Operating Instructions ACU
18.5.4.3 Integral time speed compensation
For speed compensation and in order to increase the speed accuracy, the integrating component of
the speed control can be set via parameter Integral Time Speedtracking 515. The setting is effective
in Operation Modes „4 - Speedtracking EC 1“ and „5 - Speedtracking EC 2“ for Parameter Actual
Speed Source 766.
Integral Time Speedtracking
18.5.5 Acceleration pre-control
The acceleration pre-control is active in the speed-controlled configurations and can be activated via
parameter Operation Mode 725.
The control system is not influenced.
The acceleration pre-control is active according to the limit
values.
The acceleration pre-control controlled parallel to the speed controller reduces the reaction time of
the drive system to a change of reference values. The minimum acceleration time defines the
modification speed of the reference speed value as from which a torque necessary for acceleration
of the drive is pre-controlled. Acceleration of the mass depends on the Mech. Time Constant 727 of
the system. The value calculated from the increase of the reference value and the multiplication
factor of the torque required is added to the output signal of the speed controller.
For optimal setting, the acceleration pre-control is switched on and the mechanical time constant is
set to the minimum value. The output value of the speed controller is compared to the minimum
acceleration time during the acceleration processes. The frequency ramp is to be set to the highest
value occurring in operation at which the output figure of the speed controller is not yet limited.
Now, the value of the Minimum Acceleration 726 is set to half the set acceleration ramp so that it is
ensured that the acceleration pre-control is active. The acceleration pre-control is not raised by
increasing the Mech. Time Constant 727 until the output figure corresponds to the time modification
of the drive mechanism during the acceleration processes.
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