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Generator
Firewall
Instrument Panel Shelf
Instrument Panel
Battery
(Optional Location)
Figure 2 - Component Location Diagram
DA20-C1 AMM
Electrical Power
Doc # DA201-C1
Rev. 0 24-30-00 Page 1
19 Dec 1997
CHAPTER 24-30
DC GENERATION
1. General
The DC generation system has these components:
Component Identification
− Generator GO2430-03
− Over-voltage control relay OV2430-01
− Over-voltage sensor OV2430-02
− Generator warning light GO2430-01
− Generator circuit-breaker GO2430-02
− Generator control circuit-breaker GC2430-01
− Voltmeter VM2430-01
− Ammeter AM2430-01
− Warning light relay GO2430-04
− GEN/BAT switch GC2430-02
Chapter 24-00 Figure 2 shows the location of some of the components.
Electrical Power
DA20-C1 AMM
Page 2
19 Dec 1997 24-30-00 Doc # DA201-C1
Rev. 0
Figure 1 - Simplified Schematic Diagram
Figure 2 - Generator Performance Graph
DA20-C1 AMM
Electrical Power
Doc # DA201-C1
Rev. 0 24-30-00 Page 3
19 Dec 1997
2. Description and Operation
A. Generator
A 40 amp generator attaches to the front right of the engine. A flexible belt turns the generator.
A pulley on the engine crankshaft operates the flexible belt. The generator is the usual source of
power for the electrical system.
The nominal output-voltage of the generator is 14 volts DC ±2.5%. A rectifier and voltage
regulator are built-in to the generator. You cannot adjust the output voltage.
The generator has these connections:
− The main bus supplies power to terminal IG of the generator for excitation.
− Terminal B supplies the generator output.
− Terminal L gives failure warning.
Brushes and slip-rings transmit the field current to the rotor. The rotor has a fan for blast-cooling
the generator.
The generator can supply 40 amps continuously at engine speeds of 1742 to 2800 RPM. The
graph at Figure 2 shows the generator performance.
The generator will come on line when:
− The engine is operating.
− The battery, generator and generator control circuit-breakers are closed.
− The GEN/BAT switch is set to ON.
Electrical Power
DA20-C1 AMM
Page 4
19 Dec 1997 24-30-00 Doc # DA201-C1
Rev. 0
B. Generator Control
These components make the generator control system:
− GEN/BAT switch GC2430-02.
− Over-voltage sensor OV2430-02.
− Over-voltage relay OV2430-01.
Refer to Chapter 92 for the wiring diagram 22-2400-99-00 Sheet 1-1.
When the GEN/BAT switch GC2430-02 is set to ON, pin 2 of the over-voltage sensor OV2430-
02 receives battery voltage from the main bus #1. Pin 1 of the over-voltage sensor supplies
positive bus voltage to the coil of the over-voltage relay OV2430-01. The relay energizes. The
closed contacts of the over-voltage relay supply #1 main bus voltage to terminal IG on the
generator. The generator comes on-line.
If the over-voltage sensor senses more than 16.1 volts at its input (pin 2), the output voltage on
pin 1 goes to zero. The over-voltage relay de-energizes. This removes the excitation voltage for
the generator. And the generator goes off-line.
If you cycle the GEN/BAT switch OFF and ON after the over-voltage has cleared, the generator
will come back on line.
DA20-C1 AMM
Electrical Power
Doc # DA201-C1
Rev. 0 24-30-00 Page 5
19 Dec 1997
C. Generator Indication
These components make the generator indication system:
− GEN warning light GO2430-01. To test the warning light, push the lens in.
− Warning light relay GO2430-04.
− Voltmeter VM2430-01.
− Ammeter AM2430-01.
If the cockpit is in the usual flight configuration (all circuit-breakers closed), the warning light will
come ON in the following cases:
− The GEN/BAT switch is set to ON. The engine is not running.
− The voltage on the main bus is more than 16.1 volts.
− The generator has failed. The engine is not running.
− The lens cap on the GEN warning light is pushed (test function).
Refer to Chapter 92 for the wiring diagram 22-2400-99-00 Sheet 1-1.
When a generator failure occurs, terminal L on the generator gives a ground (through the closed
contacts of the warning light relay GO2430-04) to the GEN warning light GO2430-01. The GEN
warning light comes ON.
If the over-voltage sensor senses more than 16.1 volts at its input (pin 2), the output voltage on
pin 1 goes to zero. The over-voltage relay de-energizes. This de-energizes the warning light
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