Alpha-technologies APU Control Module (ACM) Manuale Utente Scaricare il pdf (Pagina 24)

018-340-B0-001 Rev. A

5.0 System Self-Test and Maintenance

5.1 Self-Test

Generator testing can be initiated in four ways:

1. The ACM can be programmed to periodically run an automatic test (Default OFF).

2. A Self-Test can be commanded via status communications.

3. Momentary activation of the Engine Run command will cause the ACM to effectively run a

test. Note that this method is the least desirable because the Self-Test Fail alarm will not be

set if an alarm condition arises.

4. A one-minute automatic test is performed when the manual control switch is returned to

Auto from Stop. Generator testing consists of starting and running the generator for a

programmable period of time (the default test duration is 10 minutes). The ACM monitors

all engine-related signals and will declare a self-test as failed if any of the following alarms

activate during the test:

• Low Oil Pressure registered as a control fail

• Engine Over-temperature

• Engine Over-crank

• Low Fuel

• ACM Control Failure

• Low Ignition Battery

• Low DC Bus Voltage

The ACM will not start a self-test if the engine is disabled, the stop switch is asserted, or the

engine is already running.

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Alpha-technologies APU Control Module (ACM) Manuale Utente Pagina 24