R **ON A/C 001-003, 051-099, 401-499,
ECB APU Parameter List Remarks: *1 set to 1 if it has failed *2 set 1 if condition caused the last shutdown R = Resolution W = Wordrange
(1) = Significant Data Digits
D. Alpha Call-Up List
-------------------------------------------------------------------------------
ALPHA PARAMETER NAME UNIT
CALL-UP NUMBER
-------------------------------------------------------------------------------
APFD 7A.1.004.01 Performance Adjustment (APU)
ADWI 7A.1.037.01 Discrete Status Word #1 (APU)
ASN 7A.1.050.01 APU Serial Number
LCDT 7A.1.074.01 Bleed Air Temp DEG. C
LCIT 7A.1.110.01 Load Compressor Inlet DEG. C
P2A 7A.1.112.01 Inlet Pressure bar
WB 7A.1.123.01 Bleed Air Flow Kg/sec
IGV 7A.1.130.01 IGV Position Degrees
AHRS 7A.1.132.01 Operating Hours (APU) hrs
ACYC 7A.1.133.01 Start Cycles (APU)
PT 7A.1.166.01 Bleed Air Pressure bar
EGTA 7A.1.175.01 EGT (APU) DEG. C
NA 7A.1.176.01 RPM APU % rpm
OTA 7A.1.247.01 APU Oil Sump Temp. DEG. C
AMW1 7A.1.353.01 Maintenance Word *1 (APU)
AMW2 7A.1.351.01 Maintenance Word *2 (APU)
AMW3 7A.1.352.01 Maintenance Word *3 (APU)
6. Component Description_____________________
**ON A/C 001-003, 051-062,
A. Electronic Control Box (ECB) 59KD
(1)
The ECB 59KD is a microprocessor-based digital control-system. The Intel 8086 Central Processing Unit (CPU) processes the program data kept in an Erasable Programmable Read Only Memory (EPROM). The program gives the control and internal tests of the system. A Random Access Memory (RAM) keeps:
-
the results of temporary calculations (such as fuel schedules and speed rate commands) that change continuously,
-
the operational and test status flags,
-
the software computational temporary data.
A 8031 processor gives the Built-In Test Equipment (BITE) functions.
It transmits the data through the ARINC 429 Bus of the ECB and the
RS232 interface.
(2)
The ECB 59KD is a fully digital electronic controller that does the primary part of the APU system logic. The ECB will do this for all modes of engine operation. These include self-tests, protective shutdowns and continuous monitoring of these APU functions:
(a)
Start Sequence,
(b)
Start,
(c)
Speed (rpm),
(d)
Operation Temperature - EGT,
(e)
Shutdown Sequence,
(f)
Automatic Shutdown,
(g)
Bleed Air.
R **ON A/C 063-099, 401-499,
A. Electronic Control Box (ECB) The ECB 59KD is a microprocessor-based digital control-system. The Central Processing Unit (CPU) processes the program data, kept in a memory. The program gives the control and internal tests of the system. A Random Access Memory (RAM) keeps the:
-Results of temporary calculations (such as fuel schedules and speed rate commands) that change continuously,
-Operational and test status flags,
-Software computational temporary data.
The CPU gives the Built-In Test Equipment (BITE) functions. It transmits
the data through the ARINC 429 Bus of the ECB and the RS232 interface.
The ECB hardware consists of an ARINC 600 5-modular concept unit (5MCU) housing. The housing includes the four Printed Circuit Boards (PCB) that follows:
-Central Processing Unit (CPU) PCB;
-Power Supply PCB;
-Input/Output (analog and digital) PCB
-I/O connect module PCB.
All A/C-side electrical connections are performed through a single ARINC
600 size 2 connector. The ARINC connector is located on the rear panel.
An additional RS232 connector on the front side of the ECB is used only
with a PC-based system. There is no connection via this RS232 connector
to the A/C installation.
(1)
Central Processing Unit PCB The major components of the CPU PCB are as follows:
-Single Motorola MC68332 32-Bit microcontroller,
-1024KB x 8 flash EEPROM,
-256 KB SRAM
-16 KB x 8 EEPROM (storage of LRU Faults and Shutdowns and APU data),
-Watchdog circuit,
-Overspeed protection circuitry.
(2)
Power Supply PCB The major components of the Power Supply PCB are as follows:
-Power supply circuity,
-LEMP protection for all input/output wires,
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