--------------------------------------------------------------------
LOAD OUTPUT SIGNAL SIGNAL STEADY CONDITION
STATE --------------------------------------------------------------------Air Intake Actuator 28 V DC 1.6 A (Ref. 49-16-51 (open CMD) Air Intake Actuator 28 V DC 1.6 A (Ref. 49-16-51 (close CMD) APU System Bus ARINC 429 APU Fuel Low Pressure Relay 28 V DC 200 mA
(3)
ECB 59KD Output Signals to APU loads:
-fuel solenoid,
-fuel-control Torque Motor (TM),
-ignition unit driver,
-surge control valve (TM),
-inlet guide vanes (TM),
-de-oil solenoid,
-load-control valve solenoid,
(4)
APU Input Signals to the ECB 59KD:
-EGT (T5) chromel-alumel thermocouples (redundant),
-monopole transducer (APU speed) (redundant),
- oil-sump temperature sensor,
-high-oil temperature switch,
-low-oil pressure switch,
-
load-compressor inlet temperature - chromel alumel thermocouple,
-
load-compressor discharge temperature - chromel/alumel
thermocouple,
-ambient pressure transducer (P2),
-
load-compressor delta pressure transducer (DELTA P),
-
load-compressor discharge total pressure-transducer (PT),
-inlet-guide vane actuator-position (LVDT),
-starter voltage,
-APU serial number encoder,
-
load control valve (open position) indication,
-
load control valve (close position) indication,
-low oil level switch,
-clogged oil filter switch(es).
R **ON A/C 063-099, 401-499,
A. Aircraft (A/C) Input Signals to the ECB 59KD
------------------------------------------------------------------------
INPUT SIGNAL SIGNAL
------------------------------------------------------------------------
Master Switch/Stop Ground/Open
Start 28 V DC
Environmental Control System (ECS) ARINC 429 BUS
air demand
Main Engine Start (MES) 28 V DC
Emergency Shutdown Ground
Bleed-air Valve Operation Ground
Air/ground Signal Ground for ground
condition
A/C Parameter and Centralized Fault ARINC 429 BUS
Display System (CFDS)
Start Contactor Monitor Signal Open/28 V/ground
TSO/JAR Configuration Open/Ground
for TSO Configuration
Air Intake Actuator 28 V DC
Start Valve Command 28 V DC
APU Oil Heater BITE enable GND for BITE enable
Fuel Low Press. Valve BITE enable GND for BITE enable
Air Intake closed switch ground
Air Intake open switch open
A/C Identification A319,A320/A321 ground for A321
(1) A/C Sensors connected to the ECB 59KD:
- low-fuel pressure switch 5030 QM
- generator oil-temperature sensor,
- air-intake position switches.
(2) ECB 59KD Output Signals to the A/C
--------------------------------------------------------------------LOAD OUTPUT SIGNAL SIGNAL STEADY CONDITION
STATE --------------------------------------------------------------------APU AVAILABLE 28 V DC 400 mA Start Contactor 28 V DC 1 A Back-Up Start Contactor 28 V DC 1 A APU Fault 28 V DC 200 mA Start in Progress 28 V DC 400 mA Load Control Valve 28 V DC 400 mA (Ref. 49-51-51 (open position) APU Main Relay Ground 400 mA Air Intake Actuator 28 V DC 1.6 A (Ref. 49-16-51 (open CMD) Air Intake Actuator 28 V DC 1.6 A (Ref. 49-16-51 (close CMD) APU System Bus ARINC 429 APU Fuel Low Pressure Relay 28 V DC 200 mA
(3)
ECB 59KD Output Signals to APU loads:
-fuel solenoid,
-fuel-control Torque Motor (TM),
-ignition unit driver,
-surge control valve (TM),
-inlet guide vanes (TM),
-de-oil solenoid,
-load-control valve solenoid,
(4)
APU Input Signals to the ECB 59KD:
-EGT (T5) chromel-alumel thermocouples (redundant),
-monopole transducer (APU speed) (redundant),
- oil-sump temperature sensor,
-high-oil temperature switch,
-low-oil pressure switch,
-
load-compressor inlet temperature - chromel alumel thermocouple,
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