Alpha Technologies AlphaGen 5.0kW Auxiliary Power Unit - Manual (Page 73)

4. Interconnection
73
031-132-B0-001 Rev. A TM ©2000
Pin Description Function
1 +12V Ignition Battery Ignition battery Fused 12V from APU.
2 Neg Ignition Battery Ignition Battery Negative from APU.
3 Low Oil Pressure Active LOW signal denotes Low Oil Pressure.
4 Over-Temp Active LOW signal indicates Over Temp.
5 Start Command Active LOW from ECM activates the APU START
relay.
6 Common (Start /Stop) Common return between Start and Stop relays.
7 Stop Command Active LOW from ECM activates the APU STOP relay.
8 Over-Speed Active LOW signal denotes engine RPM was exceeded.
9 Over-Crank Active LOW signal denotes Over Crank Limit is
reached.
10 Engine Run Active LOW signal denotes the Engine is Running.
11 Not Used
12 Not Used
4.3.7 Alarm Control Interface to APU Interface Connector (APU-I/O)
The interface control is a 12 pin (3x4 row) Mini Mate-’N’Lok style connector. See
Fig. 4-1 for location.
7R
(&0 -
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5HDU YLHZ
ZLUH VLGH
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5HDU YLHZ
ZLUH VLGH
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4.3 Connectors, continued
Fig. 4-8 Alarm Control Interface Connector