TM   5-6115-584-12 NAVFAC   P-8-622-12 TO-35C2-3-456-1 TM-05682C-12 4-38.  CONTROL  CUBICLE  ASSEMBLY. a. Test, On Equipment (see figure 4-33). NOTE When disconnecting leads from terminals, tape leads  to  prevent  electrical  shorts. (1) Control Cubical. Perform operational test on con- trol  cubicle,  checking  for  proper  operation  in  each  of  the Generator  Set’s  three  modes  using  a  voltmeter  of  known accuracy. Check that ac output voltage indicated on control panel matches output voltage at terminal board. Check that Generator Set does come to an EMERGENCY STOP when dc control circuit breaker (figure 2-3) is pulled. Test individ- ual components of the control cubicle as given below. See figure 4-33 for location of components. (2) With the generator operating at rated speed or 60 Hz, flash the generator field by placing the master switch on the  control  cubicle  in  the  start  position.  If  the  generator voltage fails to build up after flashing, the control cubicle may be defective. (3) Voltage Adjust Reheostat (R1). Turn the Amme- ter  Voltmeter  transfer  switch  to  its  various  positions.  For each position of the switch, turn voltage adjust reheostat to its extreme positions, Voltage readings should be as follows. Voltage adjust range shall be between 205 and 220V for the 120/208V,  3  phase,  4  wire  connection.  Between  114  and 126V for the 120V, 1 phase, 2 wire connection. Between 228 and 252V for the 120/240V, 1 phase, 3 wire connection. (4) Panel Light Assemblies (DS1) and (DS2). With a good incandescent lamp in place and 24 vdc present at ter- minals  of  panel  light  (panel  light  switch  ON)  check  that lamps do not light. NOTE Be  certain  panel  light  switch  is  OFF  before installing or replacing panel light assembly. (5) Hour Meter (M2). Operate Generator Set. Check hour meter against a known accurate time source. Replace meter if necessary. (6)  Battery  Charging  Indicator  (MI),  Connect  meter capable  of  reading  at  least  35  volts  DC  from  terminal  on battery  charging  indicator  to  ground.  Operate  Generator Set. With the needle in the yellow area, the meter should read between 18 and 27.5 volts. With the needle in the green area, the meter should read between 24.5 and 31.5 volts. NOTE: The apparent overlap in voltage between the yellow high and green  low  is  the  result  of  a  plus  or  minus  1.5  voltmeter tolerance. (7) DC Control Circuit Breaker (CB2). Operate Gen- erator   Set.   Pull   circuit   breaker   (CB2).   If   generator   does   not come to an emergency stop, stop the unit using master switch and  replace  breaker. CAUTION Disconnect battery cable before making checks, unless  otherwise  noted. (8) Master Switch (S1). Disconnect battery. Tag and disconnect seven leads to master switch. Using an ohmme- ter, check for continuity between terminals for each of the five switch positions as given in table 4-3. If continuity is not found for each set of terminals listed, replace master switch. (9) Panel Light Switch (S2). Tag and disconnect two leads  to  panel  light  switch.  Using  an  ohmmeter,  test  for continuity between terminals on switch. With the switch in the OFF position, there should be no Table  4-3  Master  Switch  Continuity  Check Check  for  Continuity Switch  Position Between   Terminals I PREHEAT I 11-15 OFF NONE I RUN AUX FUEL 11-13-17 RUN 11-13 START 11-13-15  25-27-38 4-42 Change 9