Motor data and controller adjustments of the asynchronous motor
© KEB, 2012-10 COMBIVERT F5-A, -E, -H Page 7.5 - 25
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Resolution mode dS.21 max. dS.22
4000 rpm 1/12 rated speed 1 s
8000 rpm 1/12 rated speed 2 s
16000 rpm 1/12 rated speed 4 s
32000 rpm 1/12 rated speed 8 s
64000 rpm 1/12 rated speed 16 s
128000 rpm 1/12 rated speed 32 s
• Leakage inductance:
Measurement of the leakage inductance can lead to wrong values, if the inductance of the motor has a
pronounced current dependence. The current has a „bell-shaped“ curve at setting of sine-wave voltage.
This can often be observed at spindle motors. The magnetising current can be watched via Combivis in
ru.87 during the rotor resistance measurement, to nd out whether the motor to be start up is concerned.
Depending on the deviation of the current from the sine form the inductance is reduced to 85..70% of the
identied value.
• Check current controller adjustments
A correction of the current controller adjustment is eventually necessary if the identied leakage in-
ductance (ds.07) is < 1,4mH:
ds.00 = ds.00_def * 1,0…1,5
ds.01 = ds.01_def * 1,5…2
Control to model currents:
The motor model (dS.04 bit 0) must be active for this. Control to the model current (dS.18 bit 3) has the advan-
tage that disturbances of the measured currents enter ltered to the motor model and thus the calculated model
current and the current control are smoother. The disadvantage is in the danger that the drive could change
to OC when there is a difference between measured and calculated current. Thus pay special attention to the
identication of the equivalent circuit data.
Observer:
The observer (dS.18 bit5) adjusts the model currents dependent on the measured currents by the adjusted
factor in parameter dS.23 „observer factor".
Square-law load torque characteristic:
If the drive shall be accelerated at torque limit, it is mandatory necessary that the max. breakdown torque is not
exceeded. For this parameter (dS.03 bit 1) must be activated and the breakdown torque must be entered at
corner speed (dr.18) in parameter dr.16.
The corner speed (dr.18) should be set to rated speed (dr.01). If the breakdown torque should not be arise from
the data sheet, the breakdown torque must be calculated from the equivalent circuit data.
Rough formula : Mk = 2.0 * Mn
Mk = breakdown torque (dr.16)
Mn = rated torque (dr.14)
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