Table 2-2. Generator Set Troubleshooting (Cont) Malfunction Probable  cause Corrective action 27. Generator runs at 130 a. Defective overload a. Replace  K14  (para  8-6 — percent  or  more relay (K14). and 8-7). rated current for longer than 10 minutes, b. Defective re- b. Replace resistor R23, R24 or CB2 does not open and sisters  R23,  R24 R25, if ohmmeter test indi- overload  indicator  does or R25. cates defect (fig. 8-2 and 8-3). not light. c. Defective   current c. Replace   defective   current’ transformer  CT1, transformer  CT1,  CT2  or CT2 or CT3. CT3  (para  6-7  thru  6-8). 28. Generator runs at Defective overvoltage Replace overvoltage relay (para 8-6 overvoltage  (130 relay  K2. and 8-7). percent.    Set does not shut down and overvoltage  indi- cator  does  not  light. 29. Generator runs Defective undervoltage Replace undervoltage relay K11 under voltage (85 percent relay  Kil_o (para 8-6 and 8-7). of rated voltage or less). CB2 does not open and undervoltage   indicator does not light (Class  I  only) 30. Percent power meter Reverse power relay Measure  dc  voltage  at  K15  terminals reads down scale with (K15)   defective. 3 and 4. It should be 24 volts 2 or more sets paral- (positive on terminal 3). Check leled. for Vdc at pins 1 and 2. If 2 or more Vdc are present with 1 positive replace reverse power relay (para 8-6 and 8-7). 31. Set starts but will not a. System  fault  as a. Correct indicated fault. — run  unless  protection indicated by bypass  switch  (S7) fault  indicator is  closed. panel. b. If no lamp is il- b. Replace any defective lamps. luminated,  press fault  indicator test  switch  to ensure  that  all lamps  are  working. NOTE If the corrective action in a and b above does not correct the malfunction, proceed to determine if one of the fol- lowing components are defective by placing jumpers across their contacts as follows: c. Overvoltage c. Terminals 3 and 4 of K2. relay  K2. d. Low oil pressure d. Terminal 3 of K2 and 4 of AS. switch OP and high coolant  temperature switch WT. Change 5 2-17