6.2.2.2 Equivalent circuit data
Stator resistance Rs in Ohm
Rotor resistance Rr in % of the stator resistance
Stator leakage inductance in mH
Rotor leakage inductance in % of the stator leakage
Speed when main inductance is identified (automati-
cally preset) in% of rated speed
Starts the identification
Displays current measurement or status message
(e.g. "stator resistance“ "ready“ or "error“)
Parameters dr17, dr18, dr19, dr21 and dr22 can be taken from a data sheet or au-
tomatically determined by the identification.
Especially the main inductance should be always identified, since it is dependent
on the magnetising current and the data sheet value is possibly valid for another
current. For identification of main inductance the motor must be able to turn freely
without load.
The speed for identification is determined by dr44. This value must be changed
only if the application (e.g.) requires a lower speed limit.
During the identification steps at standstill the motor may be moved slightly by the
test signals.
Figure 66: Equivalent circuit diagram motor
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