Alpha-technologies APU Control Module (ACM) Uživatelský manuál stáhnout pdf (Strana 15)

018-340-B0-001 Rev. A

3.0 Indicators, Controls and Connectors, continued

3.1 Indicators

The Major and Minor alarm LEDs (1, 2) are red and reﬂ ect the state of the discrete major and

minor alarms monitored by the ACM. A Major alarm indicates failure of a critical component

or some other situation (pad shear, for example) where the system either has gone off-line,

or system failure and/or shutdown is imminent. Major alarms cause the engine to shutdown

immediately and generally prevent further operation. Most major alarms are latched by the

ACM. A site check by service personnel is required to repair the fault and clear the system. A

Minor alarm indicates a system fault which, though not indicative of imminent system failure

or shutdown, requires service attention as the fault condition could worsen leading to a shut

down the system. A site check by service personnel is recommended. The amber Notify LED

(3) represents status information that is not signiﬁ cant enough to be classiﬁ ed as an alarm.

At present, only two items ﬁ t into this category: AC line status and Engine Service Required.

The Communications LED (4) illuminates for two seconds after each communications session

on the Alpha bus. This is a standard that is used throughout the Alpha bus communications

system. The green System status LED (5) indicates that the microprocessor has power and is

operating normally. This LED ﬂ ashes at a 1 Hz rate with a 50% duty cycle. When the ACM is

in factory test mode, this LED will ﬂ ash at a 0.5 Hz rate.

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Alpha-technologies APU Control Module (ACM) Uživatelský manuál Strana 15