Electrcal Drive/Standby Power Panel

Question 1

DRIVE light

4

Answer 1

4 things can cause this light to illuminate

1) if the IDG oil pressure is low
2) if there is an under frequency fault with the engine running
3) if the IDG automatically disconnected due to high oil temp
4) if the IDG was disconnected through the generator drive DISCONNECT switch

Question 2

STANDBY POWER OFF light

3

Answer 2

• indicates one of the following buses are unpowered
• AC standby bus
• DC standby bus, or
• Battery bus (BAT switch ON)

Question 3

STANDBY POWER switch
BAT-
OFF-
AUTO-

Answer 3

• gives auto and manual control of the ac and dc standby bus
  BAT - connects the DC standby bus to the battery bus bar and the ac standby bus to the inverter
  OFF - disconnects the standby system
  Standby Power Off light illuminates
  AUTO - arms the standby system
• ac transfer busses powered, ac standby bus is powered by ac transfer bus 1 and dc standby bus is powered by DC Bus 1

Question 4

GENERATOR DRIVE DISCONNECT switch

Answer 4

• disconnects IDG if engine start lever is in idle and engine is turning
• can only be re-engaged on the ground by maintenance via a reset handle