Cummins Onan UR — Generator Disassembly ..............................................................

For the Cummins Onan UR.

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Procedure

1. 1 . \ .. ~ B A L n , I I I I - ~~ ~ j ~ - * -
2. 1. Demand for power starts the engine, thereby turning
3. 2. Residual magnetism in the rotor's main field, indu- -
4. 3. Single-phase AC voltage is taken from the main
5. 4. The voltage regulator compares the input with the
6. 5. The exciter stator field inducesvoltage in the exciter
7. 6. Three-phase AC voltage is tapped from the exciter
8. 7. DC voltage from the rotating rectifiers is fed to the
9. 8. The main field continues to build until rated (or -- I r ' I Y kW S2 S2 -1 ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON s3 '
10. 1. Check all modifications, repairs, and replacements
11. 2. Visually inspect the components of Voltage Regula- I
12. 3. Visually inspect the exciter rotor assembly for I I ~ , I I I , I I I -5 I - c I A - ~- I , I T I No I I t - I I No I I I + - I I I I I I I I I I I I - NO - ~ No t , c i I I ‘I I + I I J

Source: manual:Stamford UR Alternator Service Manual.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.