Lenze 931E/K Small Drives Control - Manual (Page 144)

Appendix
Parameterisation of outside motors
Current controller
10
l
144 SW−HB 13.0002−EN 4.1
10.1.8 Current controller
Select the menu Parameters
W Controller parameters W Current controller to select the
current controller settings:
931e_290
The speed controller can only be adjusted to the selected motor, if the current controller
settings (gain factor and time constant) are correct.
Correctly enter the parameters. If you are not sure about the values, do not change the
uncritical values.
(
Stop!
ƒ Incorrect current controller gain and time constant data may lead to
vibrations and short−time overcurrents that may destroy the motor!
ƒ The overcurrent detection of the servo positioning controller may respond!
ƒ The current controller may only be optimised when the maximum and rated
motor currents have been set correctly. If the currents are too high, the
motor will be destroyed because the permanent magnets in the motor are
demagnetised. For this reason, the current limits specified by the
manufacturer must not be exceeded. See the chapter "Motor data".
(
¶ 133).
)
Note!
When selecting a motor from the motor database, you can use optimised
current controller settings. In this case, the current controller settings need not
be changed.
The oscilloscope function can be used to optimise the current controller. For more
information, please see the chapter "Using the oscilloscope function". (
¶ 115)
Set the oscilloscope channels to the actual active current and the active current setpoint
to display the step response of the current controller.
Activate Torque control in the Commands menu and select a current setpoint. Then try to
set the optimum step response by varying the parameters. The following plot shows a
good step response.
The current should reach the setpoint within 1 msec and maximally overshoot 20 %. With
motors with a high stator inductance it may take longer until the current reaches the
setpoint. In all cases, the transient reaction should decay without high overshoots and
well−damped.