ACH550-UH User’s Manual 91
Start-Up
2304 ACC COMPENSATION 0.00…600.00 s 0.01 s 0.00
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.
2305 AUTOTUNE RUN 0…1 1 0
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 and integration time.
• Changes parameters 2301 and 2302 to these values.
• Resets 2305 to
OFF.
Group 23: Speed Control
Code Description Range Resolution Default S
No Acceleration Compensation
t
%
Speed reference
Actual speed
t
%
Acceleration Compensation
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