Emergency Stop Interlock; General Information - Brainlab ExacTrac Planning Manual

Emergency STOP Interlock

8.2 Emergency STOP Interlock
8.2.1

General Information

If a total system shut down ('system power emergency OFF') is desired or required by local
regulations, an external circuit must be installed in addition to the mandatory emergency STOP
circuit at the mains of the ExacTrac computer cabinet (1.0) and generator cabinet (2.0). For more
information, see the following sections.
Emergency STOP either via the External interlock input (building installation) or from linac
interface is mandatory. The emergency OFF circuit via system power only is not sufficient.
Effects of Emergency STOP (EMO Outputs)
The ExacTrac emergency STOP prevents hazards that could occur from risks arising from the
intended operational states. The following table shows the effect that hitting the EMO button has
on ExacTrac:
Intended Operation
Patient movement by
ExacTrac controlled li-
nac couch.
Patient movement by
ExacTrac controlled
Robotics couch top.
X-ray exposure for pa-
tient localization.
NOTE: The ExacTrac computer cabinet and workstations, as well as devices with extra low
voltage remain powered in case of an emergency STOP. The X-ray generators enter stand-by
mode.
Sources that Assert ExacTrac EMO (EMO Inputs)
All operational risks in one room installation should be cut-off by the same emergency Off button
chain. Therefore, ExacTrac 6 does not provide a separate button or a direct user interface for
emergency OFF. Instead, ExacTrac contains an interface to connect to different centralized
emergency OFF circuits.
Check the table on page 81 whether your linac provides the 3rd party motion interface ("Linac"). In
this case no building installation is required. Brainlab Service will connect the ExacTrac system to
the centralized emergency OFF circuits in the treatment room.
Otherwise, provide the interface to the building installation as specified below.
82
Risk Hazard
ExacTrac operator
does not recognize a Patient gets trapped
mechanical collision by moving parts.
during movement.
ExacTrac operator
does not recognize a Patient gets trapped
mechanical collision by moving parts.
during movement.
ExacTrac operator Unwanted X-ray expo-
does not notice there sure to additional peo-
are people in treat- ple in the treatment
ment room. room.
Effect of pressing
the EMO button
ExacTrac stops couch
movement immediate-
ly.
ExacTrac stops couch
movement immediate-
ly.
ExacTrac immediately
inhibits dual generator
exposure.
Site Planning Manual Rev. 1.0 ExacTrac Ver. 6.x