Pic. 7-4. Generator 9402.3701-01:
1 - rectifier block;
2 - bearing sleeve;
3 - rear bearing of the rotor shaft;
4 - contact rings;
5 - protective sleeve;
6 - conclusion «B+» generator;
7 - gasket;
8 - casing;
9 - voltage regulator with brush holder;
10 - coupling screw;
11 - back cover;
12 - stator;
13 - front cover;
14 - remote ring;
15 - front bearing;
16 - pulley;
17 - washer;
18 - rotor.
Stator 12 (pic. 7-4) and covers 11 and 13 are tightened with four screws. The rotor shaft 18 rotates in bearings 3 and 15, which are installed in the covers. Power to the rotor winding (excitation winding) supplied through brushes and slip rings 4.
The three-phase alternating current induced in the stator winding is converted into a direct current by a rectifier unit 1 attached to the cover 11. The electronic voltage regulator 9 is combined into one unit with a brush holder and is also attached to the cover 11.
The generator connection diagram is shown in fig. 7-5. The voltage to excite the generator when the ignition is turned on is supplied to the output «D+» regulator (conclusion «D» generator) through a control lamp located in the instrument cluster 3. After starting the engine, the excitation winding is powered by three additional diodes installed on the generator rectifier unit.
Pic. 7-5. Generator system wiring diagram:
1 - battery;
2 - generator;
3 - control lamp of the battery charge, located in the instrument cluster;
4 - mounting block;
5 - ignition switch.
Conclusion «W» generators for cars «Chevrolet Niva» not used.
The operation of the generator is controlled by a warning lamp in the instrument cluster. When the ignition is turned on, the lamp should be on, and after starting the engine, it should go out if the generator is working. The bright burning of the lamp or its glow in full heat indicates malfunctions.
Warning. «Minus» battery must always be connected to ground, and «plus» - connect to clamp «B+» generator. An erroneous reverse connection of the battery will immediately cause increased current through the rectifier block of the generator.
The generator must not be operated with the battery disconnected. This will cause transient overvoltages on the terminal «B+» generator, which can damage the generator voltage regulator and electronic devices in the vehicle's on-board network.
It is forbidden to check the operability of the generator «for a spark» even short-term clamp connection «B+» mass generator. In this case, a significant current flows through the rectifier unit of the generator and it can fail. You can only check the generator with an ammeter and a voltmeter.
The rectifier unit of the generator is not allowed to be checked with a voltage of more than 12 V or with a megohmmeter, as it has a voltage too high for the diodes and they will be broken during the test (a short circuit will occur).
It is forbidden to check the car's electrical wiring with a megohmmeter or a lamp powered by a voltage of more than 12 V. If such a check is necessary, then first disconnect the wires from the generator.
It is necessary to check the insulation resistance of the generator stator winding with increased voltage only at the stand and always with the phase winding leads disconnected from the generator rectifier unit.
When welding components and parts of the car body, disconnect the wires from all terminals of the generator and the battery.