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Channel 2: Analog and Discrete Input Parameters
-------------------------------------------------------------------------------
| PARAMETER DEFINITION | EXT| APU| STATE | COMMENTS |
| | PWR| | | |
|-----------------------------|----|----|-------------|-----------------------|
| POR VOLTAGE 115VAC 400 Hz | X | X | | Parameter for defini- |
| (PHASE A) | | | | tion of AC voltage |
| | | | | and frequency |
|-----------------------------|----|----|-------------|-----------------------|
| AC LOAD | | X | | |
| | | | | |
|-----------------------------|----|----|-------------|-----------------------|
| OVERLOAD WARNING | | X | Ground when | |
| | | | overload | |
|-----------------------------|----|----|-------------|-----------------------|
| GENERATOR FAULT | | X | 28 VDC when | From aircraft 28 VDC |
| | | | FAULT | (through power ready) |
|-----------------------------|----|----|-------------|-----------------------|
| GEN P/BSW POSITIOM | | X | 28 VDC when | From GCU TR source |
| | | | ON | (through PR) |
|-----------------------------|----|----|-------------|-----------------------|
| EXT PWR AVAILABLE | X | | 28 VDC when | |
| | | | available | |
|-----------------------------|----|----|-------------|-----------------------|
| Class II FAILURE | X | | Ground when | |
| | | | message | |
|-----------------------------|----|----|-------------|-----------------------|
| EXT PWR ON | X | | Ground when | |
| | | | ON | |
-------------------------------------------------------------------------------
Channel 2: Flip-Flop Circuit
-------------------------------------------------------------------------------| INPUT | STATE | COMMENTS | |---------------------------------------|-------------|-----------------------| | 28 VDC VIA EXT PWR P/BSW | 28 VDC when | | | | P/BSW ON | | -------------------------------------------------------------------------------
Each EGIU includes a one shot circuit controlled by EXT PWR pushbutton switch allowing to latch the EPC auxiliary relay. This device is located on channel 2 of EGIU.
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(Ref. Fig. 006)
The supply of each channel of the unit is provided:
-either by 28 V back-up (from busbar 3PP),
- or by 28 VDC delivered by the associated control unit (GCU or
GPCU). A 5 VDC supply is provided to the FAULT legend of the GEN pushbutton switches.
B. System Data Acquisition Concentrator (SDAC) Communications
(Ref. Fig. 007)
Each EGIU channel interfaces with each SDAC via a single ARINC 429 data
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