TYPE 2022-G or 2023-G GENERATOR
Characteristics
The generator, rated at 20 to 21 amperes, 32 to 40 volts at 900 R.P.M., is a direct current, four-brush, shunt-wound engine-driven unit. Looking at the driven end, the units are connected internally for clockwise rotation for the type 2022-G generator, and counterclockwise for the Type 2023-G, see Fig. 1. It is connected to a type 1800-R16 Leece-Neville voltage control unit.
This generator is used for charging a 16 cell, lead acid type battery and provides current for lighting and control equipment. For internal wiring diagram for generator 2022-G or 2023-G, see Figure 1. For operation of generators in parallel see Locomotive Connection Diagram, Figure 5.
Inspection
Apparatus should be inspected often enough to prevent failure in service. This should include:
1. CLEANING
It is essential that the apparatus be kept clean at all times. At least once a month, blow dirt or brush-dust out of the commutator-end housing 10, and brush rigging 11, Figure 1, with dry compressed air.
2. COMMUTATOR
Inspect for roughness or eccentricity. If using No. 00 sandpaper does not correct this, or if the mica does or is about to project above the copper segment surface, the commutator must be resurfaced as described under COMMUTATOR MAINTENANCE.
3. BRUSHES AND BRUSH HOLDERS
Check periodically for wear, proper spring pressure and that brushes are free in the brush holders. When brushes are worn down to 11/16 inch lengths, it is advisable to use the second notch of the levers. Refer to MAINTENANCE SECTION, REASSEMBLY, for spring pressures. Also check for loose, shorted or grounded connections.
4. LUBRICATION
Lubricate generator bearings 3 and 34, Figure 1, with a light machine oil. Do not lubricate excessively as oil may enter the generator and cause failures.
Commutator Maintenance
If the commutator is rough, burned or eccentric, it must be resurfaced in a lathe. Turn off only enough copper to leave a uniformly true surface. The minimum diameter to which the commutator can be turned is 2-19/32 inches. The new diameter is 2 3/4 inches. Do not turn off any copper from the commutator risers 42, Figure 1. After the commutator is turned, carefully undercut the mica insulation between the copper segments to a depth of 0.030 inches. The sharp edges of the bars should be removed with a hand scraper or knife. Smooth and polish the commutator surface with fine sandpaper. Test armature for short circuits.
Next page