Siemens SINAMICS S120 Function Manual page 158

Description of Safety Integrated functions
4.2 Safety Integrated Extended Functions
Single-encoder system
In a single-encoder system, only the motor encoder is used to safely acquire the drive actual
values. This motor encoder must be appropriately suitable (see encoder types). The actual
values are generated in a safety-relevant fashion either directly in the encoder or in the
Sensor Module and are transferred to the Control Unit via DRIVE-CLiQ.
For motors without a DRIVE-CLiQ interface, the connection is made using additional Sensor
Modules.
Even if the drive is operating in the closed-loop torque controlled mode, motion monitoring
functions may be selected as long as it is guaranteed that the encoder signals can be
evaluated.
Note
No monitoring of the braking ramp with SAM or SBR in the case of encoder error in the 1-
encoder system
With p9516.4 = 1 ("No STOP A after encoder error with 1-encoder safety"), set the following
behavior:
• After an encoder error in the 1-encoder system, the drive triggers a STOP F, but not an
immediate STOP A.
• If safety functions are selected, the STOP F is followed in this case by a time-controlled
subsequent stop STOP B
You can use this behavior if, after an encoder error, coasting down would be harmful and
you want instead to use the switchover to encoderless operation with encoderless braking.
If you have selected one of the Basic Functions contained in the Extended Function, the
1)
subsequent stop is STOP A.
156
; i.e. a stop response without monitoring with SBR or SAM.
1)
Function Manual, 12/2018, 6SL3097-5AR00-0BP1
Safety Integrated