Safe Stop 1 Without Encoder - Siemens Sinamics S120 Function Manual

4.2.5.2

Safe Stop 1 without encoder

Two encoderless Safe Stop 1 (SS1) monitoring functions can be set with parameter p9506:
● p9506 = 3: Safe monitoring of acceleration (SAM) / delay time
The function is identical to "Safe Stop 1" with encoder, which was described in the
previous section.
In this case, we also talk about "SS1 (time and acceleration controlled)".
● p9506 = 1: Safe brake ramp monitoring (SBR)
In this case, there is no SS1 delay time active. The transition from SS1 to STO depends
entirely on the speed falling below the shutdown speed (p9560). You will find more
information on the function "Safe Brake Ramp (SBR)" in Chapter "Safe Brake Ramp
(SBR) (Page 144)." In this case, we also talk about "SS1 (speed controlled)".
Image 4-3 Sequence for "Safe Stop 1" without encoder with SBR monitoring (p9506 = 1)
Functional feature of Safe Stop 1 without encoder
● Selection and monitoring of the brake ramp (SBR) or the acceleration (SAM) are
implemented in two channels, however braking at the OFF3 ramp is only through one
channel.
Safety Integrated
Function Manual, (FHS), 07/2016, 6SL3097-4AR00-0BP6
Description of Safety Integrated functions
4.2 Safety Integrated Extended Functions
89