Siemens SINUMERIK 840D sl Function Manual page 100

Basics regarding the safety functions integrated in the system/drive
6.6 Switching the system on/off
Changes or replacement of hardware and/or software components
After hardware and/or software components have been changed or replaced, it is only
permissible to run up the system and activate the drives when the protective devices are
closed. It is not permissible that personnel are present within the danger zone.
Depending on the change made - or what has been replaced - it may be necessary to carry-
out a partial or complete acceptance test (see Chapter "Acceptance test (Page 543)").
Before personnel may re-enter the hazardous area, the drives should be tested to ensure
that they exhibit stable control behavior by briefly moving them in both the plus and minus
directions (+/–).
This is especially important specifically for high-speed linear or torque motors.
What has to be observed when switching on?
The safety-related functions are only available and can only be activated after the system has
completely run up.
We recommend that the Safe Operating Stop (SBH) function is selected.
For axes with SE/SN, the stop position is used to internally check the position when switching
on.
System runup
System runup is a critical operating state with increased risk. In this phase, especially when
activating drives, it is not permissible that personnel are close to the hazardous area.
Further, for vertical axes, it is very important to ensure that the drives are in a state with the
pulses cancelled.
A complete forced checking procedure is necessary after switching on (refer to Chapter
"Forced checking procedure (Page 82)").
What has to be observed when switching off?
● When SE/SN is activated, the following applies:
The stop position is cyclically saved.
For this reason, the user should only switch-off the control when the axes/spindles with
safety functions have stopped moving.
Note
If the axis is moved with the system switched off, then the saved stop position no longer
matches the current position. For axes with safety-related functions SE and SN, when
switching-on, a user agreement is again required after the position has been checked.
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WARNING
WARNING
Function Manual, 12/2017, 6FC5397-4BP40-6BA1
Safety Integrated