Siemens 3RK1308-0 00-0CP0 Series, Руководство по эксплуатации оборудования

Страница: 83 / 218

Functions
6.6 Calculating switching cycles
Motor starter (3RK1308‑0**00‑0CP0)
Equipment Manual, 11/2019, A5E34821005002A/RS-AC/003
83
6.6 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
rms_motor
. The switching cycle considered is admissible
if the following criterion is met:
I
rms_motor
≤ I
e
* 1.05
I
rms_motor
is determined on the basis of the root-mean-squares of the motor currents during the
startup time and the motor operation time taking the motor OFF time into account. In the
following formula, I
e
corresponds to the rated current of the connected motor.
x = starting current factor I
Startup
/I
e
Table 6- 3 Switching frequency per hour of the 3RK1308 motor starter for the switch-on duration of 0.5 s:
Current setting [A] 0.4 1 3 9 10 12
x = starting current
factor I
Startup
/I
e
Startup
time [s]
Number of starting operations per h
2.5 0.1 4131 4131 4131 4131 4131 4131
2.5 0.3 1377 1377 1377 1377 1377 1377
2.5 0.5 826 826 826 826 826 826
2.5 0.7 590 590 590 590 590 590
2.5 2 207 207 207 207 207 207
4 0.1 1446 1446 1446 1446 1446 1446
4 0.3 482 482 482 482 482 482
4 0.5 289 289 289 289 289 289
4 0.7 207 207 207 207 207 207
4 2 72 72 72 72 72 72
6 0.1 620 620 620 620 620 620
6 0.3 207 207 207 207 207 207
6 0.5 124 124 124 124 124 123
6 0.7 89 89 89 89 89 86
6 2 31 31 31 31 31 25
8 0.1 344 344 344 339 292 75
8 0.3 115 115 115 108 93 20
8 0.5 69 69 69 62 53 8
8 0.7 49 49 49 43 36 0
8 2 17 17 17 9 6 0
10 0.1 219 219 219 51 54 0
10 0.3 73 73 73 12 13 0
10 0.5 44 44 44 0 0 0
10 0.7 31 31 31 0 0 0
10 2 11 11 11 0 0 0