
METALJET D2+
INSTALLATION
Revision 19, November 2016
Page 4-25
4.4
Safety system
The MetalJet D2+ is not equipped with a built-in safety system but provides the signals necessary to implement
one. All safety related signals are dual and separated so an external safety system can be built in a fail safe
manner. It is based on two safety relays that controls the mains supply to the high voltage generator which can
only be activated by an external signal. The MetalJet D2+ source has the possibility to inhibit the circuitry
controlling the relays but not the ability to activate them. This means that in order to generate x-rays, a safety
system needs to be implemented by the customer.
This customer supplied safety system interface with the MetalJet D2+ source through the high voltage
controller and the electron gun. Section 4.4.1 and 4.4.2 below explain the purpose and functionality coupled to
the various connectors.
Excillum document “P
-029-0002 - C
ustomer safety system example
”
is appended to this operating manual. It
shows a system level diagram of how a customer safety system can be implemented.
4.4.1
High voltage controller
The high voltage controller has a male 44-pin high density D-sub connector
labeled
X1
. It gives access to the
safety relays and high voltage monitor outputs. The safety relays should only be activated when the customer
safety requirements are fulfilled. It is the responsibility of the customer to decide what safety level is required.
In addition to controlling the mains supply to the high voltage generator it also provides the customer with
safety relay status feedback and the possibility to route other signals through the safety relays. Furthermore, it
provides analog monitor signals of the high voltage. High voltage monitor outputs range from 0.6 V to 3.93 V
for 0 kV to V
max
kV, where V
max
is max rating for the high-voltage generator. Values outside these indicate
malfunction.
Excillum document “P
-029-0000 - High voltage controller safety system interface
”
is appended to this operating
manual. It shows a detailed schematics of the X1 connector pin-outs.
4.4.2
Electron gun
The safety system related connectors of the electron gun are located in the back of the electron gun, see Figure
4-28.
Figure 4-28.
X-ray head from behind (right side) showing the connectors for the safety system interface.