A/C Generator Systems
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1 A/C Generator Systems
2 What is the function of the charging system? Provide power for all electrical loads Recharge the starting battery
3 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
4 What is the proper system voltage? volts What controls the system voltage? Voltage regulator
5 How many volts in a fully charged 12.6 volts battery? After removing surface charge
6 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 When less than 8 amps enter battery
7 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
8 How do you check for an undercharging alternator? Insure battery is fully charged Run ALL electrical loads Run engine at 2,000 RPM System voltage above 13.8 Volts
9 What can cause the charging system to Loose fan belt under charge? Low engine RPM Excessive load requirements (add on accessories)
10 What can cause the charging system to under charge? Short driving trips Defective generator Defective voltage regulator Defective wiring
11 Understand the A/C Generator (Alternator) Identify the following components Rotor Stator Slip rings Brushes Diodes or Rectifier
12 Rotor, creates spinning magnetic field
13 Stator, creates alternating current
14 Slip Rings, allow field current into the rotor
15 Brushes, allow field current into rotor
16 Rotor (Field) What does the Rotor do? Creates a spinning magnetic field inside the A/C generator
17
18
19 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
20 What does the Stator do? Creates an Alternating Current
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25 How does the A/C current change into D/C current Diodes are used for Full Wave Rectification Diodes are often called rectifiers
26
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28 A/C D/C Full Wave Rectification... one stator winding
29 A/C D/C Full Wave Rectification... one stator winding
30 A/C D/C Full Wave Rectification... one stator winding
31 Full Wave Rectification... three stator windings
32 Actual voltage trace of each stator winding after full wave rectification
33 voltage trace on oscilloscope (diode pattern)
34 Stator Rectifier (Diode pack)
35 Positive Diode Heat-sink Negative Diode Heat-sink B+ Main Charge Terminal Stator Wires Voltage Regulator
36 Rotor (Field) Negative Diodes B+ Positive Diodes Stator windings
37 Test the electrical integrity of the diodes
38 Here is a fairly normal diode pattern
39 Here is a fairly normal diode pattern
40 Open diode pattern
41 Shorted diode pattern
42 Practice and it gets easy to spot defective diode patterns! Scope set for A/C voltage
43 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
44 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 (This is the job of the voltage regulator) Use a Delta stator winding
45
46 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
47 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
48 A circuit regulator More power (ON)
49 A circuit regulator Less power (OFF)
50 B circuit regulator More power (ON)
51 B circuit regulator Less power (OFF)
52 Voltage regulators monitor Voltage ( normal range) Temperature Colder = higher charge voltage (May look like an overcharge when very cold) Warmer = lower charge voltage (May look like an undercharge when generator heats up!)
53 Advantages to computer voltage regulation PCM can more closely regulate system voltage PCM can raise idle RPM for higher electrical loads Reduced alternator drag on engine (fuel economy) when charging is not critical Diagnostic Trouble Codes (DTC s) for charging system PCM may ground or unground the Field (ROTOR) PCM may control integral regulator (inside generator)
54 Charge Indicator Lamp Most charge indicator lamps ground when the alternator output stops. Some systems feed the field (rotor) through the charge lamp. Always check this lamp to light when Key is ON and Engine is OFF
55 Charge Indicator Lamp When generator begins to charge, the charge indicator lamp will have positive voltage applied to BOTH sides of the bulb. This will remove the ground and turn off the lamp
56 Explain how charging system indicators work Idiot light (Charge Indictor) Lamp will light with key ON engine OFF and goes out when ground is lost. Voltmeter Simple to wire any power and ground to voltmeter in dash. Very inaccurate. Usually used with a Charge Indictor Lamp Ammeter
57 Ammeter Set up to read amps charging battery only. Should show charge immediately after starting engine
58 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
59 Field is ON Alternator charging
60 Field is OFF Alternator not charging
61 Voltage too high causing Overcharge Field is ON Alternator charging Overcharge caused by volt drop in wires
62 Voltage too high causing Overcharge Overcharge caused by volt drop in ground Regulator sees drops 14.5 V 14.9 V to 0.4V Field is ON Alternator charging
63 Regulator sees alternator voltage Volt Drop in battery cables will cause undercharging Field is OFF Alternator not charging
64 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
65 Alternator Testing the Bottom Line Complete records (work order) and protect vehicle Battery condition is critical (load test) Battery must be fully charged to test the voltage regulator Check Drive Belt and Wiring Harness Check Cranking Voltage and Starter Amp Draw Check for Maximum Alternator Output (watching Volts or Amps) Test Voltage Regulator & Volt Drop to Alternator Check the Diodes A/C volts and ripple pattern Perform a Parasitic Draw Test
66 Can you do this? Insuring the starting and charging systems work reliably is a critical skill for an electrical technician You will demonstrate your competence at testing Batteries, Starting systems and Charging systems This will count as part of your final test score Testing will be during the last two weeks of class
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