Calculating Switching Cycles - Siemens SIMATIC ET 200SP Manual

Product overview
3.7 Functions
3.7.6

Calculating switching cycles

The switching cycles attainable by the ET200 SP motor starter are determined by the root-
mean-square of the motor current l
the following criterion is met:
I
rms_motor
I
rms_motor
startup time and the motor operation time taking the motor OFF time into account. In the
following formula, I
x = starting current factor I
48
<= I * 1.05
e
is determined on the basis of the root-mean-squares of the motor currents during the
corresponds to the rated current of the connected motor.
e
Startup
. The switching cycle considered is admissible if
rms_motor
/I
e
Manual, 12/2016, A5E34821005002A/RS-AB/002
Motor starter (3RK1308-0**00-0CP0)