Siemens SIRIUS 3SK1 Manual page 195

Example 2
3 x 3SK1220 + 3SK1122-.AB40 + 3SK1211-.BB40 + 3RM1 Failsafe motor starter
①
②
③
④
Abbreviations in the following formulas:
GG = basic unit; EE = input expansion; AE = output expansion
In the event of shutdown by sensor 1, the total response time is calculated as follows:
● Basic unit = 40 ms
● 3SK1211 output expansion = GG + AE = 40 ms + 10ms = 50 ms
● 3RM1 Failsafe = GG + 3RM1 Failsafe = 40 ms + 3RM1 Failsafe motor starter response
time
In the event of shutdown by sensor 3, the total response time is calculated as follows:
● Basic unit = GG + EE 1 + EE 2 = 3 x 40 ms = 120 ms
● 3SK1211 output expansion = GG + EE 1 + EE 2 + AE 3SK1211 = 120 ms + 10 ms = 130
ms
● 3RM1 Failsafe = 120 ms + 3RM1 Failsafe motor starter response time
In the event of shutdown by sensor 4, the total response time is calculated as follows:
● Basic unit = 3 x response time EE + response time GG = 160 ms
● 3SK1211 output expansion = total response time EE with GG + AE = 170 ms
● 3RM1 Failsafe = 160 ms + 3RM1 Failsafe motor starter response time
SIRIUS 3SK1 safety relays
Manual, 06/2018, A5E02526190021A/RS-AD/004
3SK1220 input expansions
3SK1122 basic unit
3SK1211 output expansion
3RM1 Failsafe motor starters
Configuration / operation
10.4 Response times
195