Safe Stop 1 (Ss1); Safe Stop 1 With Encoder - Siemens Sinamics S120 Function Manual

4.2.5

Safe Stop 1 (SS1)

4.2.5.1

Safe Stop 1 with encoder

For function SS1 of the Extended Safety Functions, braking monitoring is included.
● If p9506 = 0:
Braking is monitored with the "Safe Acceleration Monitor" function (see Chapter "Safe
Acceleration Monitor (SAM) (Page 142)").
In this case, we also talk about "SS1 (time and acceleration controlled)".
● If p9506 = 2:
Here, also for SS1, the monitoring function "Safe Brake Ramp" is active (see Chapter
"Safe Brake Ramp (SBR) (Page 144)").
In this case, we also talk about "SS1 (speed controlled)".
The "Safe Stop 1" (SS1) function allows the drive to be stopped according to EN 60204-1,
Stop Category 1. The drive brakes with the OFF3 ramp (p1135) once "Safe Stop 1" is
selected and switches to "Safe Torque Off" (STO) once the delay time has elapsed (p9556)
or when the shutdown speed is fallen below (p9560).
Functional features of Safe Stop 1 with encoder
● The delay time starts after the function has been selected. If SS1 is deselected within this
time, after the delay time has elapsed or after the velocity has fallen below the shutdown
speed, the STO function is selected and deselected again immediately; i.e. the SS1
function is ended completely normally. It cannot be interrupted.
● Selection and monitoring of the acceleration (SAM) or the monitoring function "Safe
Brake Ramp" are implemented in two channels, but braking along the OFF3 ramp is only
implemented in one channel.
Not e
Int errupting the ramp function with OFF2 by the higher-level controller
Activating SS1 can mean that the higher-level controller (PLC, motion controller), which
specifies the speed setpoint, interrupts the ramp function (e.g. with OFF2). The device
behaves in this way as a result of a fault reaction triggered by OFF3 activation. This fault
reaction must be avoided by assigning appropriate parameters or configurations.
Not e
No OFF2 with S S1 and E POS
If you use SS1 together with EPOS, the fault reaction to F07490 (EPOS: enable withdrawn
while traversing) OFF2 is not permitted. The response to this error message (OFF1, OFF2 or
OFF3) can be configured via p2100/p2101.
Safety Integrated
Function Manual, (FHS), 07/2016, 6SL3097-4AR00-0BP6
Description of Safety Integrated functions
4.2 Safety Integrated Extended Functions
87