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Electrical Contactor Management Unit
Also from: ECMU
There are 2 ECMUs, each controlling its side of the electrical bus, which reconfigure depending on which power sources are available. They provide:
- AC and DC contactor control
- galley shedding control
- NBPT control
- monitoring and indicating
Contactor control
| ECMU 1 | GLC 1 |
| AC BTC 1 | |
| APU generator contactor | |
| both DC tie contactors | |
| BUS tie contactor (also called system isolation contactor, SIC) | |
| external power contactor B | |
| ECMU 2 | GLC 2 |
| AC BTC 2 | |
| external power contactor A | |
| both DC tie contactors |
Failures
| ELEC ECMU 1(2) FAULT | - there is no change to the AC configuration - there is a change in DC configuration |