Siemens SINAMICS S120 Function Manual page 680

Safety Integrated Basic Functions
11.10 Commissioning the functions "STO", "SBC" and "SS1"
When faults associated with Safety Integrated Basic Functions occur, the following stop
responses can be initiated:
Table 11-9
Stop re‐
sponse
STOP A can‐
not be ac‐
knowledged
STOP A
STOP F
Danger to life due to an uncontrolled movement of the axis
With a vertical axis or pulling load, there is a risk of uncontrolled axis movements when STOP
A/F is triggered. This can cause serious injury or death to persons in the danger zone.
● If there is a hazard due to undesirable or unwanted motion in your application, take
678
Stop responses for Safety Integrated Basic Functions
Triggered ...
For all Safety faults with
pulse suppression that
cannot be acknowledged.
For all acknowledgeable
Safety faults
As a follow-up reaction of
STOP F
STOP A corresponds to Stop Category 0 in accordance with EN 60204-1.
With STOP A, the motor is switched directly to zero torque via the "Safe Torque Off
(STO)" function.
A motor at standstill cannot be started again accidentally.
A moving motor coasts to standstill. This can be prevented by using external braking
mechanisms, e.g. holding or operating brake.
When STOP A is present, "Safe Torque Off" (STO) is active.
If an error occurs in the
data cross-check.
STOP F is permanently assigned to the data cross-check (DCC). In this way, errors are
detected in the monitoring channels.
After STOP F, STOP A is triggered.
When STOP A is present, "Safe Torque Off" (STO) is active.
WARNING
measures to counter it, for example, by using a brake with safe monitoring. For further
information, see Chapter "Safe Brake Control (SBC) (Page 651)."
Action
Trigger safe pulse sup‐
pression via the switch-off
signal path for the relevant
monitoring channel. Dur‐
ing operation with SBC:
Apply motor holding brake.
Transition to STOP A.
Function Manual, 06/2019, 6SL3097-5AB00-0BP2
Effect
The motor coasts to a stand‐
still or is braked by the holding
brake.
Follow-up response STOP A
with adjustable delay (factory
setting without delay) if one of
the safety functions is selec‐
ted
Drive functions