electrical system

TM-55-2835-208-23 Transportability Guidance Small Emplacement Excavator (SEE) High Mobility Entrencher (HME) High Mobility Material Handler (HMMH) Manual
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1-13 Change 5 1-15. TM 55-2835-208-23 A B C D E F G MAGNETIC PICKUP. The magnetic pickup provides speed signals to the electronic sequence unit (ESU) in the aircraft. ELECTRICAL HARNESS . A single harness connects all electrical components of the APU to the Main electrical connector. Connection to the aircraft electrical system is through this main electrical connector to the harness. Refer to schematic for electrical harness details. IGNITION EXCITER. The ignition exciter is a capacitor-discharge type. The exciter converts direct-volts input to a high-potential alternating voltage for ignition. IGNITION CABLE. The ignition cable connects the ignition system to the igniter plug. IGNITER PLUG. A shunted-gap type igniter plug provides the igniter for initial ignition of fuel during start of the APU. THERMOCOUPLE. A single-element, chromel/alumel thermocouple is part of the electrical harness. The thermocouple senses exhaust gas temperature (EGT) and provides the signal to the ESU. The output signal is used by the ESU for overtemperature protection, shutting down the APU if EGT exceeds safe limits. METER ASSEMBLY. The meter assembly provides accurate tracking of APU operational hours and number of starts for purposes of maintenance,

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