DC CONTROL PANEL CALLOUTS (cont’d)
4. BATTERY MASTER SWITCH (two position, lever locked at OFF)
BATTERY MASTER
- any battery is capable of powering both essential buses
- switch control is hard wired and independent of EPCU operation
OFF
- disconnects the main, auxiliary, and standby batteries from the associated essential
buses
NOTE:
The battery master switch must be selected to BATTERY MASTER before the main,
auxiliary, and standby batteries can power the respective buses.
5. GEN 1 and 2 SWITCHES (two position)
GEN 1 OR 2
- DC GCU permits generator to supply power to the associated feeder bus
- DC generators are inhibited with DC EXT PWR ON
OFF
- shuts associated generator off
- resets GCU for subsequent generator and circuit monitoring following shutdown of a
generator
- DC GEN 1 or 2 caution light turns on anytime the respective generator is not supplying
power to its associated feeder bus
6. MAIN BUS TIE SWITCH (two position, lever locked at OFF)
MAIN BUS TIE
- manually ties left and right main feeder buses.
- EPCU inhibits bus tie operation upon detection of a bus fault
OFF
- manually opens connection between left and right main feeder buses
7. BUS FAULT RESET SWITCH (momentary selection)
BUS FAULT RESET
- re initializes the EPCU after a bus isolation (following a bus fault) to
enable subsequent bus fault monitoring
Dash8 - Q400 - Electrical
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