a/c generator systems. what is the function of the charging system? provide power for all electrical...
TRANSCRIPT
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A/C Generator Systems
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What is the function of the charging system?
Provide power for all electrical loads
Recharge the starting battery
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What happens if the charging systems puts out too much power?
Voltage goes UP
What happens if the charging system puts out too little power?
Voltage goes DOWN
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What is the proper system voltage? 13.8 - 14.8 volts
27.4 – 28.4 volts
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What controls the system voltage?
Voltage regulator
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How many volts in a fully charged battery?
12.6 volts
25.2 volts
After removing surface charge
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How do you check for an Over-charging alternator?
Insure battery is fully charged
Run the engine
Turn Off electrical loads
System voltage below… …14.8 Volts or 28.4 volts When less than 8 amps enter battery
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What can cause the charging system to Over-charge?
Defective Voltage Regulator
Volt Drop in Voltage Sensing Wire
Volt Drop in regulator ground
Having regulator inside generator eliminates volt drop as a cause for Over-Charging
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How do you check for an Under-charging alternator?
Insure battery is fully charged
Run ALL electrical loads
Run engine at 1,500 RPM
System voltage above… …13.8 Volts or 27.4 volts
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How else do you check for an undercharging alternator?
Run engine at 1,500 RPM
Load battery with carbon pile to 13 volts (26 volts)
Measure amps leaving generator
Should be at least 90% of rated capacity
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What can cause the charging system to under-charge?
Loose fan belt
Low engine RPM
Excessive load requirements (add on accessories)
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What can cause the charging system to under-charge?
Short driving trips
Defective generator
Defective voltage regulator
Defective wiring
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Understand the A/C Generator(Alternator)
Identify the following components
Rotor
Stator
Slip rings
Brushes
Diodes or Rectifier
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Rotor, creates spinning magnetic field
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Stator, creates alternating current
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Slip Rings, allow field current into the rotor
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Brushes, allow field current into rotor
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High tech brush installation tool
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Rotor (Field)
What does the Rotor do?
Creates a spinning magnetic field inside the A/C generator
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How do you test the rotor?
Slip rings must be clean and smooth
Field windings must not be open circuit
Field windings must not be shorted to ground
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Clean slip rings
Burned slip rings
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3.1 OL Good Rotor
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OL 0.3 Bad Rotor
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Stator Windings
What does the Stator do?
Creates electrical power when a magnetic field is moved past it
Creates power to recharge battery and run electrical loads
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What does the Stator do?
Creates an Alternating Current
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Voltage Trace for One Stator Winding
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Voltage Trace for Three Stator Windings
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How do you test the Stator?
Test for open circuits in the windings
Test for grounded windings
Visually inspect for burning or overheated windings
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0.3 0.3 OL
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How does the A/C currentchange into D/C current
Diodes are used for Full Wave Rectification
Diodes are often called rectifiers
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Full Wave Rectification …... one stator winding
A/CD/C
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Full Wave Rectification …... one stator winding
A/CD/C
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Full Wave Rectification …... one stator winding
A/CD/C
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Full Wave Rectification …... three stator windings
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Actual voltage trace of each stator winding after full wave rectification
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voltage trace on oscilloscope
(diode pattern)
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Stator
Rectifier (Diode pack)
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Positive Diode Heat-sink
Stator Wires
Voltage Regulator
Negative Diode Heat-sink
B+Main Charge
Terminal
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Positive Diodes
Negative DiodesStator windingsRotor (Field)
B+
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Test the electrical integrity of the diodes
Use an A/C voltmeter, or oscilloscope while the alternator is loaded
Turn on accessories, or put 40 amp draw on carbon pile
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Here is a normal diode pattern
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Here is a normal diode pattern
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Open diode pattern
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Shorted diode pattern
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Scope set for A/C voltage
Are these good or bad diodes?Practice and it gets easy to spot defective diode patterns!
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Practice with Diode Patterns
• Different alternator diodes give slightly different diode patterns
• If you look at many different alternator diode patterns you will learn to quickly spot bad diodes
• Defective diodes can cause many engine performance problems
• Do not forget to load the system
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How can you increase the amperage coming out of the generator?
Increase engine RPM
(This is limited to about 2500 RPM)
Increase the rotor’s magnetic field strength
Use a Delta stator winding
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Y stator = lower outputDelta stator = higher output
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How does the voltage regulator control the A/C generator?
The regulator will turn on/off current to the field windings (rotor)
Increasing current to the rotor…
…will increase generator output
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How does the voltage regulator control the A/C generator?
Regulators are wired to the Ground side of the Rotor in an A type circuit
and wired to the Battery side of the Rotor in a B type circuit
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“A” circuit regulator
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“A” circuit regulator
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“B” circuit regulator
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“B” circuit regulator
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Voltage regulators monitor
Voltage
Temperature
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1 V
14 V
80 o F
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2 V
15 V
80 o F
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1 V
15 V
20 o F
Cold = higher volt drop across thermistor
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2 V
16 V
20 o F
Cold = higher volt drop across thermistor
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Voltage should:increase when cold, decrease when hot.
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Explain how charging system indicators work
Idiot light
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Explain how charging system indicators work Idiot light
Voltmeter
Ammeter
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Diagnose Over/Under Charging
Insure there is no Voltage drop in wiring harness
Undercharge is bad alternator or regulator
Overcharge is bad regulator
IF there are no bad wires or connections
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Field is ONAlternator charging
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Field is OFFAlternator not charging
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Field is ONAlternator charging
Voltage too high causing Overcharge
Overcharge caused by volt drop in wires
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Field is ONAlternator charging
Voltage too high causing Overcharge
Overcharge caused by volt drop in groundOvercharge caused by
volt drop in ground
Regulator only “sees” 14.5 volts
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Field is OFFAlternator not charging
Regulator “sees” alternator voltageVolt Drop in battery cables
will cause undercharging
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Test the Charging System
• Test belts, battery condition and wiring to ensure trouble free power
• Test for Overcharging (with full charge on battery)
• Test for Undercharging
• Test for A/C voltage