Siemens SINAMICS SM150, Operating And Installation Instructions

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Software description "Safe Torque Off" (macro interconnection)
The software controller receives "Safe Torque Off" option signals from the hardware controller
for operations management.
The "Decelerate to n=0 and pulse suppression" command (active low) induces an immediate
withdrawal of the speed setpoint enable and delays (PDF 0, parameter name p20169, factory
setting T = 8 s) a withdrawal of the operation enable (pulse suppression). The delay PDF 0
must be coordinated with the off-delay time of the time relay K120 (PDF 0, T = T
delay -
K120
- 2 seconds).
The software in the Control Unit must disable the pulses before the power supply for the pulses
on the PSA is removed by the hardware controller otherwise the alarm message "F30100 valve
status drive system A" will be generated.
Once the "Decelerate to n=0 and pulse suppression" command has been withdrawn and a
delay time has elapsed (PDE 0, parameter name p20159, factory setting T = 12 s), operation
can be resumed with the "Acknowledge Safe Torque Off" or "Acknowledge" command.
The delay time PDE 0 must be coordinated with the delay time for time relay -K120 (PDE 0,
T = T
delay -K120
+ 2 seconds), because the power supply for the pulses must be connected on
the PSA before delay time PDE 0 has elapsed.
Note
Before delay time PDE 0 elapses, operation of the "Acknowledge Safe Torque Off" or
"Acknowledge" button will have no effect.
To prevent faults, the "Acknowledge Safe Torque Off" or "Acknowledge" button must be
operated at least for the set time PDE 1 (factory setting T = 500 ms).
If the circuit breaker trips due to a fault in the control of option "Safe Torque Off" (2nd switch-
off signal path), this will be indicated by the fault message "F49055 Circuit breaker opened
due to STO".
Selecting option "Safe Torque Off" in the STARTER commissioning program or running the
optional macro PM001590 will interconnect the 3 binary inputs to terminals on the D445/
D455-2. The acknowledgment command is also interconnected to control word STW3 bit 14.
Both acknowledge inputs are equivalent in order to facilitate an enable via either the
"Acknowledge Safe Torque Off" button or via the fieldbus ("Acknowledge" button).
Description
3.6 Description of options
SINAMICS SM150 6SL3845-7NN46-7AA0
62
Operating Instructions 04/2017