Details And Parameterization - Siemens SINUMERIK MC Commissioning Manual

Note
SS2 with external stop (SS2E)
If you use SS2E, neither of the two monitoring functions (SBR, SAM) is active. The drive is
decelerated by interpolation (SIC/SCC is required for this). SOS becomes active after the delay
time expires.
4.6.1

Details and parameterization

Note
SS2 only with encoder
The "Safe Stop 2" (SS2) safety function can only be used with an encoder.
The "Safe Stop 2" (SS2) function is used to brake the motor safely along the OFF3 deceleration
ramp (p1135) with subsequent transition to the SOS state (see "Safe Operating Stop") after the
delay time expires (p9552). The delay time set must allow the drive to brake to a standstill from
every speed of the operating process within this time. The standstill tolerance (p9530) may not
be violated after this time.
After braking, the drives remain in speed control mode with the speed setpoint n = 0. The full
torque is available.
When braking, one of the following functions is active:
● For p9506 = 0, the following applies:
Braking is monitored with the "Safe Acceleration Monitor" function (see Chapter "SAM
(Page 128)").
● For p9506 = 2, the following applies:
Braking is monitored using the "Safe Brake Ramp" function (see Chapter SBR (Page 130)).
The selection and monitoring of the acceleration (SAM) are realized through two channels –
however, braking along the OFF3 ramp, only through one channel.
● Effect on "Setpoint speed limit effective" (r9733[0...2]):
If SS2 (≙ STOP C), a setpoint of 0 is specified in r9733[0...2].
Safety Integrated (with SINAMICS S120)
Commissioning Manual, 02/2020, A5E46305916B AB
Safety functions integrated in the drive
4.6 SS2
117