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CASA 212 Erickson > Systems - Electrical > Flashcards

Flashcards in Systems - Electrical Deck (19)
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1

Electrical System Voltage

28v

2

Electrical System Primary Components

(2) Starter-Generators (30v Starter / 28v Generator)
(3) 24v Lead Acid Batteries (BAT 1(2) 22ah, BAT 3 7ah)
(3) Static, single-phase Inverters (400hz, 115v AC)
(1) 26v Transformer (CC-50 and earlier)

3

Starter-Generators provide power to...

...Secondary Bus Bar

4

Voltage Limits for Starting

minimum 23v maximum 29v

5

Amperage before Second Engine Start

below 100amps

6

Starter-Generator functions as Starter until

60% RPM
Automatically Disconnected

7

Starter-Generators may be brought online as Generators at

65% RPM
RESET then ON

8

Cross-Generator Start Engine RPM

80%

9

If a fault develops on the SEC BUS the Generators will...

...be automatically transferred and provide power to the ESS Bus Bar

10

When can the Generators be transferred back to the SEC BUS

-on the ground
-after maintenance
-utilizing the GEN to SEC BUS switches

11

Each Generator Control Box protects against

overvoltage
reverse current flow
ground faults

12

Each Generator Control Box serves to

equalize and regulate 28v DC
provide protections

13

Each Generator Control Box can be tested to...

... simulate either --
-- overvoltage
-- ground fault

testing illuminates the GENERATOR warning light on the glareshield panel

14

Batteries Provide Power to...

BAT 1 - ESS BUS
BAT 2 - START BUS
AUX BAT - PRIMARY BUS

15

AUX BAT function during start cycle

to supply constant voltage to critical temperature indication and starting systems

16

AC Power Provided by:

3 static, single-phase, 400hz, inverters
-- convert 28v DC to 115v AC
26v Transformer converts 115v AC to 26v AC

17

No. 1 and No. 2 Inverters power

No. 1 and No. 2 Inverter Bus Bar, respectively
-- powered by AUX BAT BUS (PRIMARY BUS BAR) --

18

AUX Inverter

powered by ESS BUS
can power either No. 1 or No. 2 INV BUS

19

48v Start Recommended

-- first start of the day
-- OAT below 5ºC