Siemens SINUMERIK MC Commissioning Manual page 123

Differences between "Safe Stop 2 with OFF3" and SS2ESR
● If SS2ESR with external stop is selected, the drive does not brake the motor automatically,
but instead, follows the defined speed setpoint: This can also result in fast retraction motion.
● During the delay time p9554, the brake ramp (SBR) and the acceleration (SAM) are not
monitored, and there is no standstill detection.
● SOS becomes active after the delay time p9554 has expired. If function SS2ESR is active,
the higher-level control system must define the speed setpoint such that the motor is
stopped no later than after the delay time p9554 has expired.
● To enable SS2ESR, set p9501.4 = 1.
● PROFIsafe control word S_STW2.29 selects function SS2ESR. PROFIsafe S_STW2.29 is
contained in telegrams 31, 901, 902 and 903.
● PROFIsafe status word S_ZSW2.27 indicates whether function SS2ESR is active.
PROFIsafe status word S_ZSW2.27 is contained in telegrams 31, 901, 902 and 903. The
associated diagnostics parameter is r9722.27. In the "Safety Info Channel," status word
S_ZSW3B.12 indicates whether the SS2ESR function is active. The associated diagnostics
parameter is r10234.12.
● In addition, in the "Safety Info Channel", status word S_ZSW1B.14 = 1 is set. This bit
corresponds to diagnostic parameter r9734.14.
● You can use p0890[1] to interconnect to an ESR integrated in the drive.
● SS2ESR has no effect on the "Setpoint speed limit effective" (r9733[0...2]). If SS2ESR is
enabled in p9501.4, then a STOP E also has no effect on r9733[0...2].
Deselecting SS2ESR while SS2ESR is active
Figure 4-10
After the function has been selected, the delay time starts to elapse - even if the function is
deselected during this time. In this case, after the delay time has expired, the SOS function is
briefly active. Afterwards, it is permissible that the drive accelerates the motor back to the speed
setpoint.
Safety Integrated (with SINAMICS S120)
Commissioning Manual, 02/2020, A5E46305916B AB
Deselecting SS2ESR while SS2ESR is active
Safety functions integrated in the drive
4.6 SS2
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