Raytheon 138-119, Operator'S And Service Manual

Page: 29 / 55

COMPASS
STD22
Change Over Box
138--119
23
3769DOC000002
Edition: April 06, 2005
Below mentioned tests have to be carried out:
No. Action Nominal state
1 Switch the Change Over Switch from
“Automatic” to “Sys1”.
No LED lights up at the relays of the
Change Over Box.
All outputs of the DU1 are switched to
the outputs of the Change Over Box.
2 Switch the Change Over Switch from
position “Sys1” to position “Sys2”.
All LED LEDs light up at the relays of
the Change Over Box.
All outputs of the DU2 are switched to
the outputs of the Change Over Box.
3 Switch the Change Over Switch from
“Sys2” to “Automatic”.
No LED lights up at the relays of the
Change Over Box.
All outputs of the DU1 are switched to
the outputs of the Change Over Box.
If errors should occur during the function test, appropriate measures have to be seized for
repair.
3.5 Switching OFF the Change Over Box
The Change Over Box has no ON/OFF switch.
The Change Over Box is shut down by switching OFF both 24 V DC power supplies.
A single Change Over Box can be switched OFF by disconnection of one fuse E1 or E2.