VPN
98-121
ISSUE
3
PAGE
7
2.2
P
RINCIPLE OF
O
PERATION
The cable carries 3 pairs of color-coded wires.
Each pair must be linked together by the safety system before the AT5600 will operate a high
voltage test.
If any one of the three pairs become un-linked during a test, the AT5600 very quickly switches off
any high voltage that is being produced.
There are three pairs of wires in order to provide the multiple redundancies required by various
international safety standards.
Yellow and Blue
The primary control (MPCE) elements of the AT5600. The primary generator power is passed
through the yellow and blue leads. The contacts used to connect yellow to blue must be rated
230V ac, 4A or more.
Black Link
This link may be used to series two primary control relays of the safety system. This provides
protection against one of the MPCE relays of the safety system locking in a closed position.
Red and White
This is the secondary control element (MSCE) of the AT5600. If this pair is open-circuited, prime
power will also be removed from the AT5600 high power generator. This action is independent of
the MPCE above and thus provides fail-safe operation of the complete safety system.
A 6k8 resistor is fitted in series with this pair, as required by the AT5600
’s electrical control
system.
Green and Black
This is a monitoring pair, used by the AT5600 to confirm the status of the safety system.
