Motor Data Required For Commissioning; Sizing Of G120X With A Pmsm Motor - Siemens SINAMICS G120X Commissioning Manual

2 General conditions of operation
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
Parameter name
Rated motor current
Rated motor power
Rated motor speed
Maximum motor speed
Minimum speed
Rated motor voltage
Rated motor frequency
Maximum motor current/ current limit
Motor temperature sensor type
Other motor parameters that are recommended and preferred to know for commissioning:
Table 2-2
Parameter name
Motor moment of inertia
Ratio between the total and motor
moment of inertia
Motor stator resistance cold
Cable resistance (if length exceeds 5m)
Motor stator inductance q axis
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.
1
It is strongly recommended to use temperature sensor for motor thermal protection particularly when using
a non-standardized motor.
2
(J + J ) / J
Load Motor Motor
3 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.
G120X commissioning guide for permanent magnet motors PMSM
Entry-ID: 109780815, V1.0,
1
2
3
07/2020
Parameter number
p305
p307
p311
p322
p1080
p304
p310
p640
p601
Parameter number
p341
p342
p350
p352
p356
p357
Unit
Arms
kW
rpm
rpm
rpm
V
Hz
Arms
-
Unit
kg.m2
-
Ohm
Ohm
mH
mH
7