Acceleration compensation
%%
tt
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