Safety Faults - Siemens SINAMICS S120 Function Manual

Safety Integrated basic functions
10.9 Commissioning the "STO", "SBC" and "SS1" functions
10.9.3

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.
When faults associated with Safety Integrated Basic Functions occur, the following stop
responses can be initiated:
Table 10- 6
Stop response
STOP A cannot
be acknowledged
STOP A
STOP F
Risk of uncontrolled axis motion
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.
616
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
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, (FH1), 04/2014, 6SL3097-4AB00-0BP4
Effect
The motor coasts to a
standstill 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 selected
Drive functions