Page 7.5 - 14 COMBIVERT F5-A, -E, -H © KEB, 2012-10
Motor data and controller adjustments of the asynchronous motor
This setting is only possible for open-loop V/f-characteristic operation (for software type F5-A) or for control via
motor model (for software type F5-H and F5-E, respectively).
cS.01 actual source
Bit Description Value Function
0...1 Actual source
0: Channel 1 Control to measured speed (via encoder interface 1)
1: Channel 2 Control to measured speed (via encoder interface 2)
2: Calculated actual va-
lue
Control to calculated speed (from motor model)
2 System inversion
0: off
Activates the system inversion
4: An
With activation of the system inversion it is reached that the motor with selected rotation direction "forward"
(e.g. by setpoint- or rotation setting) has the physically direction "reverse" respectively at setting "reverse" the
physical rotation "forward". Precondition is a correct wiring of motor and speed feedback (if available).
One possible application of this function is, e.g., the deployment of 2 drive units, where facing motors drive the
same shaft. If system inversion is activated for a drive, the same setpoint can be set for both via a control, even
if one motor rotates clockwise and the other counter clockwise.
For applications with encoder feedback, the same function can be activated by switching on system inversion
in parameter Ec.06 (see chapter 7.11).
7.5.2.2 Vector controlled operation without motor model
For motors that don´t allow identication of the motor data (e.g. no-load operation of the motor not realisable),
vector controlled operation without motor model must be selected.
Parameters dr.06...dr.10 have no function in speed-controlled operation without motor model. If the drive shall
be operated with motor model, chapter 7.5.2.2 can be skipped.
7.5.2.2.1 DASM rated speed
The slip is affected signicantly by the rated speed in speed-controlled operation without motor model. If the
drive requires too much current for a certain load, or if is can be seen that the output voltage at high load gets
too small, an incorrect (too low) rated speed may be the cause.
In this case, the rated speed must be adjusted in small increments until the optimum is found.
7.5.2.2.2 Flux reductionintheeldweakeningrange
Since the motor voltage is proportional to frequency * ux, the ux must be lowered according to a 1/x function
above the rated point (maximum voltages reached) to keep the voltage constant.
In the base speed range of the motor, the maximum torque is limited by the current the inverter is able to supply.
In the eld weakening range, the achievable torque is additionally limited by the voltage.
Since the motor parameters, like main inductance, change in the eld weakening range, the ux does not follow
the desired 1/x-characteristic during control without motor model in the eld weakening range.
This change in the main inductance can partially be compensated for with the default setting of the amplication
factor eld weakening (dr.20) of 1.2 instead of 1.
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