Siemens SIRIUS 3RW55 - 5.2 Motor Parameters

Parameter assignment
5.2 Motor parameters
SIRIUS 3RW55 soft starter
72 Manual, 08/2018, A5E35630887002A/RS-AB/002
5.2
Motor parameters
Setting of the rated operational current I
e
is the minimum requirement for operation. The
motor parameters are located on the rating plate of the three-phase induction motor being
used. You will find a description of all other parameters in Chapter Functions (Page 79).
You can also specify additional parameters under the following menu:
"Parameters > Soft Starter > Motor parameters"
Rated operational current I
e
The rated operational current I
e
is the current that can be continuously conducted by the
feeder (switchgear and motor). Normally this is the rated current I
e
of the motor. The setting
range depends on the rating class of the soft starter.
Note
Motor overload protection
If motor overload protection is to be ensured by the soft starter, you must set the rated
operational current I
e
.
The motor overload protection can be switched off. In this case, motor overload prot
ection
must be ensured by means of a temperature sensor in the motor (thermistor motor protection
with temperature sensor).
Service factor
The service factor determines the maximum permissible overload factor of the motor in the
ramped-up status. At values above 1.05 the motor overload protection trips later.
If a service factor is specified by the manufacturer, select this service factor.
If no service factor is specified, select the service factor 1.0.
Setting range
Factory setting
Increment
1.0 ... 1.15
1.0
0.01
Rated torque
If the motor's rated torque is not indicated on the rating plate, you can calculate it using the
following formula:
Rated torque (Nm) = Power (kW) × (9 550 / rated operating speed (rpm))
Setting range
Factory setting
Increment
0 ... 10 000 Nm
0 Nm
1 Nm