4-42 Change 10 TM    5-6115-585-12 NAVFAC    P-8-623-12 TO-35C2-3-455-1 T M - 0 5 6 8 4 C / 0 5 6 8 5 B - 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   Cubicle.   Perform   operational   test   on control  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   fre- quency,  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   Rheostat   (R1).   Turn   the Ammeter  Voltmeter  transfer  switch  to  its  various  positions. For  each  position  of  the  switch,  turn  voltage  adjust  rheostat to   its   extreme   positions.   Voltage   reading   should   be   as   fol- lows.  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  terminals  of  panel  light  (panel  light  switch  ON), check  that  lamps  do  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   (M1).   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  volt  meter tolerance. (7)   DC   Control   Circuit   Breaker   (CB2).   Operate Generator  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  ohm- meter,  check  for  continuity  between  terminals  for  each  of  the five  switch  positions  as  given  in  table  4-3.  If  the  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  continuity.  With  the switch   in   the   ON   position,   there   should   be   continuity. Replace  switch  if  necessary. Table  4-3.  Master  Switch  Continuity  Check Switch   Position PREHEAT OFF RUN  AUX  FUEL RUN START Check   for   Continuity Between   Terminals 11-15 NONE 11-13-17 11-13 11-13-15    25-27-28