COVER 6N7016 - Caterpillar

Illustration 1 g01630978
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.The resistance measurements should be taken when the temperature of the generator is the same as room ambient. Each connectionfor the monitoring or control devices, and for each winding must be separated in order to measure the resistance. The armature windings have very little resistance. The resistance of these windings will measure near 0 ohms. Use a milliohmmeter to measure the resistance of the armature windings.
Table 1
Winding Resistances    
    1000 Frame     2000 Frame     3000 Frame    
Main Field (Rotor)     3.1 to 6.7 ohms     1.3 to 3.3 ohms     1.3 to 3.3 ohms    
Main armature (Stator)     0.16 to 0.7 ohms
    0.02 to 0.16 ohms     0.02 to 0.16 ohms    
Exciter Armature (Rotor)     approx. 0.79 ohms     approx. 0.23 ohms     approx. 0.23 ohms    
Exciter Field (Stator)     4.6 to 23.5 ohms (1)     4.6 to 23.5 ohms (1)     4.6 to 23.5 ohms (1)    
Auxiliary windings     less than 0.5 ohm     less than 0.5 ohm     less than 0.5 ohm    
( 1 ) Consult TMI.Note: There should be no continuity between any winding and ground. There should be no continuity between any winding and another winding.