DIESEL ENGINE BASIC 8S9686 - Caterpillar

Illustration 1 g00935208
PMPE Generator Wiring Diagram for 2400, 2500, 2800, and 2900 frames (CR1-C6) Diodes (C7) Varistor (L1) Exciter field (stator) (L2) Exciter armature (rotor) (L3) Main field (rotor) (L4) Main armature (stator) (L5) Pilot exciter armature (PM) Permanent magnet (RFA) Rotating field assembly (CST) Customer supplied transformer
Illustration 2 g00935204
PMPE Generator Wiring Diagram for 2600 frames (CR1-C6) Diodes (C7) Varistor (L1) Exciter field (stator) (L2) Exciter armature (rotor) (L3) Main field (rotor) (L4) Main armature (stator) (L5) Pilot exciter armature (PM) Permanent magnet (RFA) Rotating field assembly (CST) Customer supplied transformer
Table 1
Tools Needed    
Part Number     Part     Quantity    
6V-7070     Digital Multimeter     1    
9U-7330     Multimeter     1    
146-4080     Digital Multimeter (RS232)     1    
7X-1710     Multimeter Probe Group     1    Measure the resistance of the following windings: (L1), (L2), (L3), (L4) and (L5). The winding that is being tested must be disconnected from the other components before the resistance can be measured. The following resistance measurements are approximations. If the measured value is not near the listed approximation, the winding is probably damaged. For a more precise resistance value, consult the Technical Marketing Information (TMI). Refer to the generator arrangement that is in question.Note: The winding temperature affects the resistance. When the winding temperature increases, the winding resistance also increases. When the winding temperature decreases, the winding resistance also decreases. Therefore, a correct measurement can be performed only when the winding is at room temperature.The following armature windings have very little resistance: (L2), (L4) and (L5). The resistance of these windings will measure near 0 ohms. Use a milliohmmeter to measure the resistance of the armature windings.Exciter Armature Rotor (L2) - less than 0.1 ohmMain armature Stator (L4) - less than 0.1 ohmPilot Exciter Armature (L5) - less than 0.1 ohmUse a multimeter in order to measure the resistance of field windings (L1) and (L3) .Exciter Field (Stator) (L1) - approximately 3.0 ohms to 6.0 ohmsMain Field (Rotor) (L3) - approximately 0.75 ohms to 2.0 ohmsNote: There should be no continuity between any winding and ground. There should be no continuity between any winding and another winding.