OM-2226 / Operation and Maintenance Manual
60CU20 / Series 500062 / 400 Hz. Generator Set
May 2, 2013
Chapter 2-3
Page 15
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
Resistance (Ohms)
Generator Stator Phase A to N (G1)*
0.0026
Generator Stator Phase B to N (G1)*
0.0026
Generator Stator Phase C to N (G1)*
0.0026
Exciter Stator Field (L2)
29
A - B, B - C, C - A Exciter Armature (G2)
0.041
Generator Revolving Field (L1)
2.1
*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.).
Figure 8: Generator and Exciter Test Readings
Figure 9: Generator Connections
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