Sam - Siemens SINUMERIK MC Commissioning Manual

Safety functions integrated in the drive

4.8 SAM

4.8 SAM
The "Safe Acceleration Monitor" (SAM) function is used to safety monitor braking along the
OFF3 ramp. The function is active for SS1, SS2 or STOP B and STOP C.
Features
As long as the speed is less, the converter continuously adds the adjustable tolerance p9548
to the actual speed so that the monitoring tracks the speed. If the speed is temporarily higher,
the monitoring remains at the last value. The converter reduces the monitoring threshold until
the "Shutdown speed" has been reached.
SAM recognizes if the drive accelerates beyond the tolerance defined in p9548 during the ramp-
down phase, and generates a STOP A. The monitoring function is activated for SS1 (or STOP
B) and SS2 (or STOP C) and is deactivated after the speed drops below the value set in p9568.
Note
Relationship between SSM and SAM
If 0 is entered for p9568, the speed limit of the SSM function (p9546) is also used as minimum
limit value for the SAM function (Safe Acceleration Monitoring). If the speed is below this limit,
SAM no longer triggers a response from the drive.
In this case, the effects of Safe Acceleration Monitoring are therefore significantly restricted if
a relatively high SSM velocity limit is set when using the SS1 and SS2 stop functions.
Note
No direct selection of SAM
SAM is part of the Safety Integrated Extended Functions SS1 and SS2 or STOP B and STOP
C. SAM cannot be individually selected.
Calculating the SAM tolerance of the actual speed
● The following applies when parameterizing the SAM tolerance:
– The maximum speed increase after SS1 or SS2 is triggered results from the effective
– The duration of the acceleration phase is equivalent to one monitoring cycle (MC p9500)
● Calculating the SAM tolerance:
Actual speed for SAM = acceleration × acceleration duration
The following setup rule is derived thereof:
– For linear axes:
– For rotary axes:
128
acceleration (a) and the duration of the acceleration phase.
(delay from detecting an SS1 / SS2 until n
SAM tolerance [mm/min] = a [m/s
SAM tolerance [rpm] = a [rev/s
= 0)
set
] x MC [s] x 1000 [mm/m] x 60 [s/min]
2
] x MC [s] x 60 [s/min]
2
Commissioning Manual, 02/2020, A5E46305916B AB
Safety Integrated (with SINAMICS S120)