Operating Instructions ACU
Speed Control Switch-Over Limit
1)
The default setting is relative to the recommended machine data for the amplification and
integral time. This enables a first function test in a large number of applications. Switch-over
between settings 1 and 2 for the current frequency range is done by the software according to
the selected limit value.
The optimization of the speed controller can be done with the help of a reference value leap. The
amount of the leap is defined by the set ramp or limitation. The optimization of the PI controller
should be done at the maximum admissible reference figure change rate. First, the amplification is
increased until the actual value overshoots distinctly during the control process. This is indicated by
a strong oscillation of the speed and by the running noises. In the next step, reduce the
amplification slightly (1/2 ...3/4 etc.). Then reduce the integral time (larger I component) until the
actual value overshoots only slightly in the control process.
If necessary, check the speed control settings in the case of dynamic operations (acceleration,
deceleration). The frequency at which a change-over of the controller parameters takes place can be
set via the parameter Speed Control Switch-Over Limit 738.
18.5.4.1 Limitation of speed controller
The output signal of the speed controller is the torque-forming current component Isq. The output
and the I portion of the speed controller can be limited via parameters Current Limit 728, Current
Limit Generator Op. 729, Torque Limit 730, Torque Limit Generator Operation 731 and Power
Limit 739, Power Limit Generator Operation 740. The limits of the proportional portion are set via
parameters P-Comp. Torque Upper Limit 732 and P-Comp. Torque Lower Limit 733.
ï€ The output value of the controller is limited by an upper and a lower current limit, parameters
Current Limit 728 and Current Limit Generator Op. 729. The limit figures are entered in
Amperes. The current limits of the controller can be linked to the fixed limits and analog input
parameters. The assignment is done via the parameters Isq Limit Source Motor Operation 734
and Isq Limit Source Generator Op. 735.
ï€ The output value of the controller is limited by an upper and a lower torque limit, parameter
Torque Limit 730 and parameter Torque Limit Generator Operation 731. The limit values are
input as a percentage of the rated motor torque. The assignment of fixed values or analog limit
values is done via the parameters Torque Limit Source Motor Op. 736 and Torque Limit Source
Gen. Op. 737.
ï€ The output value of the P component is limited with parameter P-Comp. Torque Upper Limit
732 and P-Comp. Torque Lower Limit 733. The limit values are input as torque limits as a
percentage of the rated motor torque.
ï€ The power output by the motor is proportional to the product of speed and torque. This output
power can be limited at the controller output with a Power Limit 739 and Power Limit
Generator Operation 740. The power limits are entered in kilowatt.
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