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 op-
timi
zation of the PI controller should be done at the maximum admissible reference
figure change rate. First, the amplification is increased until the actual value over-
shoots distinctly during the control process. This is indicated by a strong os
cillation 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 (ac-
celeration, deceleration). The frequency at which a switch-over of the controller pa-
rameters is affected can be set via parameter Speed control switch-over limit 738.
17.5.4.1 Limitation of Speed Controller
The output signal of the speed controller is the torque-forming current component
Isq. The output and the I component of the speed controller can be limited via pa-
rameters
Current limit 728, Current limit generator operation 729, Torque limit
730, Torque limit generator operation 731 or Power limit 739, Power limit genera-
tor operation
740. The limits of the proportional component are set via parameter P
component torque upper limit
732 and parameter P component torque lower limit
− The output value of the controller is limited by an upper and a lower current lim-
it, parameter Current limit 728 and parameter Current limit generator opera-
tion
729. The limit figures are entered in Amperes. The current limits of the con-
troller can be linked to the fixed limits and analog input parameters. The assign-
ment is done via the parameters
Isq limit source motor operation 734 and Isq
limit source generator operation 735.
− 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 opera-
tion.
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, generator op. 737.
− 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.
− 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 Power lim-
it
739 and Power limit generator operation. 740
. The power limits are entered
in kW.
234 Operating Instructions ACU 06/13
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