Monitoring Of The Individual Components Of The Safety Circuits - Bruker S8 TIGER Manual De Instrucciones

Introductory User Manual S8 TIGER X-ray Spectrometer

Monitoring of the Individual Components of the Safety Circuits

All components of the S8 TIGER's X-ray safety system are monitored by a microcontroller. This sec-
tion describes the checks performed by the microcontroller.
Monitoring of the relays
All relays used in the S8 TIGER's safety system are special safety relays with a feature called "forcibly
guided contacts". The microcontroller monitors and verifies the status of these relays by reading back
the switching state of their contacts.
Start-up checks
After turning on the instrument, several checks verify that the microcontroller is operating correctly.
Also, the status of the safety system's components is read back and verified.
The functionality of the sample seal position switches is checked by opening and then closing the
sample seal after powering up the instrument.
If none of the startup tests detects an error, the microcontroller will enter normal operation mode (see
the section "Checks during normal operation mode"). If there are any errors, the microcontroller will
block the X-ray generator and enter error operation mode (see the section "Error operation mode").
If the error memory indicates any safety errors that have not yet been confirmed and reset, the micro-
controller will block the X-ray generation and enter error operation mode (see the section "Error opera-
tion mode").
Checks during normal operation mode
The status of every safety system component is monitored continuously. As long as all components
pass their plausibility checks, the microcontroller will activate the two safety relays K1 and K2, ena-
bling the generation of high voltage.
Error operation mode
If the microcontroller detects any error within the X-ray safety system, both relays K1 and K2 will be
disabled immediately. Consequently, the two contactors K52 and K53 will be turned off and the high-
voltage generator will be shut down instantly.
The error condition is saved in non-volatile memory to make sure that the system stays blocked even
after powering the instrument off and then on again.
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