ADJUSTMENT INSTRUCTIONS
It is advisable to check adjustments frequently at first, then regular periods of inspection may be established as conditions require. See General Inspection.
Due to operating conditions on the locomotive, it is not always practical to make adjustments to the regulator while installed on the locomotive. Consequently, in some instances, it will be necessary to remove the generator and control equipment to a test stand, or provide a small variable speed engine or motor to drive the generator.
When the equipment is adjusted in the locomotive, the units should be connected according to the diagram shown in Figure 3. If adjustments are made on a test bench, connections should be made as shown in Figure 4. For parallel connections (the use of two regulators and two generators) see Figure 5.
When the equipment is adjusted on the locomotive, care must be taken that the engine idling speed is adjusted to 550 RPM for the Cummins HBI engine, and 500 RPM for the HBIS engine. Due to the fact that the engines are governed at 1800 RPM, and different generator to engine speed ratios are used on the standard and supercharged engines, care must be taken to obtain the generator speed shown in the adjustment specifications.
Make temporary adjustments at first so that no damage will result. Then operate the units for 15 minutes or more to heat them up and make the final adjustments. Do not close the cutout relay contacts at any time by hand. If Generators and Regulators are connected in parallel, adjustments are to be made on one unit at a time. The opposite set must be at rest. Detailed adjustment instructions follow. Refer to Figure 3.
CUTOUT RELAY
First... Disconnect the battery wire from the terminal (B--).
Second... Set the contact gap (C7) at .070" to .075" by bending the armature stop (C5). (Set when contacts are open).
Third . . . Set the contact gap (C8) at .040" to .045" by bending the thin carrier (C6). ((Set when contacts are open).
Fourth... Loosen the two screws (C2) and move the bracket (C10) in order to set the hinge gap (C4) at approximately .005" to .015". (Set when contacts are closed).
Fifth... Set the gap (C9) between the armature and the core at .022" to .025"
by adjusting the hinge gap (C4). (Set when contacts are closed).
Sixth... The contacts at (C7) and (C8) should close when the voltage measured
across the terminal (G-- and G+) is from 28-29 volts. In addition to
closing at 28 to 29 volts both contacts must seal tightly, when the
generator Armature speed is between 700 and 750 R.P.M.
NOTE: Turn the adjusting nut (C3) clockwise to increase and counter-
clockwise to decrease the voltage until the proper adjustment is
reached.
Seventh . . .Connect one lead of the ammeter to the negative (--) battery wire and the other lead to the (B--) terminal. From a generator speed at which the contacts at (C7) and (C8) are closed, decrease the speed to a complete stop. The contacts should open when the discharge current in the line is from 0 to 10 amperes. If necessary, readjust the nut (C3) to obtain this value and recheck the contact closing voltage.
VOLTAGE REGULATOR
Eighth... Set the voltage regulator contact gap (R4) at .045" to .051" by holding the contact open and turning the screw (R3). (Set when contacts are open).
Ninth .. . . Set the gap (R6) between the armature and the core at .060" to .065". File the armature stop pin (R5) if necessary. (Set when contacts are open).
Tenth . . .Disconnect the battery from the terminal (B--).