10 - System: Electrical System

Question 1

Electrical: Which power sources can supply power to the bus bar?

Answer 1

• Starter-generator (28.5V - 4.8KW)
• Battery (24V - 16Ah)
• External Power Unit (28.5V)

(Instruction Manual - Basic 1 - Main Systems, Chapter 7, Paragraph 7.1)

Question 2

Electrical: What is the relation between the three power sources?

Answer 2

External Power Supply:

• BAT cannot cut-in
• GEN cannot cut-in, but can be operated as a starter

Generator Supply:

• When engine running
• Charging battery

Battery Supply:

• When GEN voltage drops below BAT voltage

(Instruction Manual - Basic 1 - Main Systems, Chapter 7, Paragraph 7.1)

Question 3

Electrical: What happens if <CUT OFF> push-button is pressed on the honeywell panel?

Answer 3

Cut-out BAT and GEN power supply simultaneously

(Instruction Manual - Basic 1 - Main Systems, Chapter 7, Paragraph 7.2)

Question 4

Electrical: What is the purpose of the voltage regulator?

Answer 4

Maintains the generator voltage to 28.5 V ± 0.25 V

(Instruction Manual - Basic 1 - Main Systems, Chapter 7, Paragraph 7.2)

Question 5

Electrical: What happens in case of an overvoltage (>31.5V)

Answer 5

GEN is isolated from the bus bar

(Instruction Manual - Basic 1 - Main Systems, Chapter 7, Paragraph 7.2)

Question 6

Electrical: What does the BAT and GEN lights indicate when illuminated?

Answer 6

Comes on to indicate cutting-out of the corresponding power source

(Instruction Manual - Basic 1 - Main Systems, Chapter 7, Paragraph 7.2)

Question 7

Electrical: When does the BAT.T warning light illuminate?

Answer 7

When battery internal temperature exceeds 71°C

(Instruction Manual - Basic 1 - Main Systems, Chapter 7, Paragraph 7.2)

Question 8

Electrical: At which voltage is the GEN cut-in?

Answer 8

When generator voltage exceeds the bus bar voltage by 0.5V

(Instruction Manual - Basic 1 - Main Systems, Chapter 7, Paragraph 7.4.3)

Question 9

Electrical: What is the purpose of the inverter?

Answer 9

DC power → AC power

Supplies:

• Autopilot
• Radionavigation equipment

Question 10

Electrical: Where is the main battery and the battery for the STDBY-Horizon located?

Answer 10

• Battery: Right hand hold
• STDBY-Horizon battery: Left hand hold

Question 11

Electrical: What is the function of the <GEN R> push-button on the honeywell panel?

Answer 11

Couples GEN to bus bar at the correct voltage.

• A time delay prevents resetting immidiately after an electrical fault

(Instruction Manual - Basic 1 - Main Systems, Chapter 7, Paragraph 7.4.6)