5motor control (mctrl) – Lenze 8400 motec User Manual
Page 137
Lenze · 8400 motec · Reference manual · DMS 4.1 EN · 08/2013 · TD05
137
5
Motor control (MCTRL)
5.9
Sensorless control for synchronous motors (SLPSM)
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Speed controller reset time Ti
Apart from setting the P component,
provides the possibility to take influence on the I
component of the PI controller.
If the mass inertia of the drive is unknown, the optimisation can be achieved as follows:
1. Specify speed setpoint.
2. Reduce Ti (
) until the drive starts to oscillate (observe engine noise).
3. Increase Ti (
) until the drive runs stable again.
4. Increase Ti (
) to approx. twice the value.
Tip!
Value range recommended by Lenze for the setting of the reset time:
Ti = 20 ms … 150 ms
Using the ramp response for setting the speed controller
If the mechanical components cannot be operated at the stability limit, the ramp response can also
be used for setting the speed controller.
Stop!
If the controller parameters are preset unfavourably, the control can tend to heavy
overshoots up to instability!
• Following and speed errors can adopt very high values.
• If the mechanics are sensitive, the corresponding monitoring functions are to be
activated.
Note!
For an optimal setting, we recommend to determine the mass inertia (optimal response
to setpoint changes) first.