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- the active director,
- all the circuitry in DEU A which is necessary
for PA operation,
- all the circuitry in DEU B which is necessary
for PA and interphone.
In normal operation, the service busbar supplies:
- the active and the second directors,
- the remaining non essential circuitry of the
DEUs,
- the programming and test panel,
- the forward attendant panel.
The service busbar also supplies, the area call panels,
the attendant indication panels and the aft attendant
panel, via DEU B.
ABNORMAL POWER SUPPLY
If service bus power is unavailable, the following
items of equipment are inoperative:
- the second director,
- the non essential D.E.U. circuits,
- the P.T.P. and the F.A.P..
The AIPs and the ACPs are also inoperative because
they are supplied with service bus power by the type
B DEUs.
If a P.A. operation is done, the top line cut-off relay
106RH is no longer energized, and then the essential
busbar supplies the circuitry in type A D.E.U. which
is necessary for P.A. operation.
When the essential bus power is unavailable, circuitry
in the directors and D.E.U.s switches the essential
circuits to the service busbar. This ensures full
C.I.D.S. capabilities exept for emergency mode
operation.
If the aircraft loses main power (the service bus and
the essential bus), and the emergency exit lights
switch is set to ARM or ON, all C.I.D.S. units, which
are supplied by essential bus, are switched
automatically to the hot battery bus.
TMUCI2E03-T02 LEVEL 1
EFFECTIVITY 23-73-00 Page 6
May 31/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 23 COMMUNICATIONS
UF94200
EFFECTIVITY Page 212
ALL
CIDS - DIRECTOR DESCRIPTION/OPERATION
BITE
On C.I.D.S. energization or reset, all director
interfaces are disabled and the directors are
initialized (self-test). The self-test is repeated
periodically. It also includes a test of the data bus
lines.
The power connections are arranged such that director
1 is normally fully active and in control of the CIDS.
Director 2 is normally partially active, in a
hot-standby mode.
A failure in the initialization process in director 1
causes a deactivation of the director 1 hardware and
a switchover of control to director 2. If the self-test
of director 1 fails, director 2 takes over.
At the same time, the power transfer relay is
de-energized. This prepares director 2 to be
supplied from the essential bus in abnormal or
emergency mode.
The second contact of the relay prepares the control
from director 2 to the top line cut-off relay for the
emergency mode.
The directors internal normal power sensing circuits
are always checking if power is available on the
service bus. If the power fails, the following occurs:
- As long as director 1 is OK, the power transfer
relay remains energized. Via the closed
contact, director 1 sends a signal to energize
the top line cut-off relay.
With the top line cut-off relay energized the emergency
mode is activated. In emergency mode, the power from
the essential busbar is disconnected from all type A
D.E.Us as long as no P.A. announcements are made.
Type B DEUs are directly supplied from the essential
bus but only for PA and interphone operations.
Activation of the P.A. system sets the director 1
internal NAND-gate to 0, which de-energizes the
top-line cut-off relay.
Power from the essential busbar supplies the two
essential circuits of type A DEUs.
All bite results are stored in the director bite
dedicated memory.
Failure indications may be given by the following:
- the CIDS caution light,
- the ECAM warning page,
- the ECAM status page,
- the PTP display,
- the respective MCDU pages.
The following items of equipment have their own BITE
functions and send their BITE status to the director:
- each DEU,
- the Programming and Test Panel,
- the Forward Attendant Panel,
- the connected equipment such as PES.
The DEUs are able to test the connected equipment.
TMUCI2E03-T02 LEVEL 1
EFFECTIVITY 23-73-00 Page 7
May 31/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 23 COMMUNICATIONS
UF94200
EFFECTIVITY Page 213
ALL
SELF EXAMINATION
In normal operation director 1 is supplied by:
A - The DC essential bus.
B - The service bus.
C - The hot battery bus.
What happens if the DC essential bus fails ?
A - Director 1 is lost.
B - The service bus supplies both directors.
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ATA 23 COMMUNICATIONS(29)
