8400 StateLine C | Reference manual
Motor control (MCTRL)
Parameterisable additional functions
198 L Firmware ≤ 11.00 - DMS 8.0 EN - 10/2011
5.9.3 Correction of the stator leakage inductance...
...and the current controller parameters by means of the saturation characteristic
The current controller must be adjusted to the electrical characteristics of the motor stator
resistance (C00084
) and stator leakage inductance (C00085). In case of modern motors, the
stator leakage inductance changes with the height of the current so that a new current
controller setting is required for each current height.
When the motor is operated with very low and very high currents (e.g. in Pick and place
applications), it is not always possible to achieve a satisfactory current controller setting
for all operating points. For this purpose, the correction of the stator leakage inductance
and current controller parameters is now possible via an adjustable saturation
characteristic that can be set in C02853
(17 interpolation points).
The following picture shows a typical saturation characteristic of an MCS motor:
[5-16] Saturation characteristic: Inductance referring to the inductance for rated current
When a Lenze motor is selected from the »Engineer« motor catalogue, the saturation
characteristic will also be loaded and switched on if required.
The correction by means of this saturation characteristic can be switched on/off via
C02859
.
If instabilities of the current controller occur when a third-party motor is used at high
currents, ask the motor manufacturer whether the stator leakage inductance changes
with the current height. If required, the saturation characteristic of this motor must be
set and switched on.
Note!
Function only available for sensorless control for synchronous motors (SLPSM)
(from version 10.00.00).
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