Motor data and controller adjustments of the synchronous motor
© KEB, 2012-10 COMBIVERT F5-A, -E, -H Page 7.6 - 3
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7.6 Adjustments of the synchronous motor
There are two different operating modes for the synchronous motor:
- Speed-controlled operation with encoder feedback
Default speed-controlled operation with encoder feedback, standard version F5A–S
- Speed-controlled operation without encoder feedback
Speed-controlled operation of synchronous motors without encoder feedback SCL (sensorless closed loop)
is only possible if the electrical characteristic data of the motor are known. The rotor position is emulated by
means of a mathematical model of the synchronous motor. Speed control is based on a speed calculated from
the rotor position rather than on the encoder feedback.
Standard version F5A-S does not contain operating mode SCL. It needs the special software F5E–S.
7.6.1 Initial settings
The following adjustments are always necessary in speed-controlled operation, independently with or without
encoders:
7.6.1.1 Motor name plate
Input of the motor rating plate data is at the beginning of each start-up:
- dr.23 DSM rated current
- dr.24 DSM rated speed
- dr.25 DSM rated frequency
- dr.27 DSM rated torque
- dr.28 DSM rated motor current
The following equivalent circuit data can be taken from the data sheet.
Identication of the data offers a high accuracy and acquires the additional line resistance. The identication
can be executed as described in chapter 7.6.3.3 (SCL).
- dr.26 DSM EMC voltage constant
- dr.30 DSM stator resistance
- dr.31 DSM Inductance
- dr.64 DSM winding inductance Luv maximum value
For SCL, also F5S eventually. Apart from the minimum value in dr.31 also the maximum value can be preset
from version 4.2. This parameter is also preset by the identication of the winding inductance.
First, it is only required for the calculation of the controller for the RF injection. (Normally the higher value of
inductance should be set in the q-component in dr.31. Motor model and current controller are however better
preset with the lower value. Servo motor manufacturer, as Wittur also indicate the lower value of inductance
as luv).
DSM EMC voltage constant (dr.26, dr.63)
EMC is the induced voltage in no-load operation and must be entered as peak value (phase-phase) correspon-
ding to 1000 rpm.
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