3kw tqg dc & ac electrical system
TRANSCRIPT
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52D33F01
3KW TQGDC & AC Electrical System
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ACTION: Perform Diagnostic Procedures on the Electrical Control System of a Generator Set
CONDITONS: In a contemporary operational environment, given a 3 KW TQG Generator Set, general mechanic's tool kit, multimeter, schematic and wiring diagram, color/grease pencils, and TM 9-6115-639-13.
STANDARD: Determine the cause of the generator engine electrical circuitry malfunction IAW applicable references, correctly and safely complete the practical exercise and score a 70 percent or better on the End of Module Test
Terminal Learning Objective
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Safety Requirements:
Safety considerations required for this lesson are the removal of all jewelry and ID tags. Mechanical moving parts are hazards, electrical components, hot exhaust components, eye and hearing protection.
Risk Assessment Level: Low
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It is the responsibility of all soldiers to protect the environment from damage. Generators have fuel, oil and anti-freeze hazards.
Environmental Considerations:
Evaluation: This lesson will be evaluated by an end of Module Job Knowledge Test
and a Job Performance Test.
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Characteristics
• Two Models: 60Hz (MEP 831A) and 400Hz (MEP 832A)• Skid mounted with forklift provisions• Six lifting handles, four tie-down rings• Hinged enclosure allows quick access for preventive and scheduled maintenance• Thermostatically controlled, two fan enclosure cooling system• 24VDC cranking system• Single cylinder, air cooled, direct injection, four-stroke cycle diesel engine• Permanent magnet AC generator with power inverter / converter
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• Four-gallon fuel tank (allowing 8 hours of continuous operation at full load)
• 3000 to 3450 RPM operating speed
• 3.0 kilowatt, 1 phase, 2 wire, 120VAC or 1 phase, 3 wire, 120/240VAC
• Rated engine horsepower of 6.7 HP at 3600 RPM
• Equipped with a 24VDC NATO slave receptacle
• Equipped with a two-plug 120VAC convenience receptacle with Ground Fault Circuit Interrupter (GFCI) for the 120VAC convenience receptacle (MEP 831A, 60 Hz only)
Characteristics
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DC Electrical System • Crank
• Fuel Transfer
• Electronic Governor
•Battery Charging
•AC Circuit Interrupter
• Safety
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Crank Circuit
• Batteries• S1• CB1• L4• B1• K2• CR1
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CIRCUIT COMPONENTS
BT1-24VDC
S1(SWITCH)-START/STOP
CR1(Current Rectifier)-Reverse Polarity Protection
CB1(Circuit Breaker)-Main DC Circuit Breaker
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B1-Starter Motor
K2 (Coil)-Crank Relay
L4-Starter Solenoid
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Crank Circuit
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Now energize L4 solenoid
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From K2-A1 takes same path to Batteries
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Fuel Transfer Circuit
• E2 Fuel Pump • CR2 Diode
Circuit Components
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Fuel Transfer Circuit
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From S1-2 takes same path to Batteries
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Electronic Governor Circuits
• 24 VDC: Battery Input
• 175 VAC: Input from main generator
• Load Input: From the A8
• 20-32 VDC: Output to A6
Function:Controls engine’s mechanical governor to adjust engine speed.
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Electronic Governor Circuits
• A5 Speed Control Unit
• A6 Actuator
• K12 contacts
• G1 Main Generator
• A8 Power Converter
Circuit Components
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Speed Control Circuits
DC Output to Actuator(20-32VDC)
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175 VAC Input to A5
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Speed Control Circuits
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175 VAC Input to A5
To Electronic GovernorLoad Reference Input
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Speed Control Circuits
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175 VAC Input to A5
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Pick up potential at TB5-15B
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From TB5-4A takes same path backTo the batteries
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Pick up potential at A5-J
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175 VAC input to A5
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Load input to A5
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Battery Charging System
ComponentsG1 Main GenA9 Regulator
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Battery Charging
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Battery Charging Circuit
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Battery Charging
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DC OUTPUT (20VDC to 32VDC)AC INPUT FROM MAIN GENERATOR - A9(32VAC to 50VAC)
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A9 Output to Batteries
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Neg Feedback to A9
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AC Circuit Interrupter
• K1 AC Circuit Interrupter
• S5 Switch AC Interrupter
• K8 Contacts
• K12 Contacts
• K15 Contacts
Components
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Pick up Potential At TB5-15A
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Pick up Potential S5-4 for Holding contacts
From K1 take same path backTo the batteries
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From K1 take same path backTo the batteries
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Safety Circuit
• A2 Malfunction Group
• K12 Fault Relay
Components
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Low Oil Shut Down
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From S1-3 take same path backTo the batteries
Pick up potential at P4-3Low oil shut down
Pick up potential at S7-2
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From S1-3 take same path backTo the batteries
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AC Circuits
• Generator Output – 120VAC• Generator Output – 240VAC• Venting Fan
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GENERATOR OUTPUT – 120VAC2 Wires
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GENERATOR OUTPUT – 120/240VAC3 Wires
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Venting Fan
85 Degrees
110 Degrees
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