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ERJ 135/145 Loganair > Electrical > Flashcards

Electrical Flashcards

1
Q

What electrical state displays GEN 1 (2, 3, 4) OVLD

A

Current is over 400Amps

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2
Q

What is the required voltage and tolerance for GPU power

A

28Vdc +1/-2

26vdc - 29vdc

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3
Q

When is ground service bus energised

A

Batts off (BC1 and BC2 open)
GPU available

Various lights available

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4
Q

What does the ESS transfer do and when do you use it?

A

Disconnects batteries from DC busses

Activates the ESS transfer fails

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5
Q

Main battery details

A

2 x 24vdc nicad 44amp batteries
battery 2 starts APU
battery 1 isolated for stable power during APU start

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6
Q

Battery over temp EICAS caution Batt 1(2) ovtemp

A

70 degrees

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7
Q

What does AC power supply

A

TCAS
GPWS

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8
Q

Backup battery voltage/amps and purpose

A

24vdc 5 A lead acid battery for GCUs
Backup Hot bus

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9
Q

Emergency lights -

details?
criteria for lighting?

A

4 dedicated batteries
15 mins
Arm position - activates in electrical emergency

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10
Q

What voltage are the generators

A

28vDC 400 Amp

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11
Q

What happen when all 4 Generators are working

A

BTC1 Open (batteries separated)

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12
Q

What happens when 3 generators are working

A

BTC1 closed (Batteries connected)

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13
Q

Which generator is connected to which engine

A

Gen 1+3 = left engine DC bus 1
Gen 2+4 = right engine DC bus 2

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14
Q

Engine Gen overload limitations

A

400 normal
600 amp for 5 mins
800 amps for 10 seconds

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15
Q

Apu Gen overload limitations

A

400 normal below FL300
300 normal Above FL300

600 (50%) amps for 2 mins
800 (100%) amps for 5 seconds

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16
Q

What happens if 2 generators are working

A

Shed Busses open
Bus tie connectors closed

17
Q

What happens if 1 generator is working

A

-Shed busses open

-Bus tie connectors closed

18
Q

What happens if no generators are working

A

Shed busses open, bus tie connectors open, ess connectors open (DC bus 1 and 2 are lost) …. electrical emergecy

In other words the batteries are disconnected from the DC busses and only the ESS busses remain powered.

19
Q

What temperature does a battery overtemp warning display?

A

70 degrees

ERJ 135/145 Loganair (15 decks)

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