2 General conditions of operation
G120X commissioning guide for permanent magnet motors PMSM
Entry-ID: 109780815, V1.0, 07/2020
© Siemens AG
2020 All rights reserved
2.6 Motor data required for commissioning
For correct automatic setting of motor model and control loop parameters some important data
must be entered into the inverter during commissioning. They can usually be found either on the
motor nameplate or in the datasheet provided by the motor supplier:
Table 2-1
Maximum motor current/ current limit
Motor temperature sensor type
1
Other motor parameters that are recommended and preferred to know for commissioning:
Table 2-2
Ratio between the total and motor
moment of inertia
2
Motor stator resistance cold
Cable resistance (if length exceeds 5m)
Motor stator inductance q axis
3
Motor stator inductance d axis
2.7 Sizing of G120X with a PMSM motor
Always check the motor rated current and preferably use an inverter with at least 5% greater
rated current after considering all derating factors like altitude, ambient temperature, sine-wave
filter, number of starts per hour, overload requirements, increased pulse frequency requirements
etc.
This is important because there are usually some production tolerances in the properties of
permanent magnets and they also tend to decrease slightly in strength during the service life of
the motor.
It is strongly recommended to use temperature sensor for motor thermal protection particularly when using
a non-standardized motor.
(J
Load
+ J
Motor
) / J
Motor
With some motors the inductance becomes significantly smaller at higher currents (saturation effect) than
given in the name plate, hence the current controller has to be adapted. IOP-2 displayed name may be Motor
stator leakage inductance.
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