DC CONTROL PANEL CALLOUTS (cont’d)
8. DC EXT PWR SWITCH
EXT PWR
- left and right main feeder buses, essential buses and secondary buses powered
from DC external power source
- DC and APU generators are inhibited from connection to feeder buses
- DC EXT PWR ON vindication (green) is displayed on the MFD Electrical page when DC
external power is connected to the aeroplane
- the EPCU incorporates External DC Power Protection from too high or too low supply of
External DC power voltage
- external DC power is supplied to the aeroplane via the external DC power receptacle.
The EPCU will enable the connection of the external DC power to the aeroplane if the
applied external voltage is:
• of correct polarity, and
• its value is within 22 ± 1VDC to 31 + 0.5; 31- 0.75 VDC
- main, auxiliary, and standby batteries are connected to their feeder buses
- for the duration of engine start, the standby battery is inhibited from the left main feeder
bus
Dash8 - Q400 - Electrical
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