Generator And Exciter Test - Hobart 60CU20 Operation And Maintenance Manual With Illustrated Parts List

OM-2226 / Operation and Maintenance Manual
60CU20 / Series 500062 / 400 Hz. Generator Set
d) Engine Accessories Adjustment
Alternator and fan belt adjustment: Refer to Section 2-1 and engine manufacturer manual.

4) Generator and Exciter Test

The generator fields and exciter stator may be tested with a Kelvin bridge. This is a double-bridge type
instrument required for the very low resistance's encountered in this test. It is understood that zero (0)
resistance indicates a SHORT CIRCUITED condition. An infinite resistance reading indicates an OPEN
CIRCUITED condition.
a) Disconnect generator stator leads at the output module panel.
b) Disconnect the two black exciter field leads from terminal block mounted on output module panel.
c) Check resistance and compare to values.
Test Connection
Generator Stator Phase A to N (G1)*
Generator Stator Phase B to N (G1)*
Generator Stator Phase C to N (G1)*
Exciter Stator Field (L2)
A - B, B - C, C - A Exciter Armature (G2)
Generator Revolving Field (L1)
*NOTE: The two leads of a phase must be connected when test is made. Take
readings when unit is cold and in an ambient temperature of 70 ºF (21ºC.).
May 2, 2013
Figure 8: Generator and Exciter Test Readings
Figure 9: Generator Connections
Resistance (Ohms)
0.0026
0.0026
0.0026
29
0.041
2.1
Chapter 2-3
Page 15