Caple use and maintenance Especificações descarregar pdf (Página 18)

744-862-C0-003 Rev.C

Engine Control Module (ECM)

1.2 Theory of Operation, continued

1.2.4. Normal APU Shutdown

The ECM will initiate a normal APU shutdown when AC line is

qualified, DC bus alarm is not active, the 12 minute cool-down

period has elapsed, and the Engine Run command is not active.

Otherwise, the ECM will continue to run the APU until the above

conditions are met or a major alarm occurs. Also, the APU will

run for a minimum of 30 minutes if started due to low DC Bus

voltage.

1.2.5. Abnormal APU Shutdown

The ECM will immediately shutdown the APU under the following

conditions:

• Major alarm

• Activation of manual engine stop switch

• Receipt of software engine stop command

• General generator failure

Crank Cycle

Crank

Attempt

Cranking

Engine

Pause

(no crank)

15 Sec 15 Sec 15 Sec 15 Sec 15 Sec 15 Sec 15 Sec 15 Sec 15 Sec

Engine

Overcrank

Alarm

30 Sec30 Sec60 Sec30 Sec30 Sec60 Sec30 Sec30 Sec

12345 678 9

Table 1-1 Normal Mode Crank Cycle

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 49 50

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Caple use and maintenance Especificações Página 18