Siemens SINUMERIK 840D sl Function Manual page 98

Basics on the Safety Functions Integrated in the System/Drive
5.6 Switching the system on/off
Warning
!
When the system boots, this represents 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.
We recommend a complete forced checking procedure after powering-up (see
Section 5.3, "Forced checking procedure").
What has to be observed when powering-down?
– The following applies when SE/SN is activated:
The stop position is also cyclically saved.
For this reason, the user should only power-down the control when the axes/
spindles with safety functions have stopped moving.
Note
If the axis is moved with the system powered-down, then the saved stop
position no longer matches the current position. For axes with safety SE and SN
functions, when powering-up, a user agreement is again required after the position
has been checked.
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SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 03.2006 Edition
© Siemens AG, 2006. All rights reserved
03.06