S-class W202 Mercedes
1993-2000 of release
Repair and car operation
+ 1.2. General information
+ 2. Maintenance
+ 3. Engines
+ 4. Greasing system
+ 5. Cooling system
+ 6. Heating, ventilation
+ 7. Ignition system
+ 8. Fuel system
+ 9. Transmission
+ 10. Running gear
+ 11. Steering
+ 12. Brake system
+ 13. Body
- 14. Electric equipment
14.1.2. Measuring devices
14.1.3. Equipment of measurements
14.1.4. Electric equipment checks
14.1.5. Sound signal
14.1.6. Replacements of safety locks
+ 14.1.7. Storage battery
- 14.1.8. Generator
188.8.131.52. Diagnostics of malfunctions of the generator
+ 14.1.9. Starter
14.1.10. Traction relay
+ 14.1.11. Lighting system
14.1.14. Filament lamps on the dashboard
14.1.15. Light switch
14.1.16. Radio receiver
+ 14.1.17. Aerial
+ 14.1.19. Rubber brushes of screen wipers
14.1.20. Jets of a stekloomyvatel
14.1.21. Washing nozzles of headlights
14.1.22. Screen wiper and its engine
14.1.23. Protect the car
14.1.24. Anticreeping "immunodeficiency"
14.1.25. Why headlights grow dull
+ 14.2. Electroschemes
Engines of Mercedes cars of the S-class work with the three-phase generator of an alternating current. Depending on model and equipment generators of various capacity are established.
The generator is put in action by means of a cranked shaft and a maple belt. Thus the rotor rotates approximately with the doubled frequency of rotation of a shaft of the engine by means of the winding of the excitement located in rigidly established winding of a stator.
By means of coal brushes and contact rings the current of excitement proceeds through an excitement winding. The electromagnetic field is thus formed. The provision of an electromagnetic field constantly changes in relation to a stator winding according to rotor rotation. Thanks to it in a winding of a stator the three-phase current is developed. But as the storage battery can be charged by only a direct current, the three-phase current will be transformed in constant by means of the rectifier established on a diode payment. The regulator of tension changes a charging current by means of inclusion and switching off of a current of excitement according to degree of a razryazhennost of the storage battery. At the same time the regulator supports to constants working tension about 12 Volts irrespective of frequency of rotation.
Safety measures at work on the generator of an alternating current
At work on the generator of an alternating current pay attention to points of data below instructions. Complete dismantling and repair of the generator of an alternating current carry out in a specialized repair truck.
If the additional storage battery is connected (for example, for simplification of start-up of the engine), surely pay attention to that identical poles of storage batteries among themselves incorporated.
At connection of the charger of a wire of the last connect to the corresponding plugs of the storage battery. During a charging disconnect from plugs of the storage battery a wire from a flexible partition between a body and the engine and a positive wire.
Do not allow to work to the engine without the storage battery.
Never close накоротко plugs on the generator of an alternating current and on a regulator.
Never make a perepolyusovka of the generator of an alternating current.
Check of a charge voltage of the generator
Replacement and check of coal brushes of a generator / regulator of tension
The regulator of tension is built in in the holder for coal brushes. It is possible to replace coal brushes separately, some skill for this purpose is, however, necessary; on the average they wear out after passing by the car about 120 000 km. We recommend to replace coal brushes slightly earlier.