OM-2226 / Operation and Maintenance Manual
60CU20 / Series 500062 / 400 Hz. Generator Set
May 2, 2013
Revision 2
Chapter 2-4
Page 14
Load Contactor Operating Circuits
Output 1: Contactor K1, Pushbutton switch S75
Output 2: Contactor K201, Pushbutton switch S275
Trouble, Symptom, Condition
Probable Cause
Test, Check, and/or Remedy
1.
Load contactor will not close
when the corresponding
Output
pushbutton switch is
held in closed position.
Generator is running at normal
voltage.
a.
Blown contactor fuse (F3) on
regulator board
Check the fuse and replace if
blown. If it blows again, check the
contactor.
b.
Defective
Output
pushbutton
switch
At rated speed, measure the
voltage across the switch. The
voltage should read approximately
5 VDC when the switch is open
and 0 V when the switch is closed.
If voltage does not go to 0 V, the
switch is defective and needs to be
replaced.
c.
Defective Voltage Regulator
(REG) board
Measure the DC output voltage at
contactor coil. If the voltage
measured isn’t approximately 90
VDC, replace REG.
Replace the REG board.
d.
Defective coil in load contactor
Disconnect leads at load contactor
terminals V and W. Check coil
resistance between these
terminals. Resistance should be
approximately 600 ohms. If coil is
defective, replace the contactor.
Summary of Contents for 500062-DLX
Page 2: ......
Page 4: ......
Page 6: ......
Page 209: ......
Page 210: ......
Page 211: ......
Page 212: ......
Page 213: ......
Page 214: ......
Page 215: ......
Page 216: ......
Page 217: ......
Page 218: ......
Page 219: ......
Page 220: ......
Page 221: ......
Page 222: ......
Page 223: ......
Page 224: ......
Page 225: ......
Page 226: ......
Page 227: ......
Page 228: ......
Page 229: ......
Page 230: ......
Page 231: ......
Page 232: ......
Page 233: ......
Page 234: ......
Page 235: ......
Page 236: ......
Page 237: ......
Page 238: ......
Page 239: ......
Page 240: ......
Page 241: ......
Page 242: ......