To enable the drive to brake to standstill after selection, the time in p9556 must be selected to
be long enough for the drive to be able to brake along the OFF3 ramp (p1135) from any speed
of the underlying process to below the shutdown speed (p9560).
Note
Setting the delay time
So that the drive is able to travel down the OFF3 ramp completely and any motor holding brake
present can be applied, the delay time should be set as follows:
● Motor holding brake parameterized: Delay time ≥ p1135 + p1228 + p1217
● Motor holding brake not parameterized: Delay time ≥ p1135 + p1228
The shutdown speed defined in p9560 must be set in such a way that coasting down (due to the
subsequent STO function) does not represent any risk for man and machine.
Responses
System fault:
1. STOP F with subsequent STOP B, followed by STOP A
2. Safety message C01711
Status of Safe Stop 1
You can check the status in the SI diagnostics screens via "MENU SELECT > Diagnostics >
Menu forward key > Safety".
4.3.1.2 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 (Page 100).
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 "SBR (Page 130)." In this
case, we also talk about "SS1 (speed controlled)".
Safety functions integrated in the drive
4.3 SS1
Safety Integrated (with SINAMICS S120)
Commissioning Manual, 02/2020, A5E46305916B AB 101
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