Motor Power Company DUET_FL 48/10, User Manual

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3.1.2 Current controller
The current controller can be configured under Parameters/Controller parameters/Current
controller in the following menu:
It is essential to adjust the current controller correctly in order to be able to the adapt the speed
controller to the motor used. The parameters to be configured are the gain and the time constant.
Enter the correct parameters. If you are unsure, keep the uncritical values.
Caution!
Incorrect data for the current controller gain and the time constant may lead to oscillations
and - due to temporarily excessive currents - also destroy the motor!
The overcurrent detection system of the servo positioning controller may be activated!
DANGER !
Make sure that the maximum currents and the rated currents of the motor have been
adjusted correctly prior to optimizing the current controller. If the currents are too high, the
motor will be destroyed as the permanent magnets inside the motor will be demagnetised.
The current limits stated by the manufacturer must not be exceeded. (See
chapter 3.1.1
Motor data ).
The current controller can be optimized using the oscilloscope function (see chapter Using the
oscilloscope function ). You can display the step response of the current controller by setting the
oscilloscope channels to the actual value and to the setpoint value of the active current.
Select the Torque control option in the Commands menu and enter a current setpoint. Then try to
adjust the optimum step response by varying the parameters. The following illustration shows a good
step response.
The current should reach the setpoint value within 1 ms and not overshoot by more than 20%. In the
case of motors with a high stator inductance, the current may need more time to reach the setpoint
value. In any case, the transient process should subside in a well-damped manner and without
excessive overshoots.
User Manual DUET_FL „DUET_FL 48/10“ Version 1.1 Motor Power Company