Siemens Sinamics S120 Function Manual page 143

● Recommendation
The SAM tolerance value entered should be approx. 20% higher than the calculated
value.
● You set the tolerance such that the "overshoot" is tolerated that necessarily occurs when
standstill is reached after braking along the OFF3 ramp. However, it cannot be calculated
as to just how high this is.
Not e
First monitoring cycle
For SAM, in the first "SI Motion monitoring cycle" (p9500) a higher SAM tolerance is taken
into account in order to compensate for possible settling operations without resulting in an
incorrect initiation. The increase factor is calculated as follows:
SI Motion monitoring cycle (p9500) / SI Motion actual value acquisition cycle (p9511)
Example:
SI Motion monitoring cycle (p9500) = 12 ms
SI Motion actual value acquisition cycle (p9511) = 1 ms
SAM tolerance (p9548) = 300 rpm
Actual speed = 250
Rotary axis
In the first cycle after activation of the monitoring, the SAM limit value is therefore:
Actual speed + SAM tolerance × (12 ms/1 ms) =
250 rpm + 300 rpm × 12 =
approx. 3850 rpm
Responses
● S peed limit violated (SAM):
– STOP A
– Safety message C01706
● S y stem fault:
– STOP F with subsequent STOP A
– Safety message C01711
Ov erview of important parameters (see SINAMICS S120/S150 List Manual)
• p9546
• p9548
• p9568
Safety Integrated
Function Manual, (FHS), 07/2016, 6SL3097-4AR00-0BP6
SI Motion SSM (SGA n < nx) speed limit (CU)
SI Motion SAM actual speed tolerance (Control Unit)
SI Motion SAM speed limit (Control Unit)
Description of Safety Integrated functions
4.2 Safety Integrated Extended Functions
143