Functions
6.6 Calculating switching cycles
Motor
starter (3RK1308‑0**00‑0CP0)
Equipment Manual, 11/2019, A5E34821005002A/RS-AC/003
87
Example for the minimum idle time (T
Off
) 12 A motor starter at I
Startup/
I
rated
= 8
The graphic below shows the minimum idle time of a 12 A motor starter with the following
parameters:
I
rated_motor
= 10.4 A
I
startup/Irated_motor
= 8.6; thus: I
Startup
≈ 89
A
T
Startup
= 0.125 s T
Off
≥ 19
s