Safety Faults - Siemens SINAMICS S120 Function Manual

Safety Integrated Basic Functions

4.4 Safety faults

4.4 Safety faults
The fault messages for Safety Integrated Basic Functions are stored in the standard
message buffer and can be read from there. In contrast, the fault messages for Safety
Integrated Extended Functions are stored in a separate Safety message buffer (see chapter
"Message buffer").
When faults associated with Safety Integrated Basic Functions occur, the following stop
responses can be initiated:
Table 4- 1
Stop response
STOP A cannot be
acknowledged
STOP A
STOP F
With a vertical axis or pulling load, there is a risk of uncontrolled axis movements when
STOP A/F is triggered. This can be prevented by using "Safe Brake Control (SBC)" and a
holding brake (not a safety brake!) with sufficient holding force.
62
Stop responses for Safety Integrated Basic Functions
Triggered ...
For all non-
acknowledgeable
Safety faults with
pulse suppression.
For all
acknowledgeable
Safety faults
As a follow-up
reaction of STOP F.
STOP A is identical to stop Category 0 to EN 60204-1:2006.
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
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.
Function Manual, (FHS), 11/2009, 6SL3097-4AR00-0BP0
Effect
The motor coasts to a
standstill or is braked by the
holding brake.
Follow-up response STOP A
with adjustable
delay (default setting without
delay) if one of the Safety
functions is selected
Safety Integrated