Siemens SINAMICS S110 - Page 514

Safety Integrated Functions
8.9 Acceptance test and acceptance report
Function Manual
512 Function Manual, 01/2011, 6SL3097-4AB10-0BP3
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Figure 8-48 Example Trace SS1 without encoder
Trace evaluation:
● SS1 function is selected (time axis 0 ms; see bit "deselection SS1")
● Response bit "SS1 active" is set (time axis approx 20 ms)
● The drive decelerates along the configured OFF3 ramp (p1135)
● Recording r9714[0] indicates whether the OFF3 ramp is active
● STO is activated (time axis approx. 720 ms; see bit "STO active"); at this point the speed
falls below the shutdown speed SS1 (p9560/p9360)
● A fault is generated if the envelope curve of function SAM (Drive_1.r9714[1]) is exceeded
by the actual speed (r9714[0])
In contrast to the SAM for Safety with encoder, this curve is not tracked according to
actual speed but calculated using Safety parameters. Furthermore, this monitoring only
becomes active after a configurable time has elapsed (in this case the time is 250 ms).
Note
Small time differences (of the order of 2 to 3 Safety clock cycles (here up to 36 ms)) are
caused by internal calculations and do not present a problem.