Crj-200 Electrical

Front 1

At what kVA are the APU generators rated?

Back 1

30kVA

Front 2

Name the 6 AC buses that receive power from the main generators

Back 2

AC 1 & 2
AC Utility 1 & 2
AC Essential
AC Service

Front 3

What are the sources of power for 28V DC

Back 3

TRUs or ground power

Front 4

What is the volt and amp hour rating for the MAIN and APU battery

Back 4

17 Amp/hr, 24 volt main battery, 43 Amp/hr, 24 volt APU battery

Front 5

Name the 5 TRUs

Back 5

TRU 1 & 2
TRU Essential 1 & 2
TRU Service

Front 6

Name the 7 DC buses

Back 6

DC 1 &2
DC Utility 1 & 2
DC Essential
DC Service
DC Battery

Front 7

Cranking power for starting the APU is provided by:

Back 7

APU battery via ECU

Front 8

What is the rating for the air driven generator?

Back 8

115 volt, 400Hz AC power rated at 15kVA

Front 9

What does the ADG supply power to?

Back 9

ADG Bus, which subsequently powers AC ESS Bus and its dependents.

Front 10

What powers the MAIN and APU battery charger?

Back 10

Main – AC utility bus 1, APU – AC utility bus 2

Front 11

Where is the external AC power receptacle located?

Back 11

Forward right side of the fuselage

Front 12

Where is the external DC power receptacle located?

Back 12

Right engine pylon

Front 13

Where are electrical system warnings and caution messages displayed?

Back 13

EICAS primary page

Front 14

Where are electrical system status and advisory messages displayed?

Back 14

EICAS AC and DC synoptic pages.

Front 15

What does the constant speed drive do?

Back 15

Maintains constant RPM for the Integrated Drive Generators (IDG) by hydro-mechanically changing the variable input speed from the engine gearbox.

Front 16

What will cause the IDG’s to auto disconnect from the gearbox?

Back 16

In a severe overtemperature or overtorque condition. Indicated by sheared Quill Shaft (overtorque) or fused Solder Ring (overtemp)

Front 17

What will cause the illumination of the IDG fault light?

Back 17

In low oil pressure or high oil temperature, the amber cover-guarded switchlight (safety version of a PBA) on the EPSP will illuminate (broken Quill Shaft or fused Solder Ring).

Front 18

Describe how the IDG is disconnected when the IDG DISC switch is pushed.

Back 18

IDG Fault PBA is uncovered, then pressed, which disconnects the IDG from the engine gearbox.

Front 19

Can the IDG be reconnected in flight after it is disconnected.

Back 19

No – only on ground, after landing, and without engines running

Front 20

What is the RPM that the generators need to turn at in order to produce the correct output?

Back 20

12,000 RPM

Front 21

What provides fault protection for each generator?

Back 21

Generators are monitored by Generator Control Units (GCUs) for voltage, frequency, and amperage to provide fault-protective shutdowns.

Front 22

List the priority for allowing power to AC Bus 1 and AC Bus 2.

Back 22

AC Bus 1: IDG 1, APU, IDG 2, External Power;
AC Bus 2: IDG 2, APU, IDG 1, External Power

Front 23

What supplies power to the TRU’s and what are their output ratings? (power supply for each of 2 Normal TRUs, 2 Essential TRUs, 1 Service TRU)

Back 23

AC Bus 1 – TRU 1
AC Bus 2 – TRU 2 & ESS TRU 2
AC ESS – ESS TRU 1
AC SERV – SERV TRU
Rated at 100Amp, 28Volt

Front 24

Explain how DC BUS 1 and DC BUS 2 are provided with backup power and what switches are used to control this backup?
NOT INCLUDED - NO ANSWER AVAILABLE

Back 24

Backup from opposite side TRU 1 or 2 through TIE 1 and TIE 2
For instance, TRU 2 fails. Both TIE 1 AND TIE 2 must close, disabling DC UTIL BUS 1 AND 2, but providing power to DC BUS 2

Front 25

What will cause the ADG to auto deploy?

Back 25

During complete AC power failure in flight

Front 26

What busses provide power to the battery chargers?

Back 26

AC Utility Bus 1 – Main Battery
AC Utility Bus 2 – APU Battery

Front 27

On the ground, when are the battery chargers powered?

Back 27

Flaps at 0 degrees
Main door open
External AC power disconnected

Front 28

What will cause the battery chargers to auto shut-down?

Back 28

If there is a fault in the battery itself or when charging exceeds 90 minutes.

Front 29

What are the modes of operation for the battery chargers?

Back 29

MAIN and TOPPING

Front 30

When do the battery chargers switch modes of charging?

Back 30

When battery temperature is either above or below -29C.
Above -29C = MAIN
Below -29C = TOPPING

Front 31

What are the amp outputs in the different modes of charging for the APU and Main Battery chargers?

Back 31

MAIN – main battery @ 20 Amps, APU battery @ 40 Amps.
TOPPING – main battery @ 5 Amps, APU battery @ 10 Amps.

Front 32

At what temperature will the IDG fault light come on?

Back 32

160 degrees Celsius

Front 33

What does a fail light illuminated by one of the auto transfer switches indicate?

Back 33

A fault preventing autotransfer

Front 34

Selecting the ADG unit test switch to unit checks what?

Back 34

ADG system circuits

Front 35

"Ampere"

Back 35

A measure of electric flux

Front 36

"Volt"

Back 36

A measure of electric power

Front 37

"Watt"

Back 37

A measure of electric work

Front 38

"Ohm"

Back 38

A measure of resistance to electric flux

Front 39

"DC"

Back 39

Direct (electrical) current

Front 40

"AC"

Back 40

Alternating (electrical) current

Front 41

"Cycle"

Back 41

A single unit which is part of a repeating process
OR
to rotate or actuate a circuit breaker, valve, or connection

Front 42

"Period"

Back 42

The duration from one point in a cycle to its appearance in the next full cycle.

Front 43

"Frequency"

Back 43

repititions of periods per given unit of time

Front 44

"Phase"

Back 44

moment of positive or negative current in AC power. A single current may have multiple phases, such as the ADG, which provides 3-phase power.

Front 45

"Transformer"

Back 45

Mechanical unit which increases or decreases voltage

Front 46

"TRU"

Back 46

Transformer-Rectifier Unit
Performs all actions of a normal transformer, in addition to converting AC to DC power.

Front 47

"Inverter"

Back 47

Converts DC to AC power

Front 48

"Series Circuit"

Back 48

A circuit wired in-line so that all power is constant regardless of individual resistance (all units fail of circuit is broken, but maintains more uniform power).

Front 49

"Parallel Circuit"

Back 49

A circuit where each item is on separate links so that a single failed wire will not power down the rest of the units on the circuit (Amperage shifts in all lines if any line is broken)

Front 50

"CSD"

Back 50

Constant Speed Drive
Mechanical gearing which contains a hydromechanically actuated monitor to increase or decrease incoming mechanical power and maintain a constant RPM output.

Front 51

What does the main battery provide backup power for? (6)

Back 51

AHRS (Attitude Heading Reference System)
PSEU (Proximity Sensor Electronic Units)
APU ECU (Electronic Control Unit)
EICAS DCUs (Data Concentrator Units)
Clocks
Flight Compartment Lighting

Front 52

"EPSP"

Back 52

Electrical Power Services Panel