KV ERJ Electric Panel (6)

Question 1

When do the amber IDG lights illuminate?

Answer 1

1) “HOTLOP” – Hot Oil Temperature / Low Oil Pressure.
2) IDG oil pressure drops below 140 psi ± 25 psi,
3) or the oil temperature 335°F ± 10°F (168°C ± 5°C),
4) EICAS message IDG 1(2) OIL is displayed
5) amber LED illuminates near the IDG selector knob
(AOM V2 14-05-05.8)

Question 2

With the GPU switch pushed in and reading “AVAIL” what buses are being powered?

Answer 2

AVAIL Means that the GPU is not providing power to the aircraft yet, if we assume we are in the Safety and Power Up Check - list. Essentially we are in Batt only DC power and essentially EMERGENCY ELECTRICAL Power The only systems functioning a this time will be:

1) HOT BAT BUS1/2
2) DC BUS 1/2
3) AC ESS BUS
4) DC ESS BUS 1/2/3
5) AC STBY BUS

If GPU is IN USE
The AC GPU can supply power to all AC BUSES.
(AOM V2 14-05-10.1)
The DC BUSES are also powered through the use of TRUs.
(Schematic AOM V2 14-05-40.6)

Question 3

The IDG’s are capable of supplying how much power to the electrical system?

Answer 3

1) 40 kVA,
2) 115 VAC,
3) 400 Hz, three-phase.
(AOM V2 14-05-10.1)

Question 4

Why is the switch position for Battery 2 labeled “AUTO” instead of “ON”?

Answer 4

During the APU starting cycle, BATT 2 is isolated from the network, powering the APU START BUS exclusively.

(AOM V2 14-05-10.2)

Question 5

If Battery 2 is inoperative, is there any way to start the APU?

Answer 5

Yes.

1) A DC GPU is used to start the APU when the #2 battery is no longer available
1. a) or the battery temperature is below -20°C.

Note… The DC GPU supplies between 24 VDC – 32VDC.

(AOM V2 14-05-15.3)

Question 6

What kind of batteries are installed on the ERJ?

Answer 6

1) Two NiCd 22.8 VDC, 27 A.
(AOM V2 14-05-15.2)
2) Fly by wire back up battery - DC ESS 3 Bus
Sealed Lead Acid Battery Cells with built in BIT Capability.
(AOM V2 14-08-10)