Safety Faults - Siemens SINAMICS S120 Function Manual

Description of Safety Integrated functions
4.1 Safety Integrated basic functions
4.1.4

Safety faults

The fault messages of the Safety Integrated Basic Functions are saved in the standard
message buffer and can be read out from there. By contrast, the fault messages of the
Safety Integrated Extended Functions are stored in a separate Safety message buffer (see
Chapter "Message buffer (Page 382)").
When faults associated with Safety Integrated Basic Functions occur, the following stop
responses can be initiated:
Table 4- 1 Stop responses for Safety Integrated Basic Functions
Stop response Triggered ...
STOP A cannot For all Safety faults with pulse
be acknowl- suppression that cannot be
edged acknowledged.
STOP A 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.
STOP F 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.
Uncontrolled movement of the axis.
With a vertical axis or a pulling load, there is a danger of uncontrolled movement of the axis
when STOP A/F if triggered.
This can cause serious injury or death to persons in the danger zone.
• If there is a hazard due to unwanted movement in your application, take measures to
86
WARNING
counter it, for example, by using a brake with safe monitoring. For additional information,
see Chapter "Safe Brake Control (SBC) (Page 78)".
Action
Trigger safe pulse suppression
via the switch-off signal path for
the relevant monitoring channel.
During operation with SBC:
Apply motor holding brake.
Transition to STOP A.
Effect
The motor coasts to a standstill or is
braked by the holding brake.
Follow-up response STOP A
with adjustable delay (factory set-
ting without delay) if one of the
safety functions is selected
Function Manual, 12/2018, 6SL3097-5AR00-0BP1
Safety Integrated