Siemens SINUMERIK 840D sl Function Manual page 47

As a result of the fault analysis, the machine manufacturer is in a position to define the residual
risk at his machine regarding Safety Integrated. The following residual risks are known.
Additional residual risks
● Safety Integrated is only activated if all of the system components are powered-up and
● Faults in the absolute track (C-D track), cyclically interchanged phases of motor
● When incremental encoders are used, the functions "Safe software limit switches" (SE)
● When no user agreement has been given (see Chapter "User agreement (Page 92)", "User
● The simultaneous failure of two power transistors (one in the upper and the other offset
Safety Integrated
Function Manual, 12/2017, 6FC5397-4BP40-6BA1
WARNING
have been booted.
connections (V-W-U instead of U-V-W) and a reversal in the control direction can cause
an increase in the spindle speed or axis motion. Category 1 and 2 Stop functions according
to EN 60204-1 (defined as Stop B to E in Safety Integrated) that are provided, are however
not effective due to the fault.
Category 0 stop function according to EN 60204-1 (defined as STOP A in Safety
Integrated) is not activated until the transition or delay time set via machine data has
expired. When SBR is active, these errors are detected (STOP B/C) and the Category 0
stop function according to EN 60204-1 (STOP A in Safety Integrated) is activated as early
as possible irrespective of this delay (see Chapter "Safe Acceleration Monitor
(Page 134)"). Electrical faults (defective components etc.) can also result in the response
described above.
and "Safe software cams or cam tracks" (SN) can only be used after referencing has been
successfully completed.
agreement"), the safe software limit switches (SE) are not active; the safe software cams
or cam tracks (SN) are active, but are not safe in the sense of Safety Integrated.
in the lower inverter bridge) in the inverter may cause the axis to move briefly.
The maximum movement can be:
Synchronous rotary motors: Max. movement = 360° / no. of pole pairs
Synchronous linear motors: Max. movement = pole width
Example: Synchronous motor:
For a 6-pole synchronous motor, the axis can move by a maximum of 60 degrees. With
a ballscrew that is directly driven by, e.g. 20 mm per revolution, this corresponds to a
maximum linear motion of approximately 3.33 mm.
Example, synchronous linear motor:
For a synchronous linear motor, the movement can be a maximum of one pole width. This
corresponds to the following distances:
1FN1-07: 27 mm
1FN1-12/-18/-24: 36 mm
1FN3: 20 mm
4.5 Safety information & instructions and residual risks
System features
47