R EFF : 001-049, 101-105, 107-107, 151-199, 49-42-00Page 4 201-210, Config-2 Aug 01/05
CES
Starter Motor and Starter Clutch
Figure 002
CES 7. Operation/Control and Indication
________________________________
(Ref. Fig. 003)
When you put the MASTER SW pushbutton switch in the ON position:
-
the main relay 4KD is energized,
-
the ECB starts the power-up test,
-
the APU fuel pump system is energized,
-
the APU air inlet door opens,
When you put the START pushbutton switch in the ON position:
-
the ON legend in the START pushbutton switch comes on,
-
the ECB energizes the back-up start contactor 10KA and (1.5 seconds later) the start contactor 5KA, when these conditions are met: .the air intake is open, .the Power-Up Test (PUT) is complete, .the speed is less then 7 %, .an automatic shutdown is not detected, .a commanded shutdown (MASTER SW to off) is not selected. .the data exchange between the Data Memory Module (DMM) and the ECB has been accomplished (approx. 15 seconds).
-
the contactors energize the starter motor 8KA with 28 V DC and the APU starter motor starts to turn. The starter clutch engages and turns the APU main shaft,
-together with the back-up start contactor the igniter is energized,
-
the de-oil valve opens (if oil temp is below 20 deg F, 6.6 deg C or fuel temp below 10 deg F, -12.2 deg C or altitude above 20,000 ft ).
-
the APU operation data is shown on the lower ECAM display unit.
NOTE : During Ram Air Turbine (RAT) extension, APU starting is inhibited by
____
the Battery Charge Limiters (BCL 1 and BCL 2), which prevent
operation of the main start contactor 5 KA for 45s.
At 7% speed, the ECB:
- opens the fuel shutoff solenoid valve in the fuel control unit,
-controls the fuel flow to the APU with the start acceleration control logic.
-the IGVs close.
At 50% speed, the ECB:
-
de-energizes the start contactor 5KA (above 20,000 ft at 58%) which
switches off the starter motor 8KA and the ECB accelerates the APU
automatically,
-
de-energizes the back-up start contactor 10KA, after 5 seconds.
At 60% speed, the ECB:
-
de-energizes the ignition unit,
-
de-energizes the de-oil solenoid (if opened).
At 95 % + 2 s of the nominal APU speed:
-
the ECB controls and monitors the APU automatically,
-
the green AVAIL legend in the START pushbutton switch comes on,
-
the blue ON legend in the START pushbutton switch goes off.
R EFF : 001-049, 101-105, 107-107, 151-199, 49-42-00Page 6 201-210, Config-2 Aug 01/05
CES
Starting System - Block Diagram
Figure 003
CES
-
the APU bleed valve is ready for operation,
-
the APU generator is ready for operation.
R EFF : 001-049, 101-105, 107-107, 151-199, 49-42-00Page 8 201-210, Config-2 Aug 01/05
CES STARTING - DESCRIPTION AND OPERATION
____________________________________
1.
General
_______ The starting system rotates and accelerates the rotor of the APU to 55% of the APU's usual speed. You can operate the starting system from the APU panel in the cockpit. The Electronic Control Box (ECB) 59KD controls the start sequence of the APU. Three consecutive start attempts are permitted without cooldown. After the third start attempt the starter motor must cool down for at least 60 minutes.
2.
Component Location
__________________
(Ref. Fig. 001)
-------------------------------------------------------------------------------FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA | | | | DOOR | REF.
-------------------------------------------------------------------------------2KA START SWITCH 25VU 210 5KA START CONTACTOR 120VU 212 6KA FUSE - APU START SUPPLY 120VU 212 132AZ 8KA STARTER MOTOR 313 315AL/ 49-42-51
316AR 10KA BACKUP START CONTACTOR 120VU 212
3. System Description
__________________
(Ref. Fig. 001, 002)
The primary parts of the starting system are:
