Siemens SINAMICS S120 Function Manual page 324

Safety Integrated basic functions
9.7 Commissioning the "STO", "SBC" and "SS1" functions
Stop response
STOP F
1) If STOP F is output by the crosswise data comparison of the two input signals when the "Safe
torque off" function is selected, this means that the pulses have already been canceled when "Safe
torque off" was selected on one channel.
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 with sufficient retention force (non-safe).
Acknowledging the safety faults
Safety Integrated faults must be acknowledged as follows:
1. Remove the cause of the fault.
2. Deselect "Safe Torque Off (STO)".
3. Acknowledge the fault.
If safety commissioning mode is exited when the safety functions are switched off (p0010 =
value not equal to 95 when p9601 = p9801 = 0), all the safety faults can be acknowledged.
Once safety commissioning mode has been reset (p0010 = 95), all the faults that were
previously present reappear.
NOTICE
The safety faults can also be acknowledged (as with all other faults) by switching the drive
unit off and then on again (POWER ON).
If this action has not eliminated the fault cause, the fault is displayed again immediately
after power up.
324
Action
STOP A is identical to stop Category 0 to 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. armature short-circuiting, holding or operational
brake).
When STOP A is present, "Safe torque off (STO)" is effective.
Transition to STOP A.
STOP F is permanently assigned to the crosswise data comparison (CDC). 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 effective.
WARNING
Effect
None
1)
Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4
Triggered ...
If an error occurs in the
crosswise data
comparison.
Drive Functions