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6. Component Description
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A. Cabin Pressure Controller (CPC)
(Ref. Fig. 011)
The CPCs 11HL (12HL) have functions as follows:
-automatic cabin pressure control,
-back-up indication for manual control,
-alarm functions (ECAM warnings),
-self-monitoring and failure indication (BITE + CFDS).
Two identical CPC are used for redundant system control, each contains:
-a cabin pressure sensor,
-
the ARINC bus interface to SDAC (ECAM), CFDS, FMGS and ADIRS,
-
the discrete interface to the LGCIU and EIU,
-
the digital control logic,
-
the interface with the landing-field elevation selector,
-
the interface with the other CPC,
-
the interface with the outflow valve 10HL actuator.
A separate electrically supplied part of the CPC in Position 1 is the
back-up circuit and it contains:
-a pressure sensor,
-an analog circuit.
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CPC - Block Diagram Figure 011
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These generate the limit function output discrete and the analog system display outputs. The controllers are housed in a standard 2 MCU (Ref. ARINC 600), and are installed in the shelves 95VU and 96VU of the main rack 90VU. The CPC receives signals from different sources. All signals sent are digital or discrete. The CPC back-up indication circuit sends only analog signals to the EIS.
**ON A/C 001-049, 051-061, 101-105, 201-203,
(1) Cabin Pressure Sensor (Ref. Fig. 012) The cabin pressure sensor within the CPC 11HL (12HL) is of a vibrating cylinder type. The principle is that a physical body vibrates at its natural frequency with high stability under constant environmental conditions. The frequency of oscillation of this system is a function of materials and shape of the cylinder. The frequency depends on the environment, specifically temperature and pressure surrounding the cylinder. Therefore, the frequency can be used as a reference value of the pressure.
R **ON A/C 062-099, 106-149, 151-199, 204-299, 301-399, 401-499,
(1) Cabin Pressure Sensor The cabin pressure sensor within the CPC 11HL (12HL) bases on a piezo resistive sensing element (Wheatstone bridge). In order to allow temperature compensation the pressure is calculated with the signal of a temperature sensor.
R **ON A/C 106-149, 303-399, 401-499,
R R R R R R R (2) Residual Pressure Control Unit (RPCU) The RPCU is an electronic box with 2 connectors for the electrical interface connection. The RPCU is not attached to a rack and has no local controls or indicators. The RPCU is permanently connected to the 28VDC essential bus 301PP and has a discrete 28VDC output for the power supply of the manual motor of the outflow valve.
CPC Pressure Sensor Figure 012
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**ON A/C ALL
B. Outflow Valve
NOTE : This description is only applicable for Outflow Valve Part Numbers
____
9023-15703-81 and previous.
(Ref. Fig. 013, 014)
The outflow valve 10HL is of a motor driven type. The valve body assembly
is cast from aluminum alloy. The outflow valve has:
-
two outflow valve electronic boxes,
-
two automatic motors,
-
a manual motor,
-
a feedback module,
-an outflow valve body and,
-a gearbox.
Only one motor is active at any one time. During this time the other
motors are locked.
(1)
Outflow Valve Electronic Boxes The outflow-valve electronic boxes contain the electronic circuits which are devided into the following sections:
-
the data input section (RS422 receiver),
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