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Safety Integrated Functions in
SINAMICS Drive Systems
6.2 Safety Integrated functions in SINAMICS S120 drive systems
6.2
Safety Integrated functions in SINAMICS S120 drive systems
The following Safety Integrated functions are available for SINAMICS S120:
● Basic functions
● Extended functions
Basic functions
These functions are part of the standard scope of the drive and can be used without
requiring an additional license:
● Safe Torque Off (STO)
STO is a safety function that prevents the drive from restarting unexpectedly,
in accordance with EN 60204-1:2006 Section 5.4.
● Safe Stop 1 (SS1, time controlled)
Safe Stop 1 is based on the "Safe Torque Off" function. This means that a Category 1
stop in accordance with EN 60204-1:2006 can be implemented.
● Safe Brake Control (SBC)
The SBC function permits the safe control of a holding brake.
SBC is only supported by power/motor modules of the chassis model with the order
number ...3 or higher. Blocksize power modules also require a safe brake relay for this
function.
Extended functions
The following functions are available in addition to the Basic functions:
● Safe Stop 1 (SS1, time and acceleration controlled)
The function SS1 is based on the "Safe Torque Off" function. This means that a
Category 1 stop in accordance with EN 60204-1:2006 can be implemented. The drive
brakes after "Safe Stop 1" with OFF3 ramp (p1135) was selected and then goes into the
"Safe Torque Off" (STO) state on expiration of the delay time (p9356/p9556) or when
reaching the shutdown speed (p9360/p9560).
● Safe Stop 2 (SS2)
The SS2 function brakes the motor safely with a subsequent transition to
"Safe Operating Stop" (SOS).
● Safe Operating Stop (SOS)
The SOS function protects against unintentional motion. The drive is in closed-loop
control mode and is not disconnected from the power supply.
● Safely-Limited Speed (SLS)
The "Safely-Limited Speed" (SLS) protects against excessively high drive speeds.
● Safe Speed Monitor (SSM)
The SSM function safely monitors the speed limit and issues a safe output signal,
but without initiating a response function.
Connection of the SINAMICS S120 to the Technology CPU
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Product Information, 09/2011, A5E00480378-04