TM5-61 15-593-34 NAVFAC P-8-631-34 TO-35C2-3-463-2 CHAPTER 5 MAINTENANCE OF CONTROL CUBICLE 5-1.    GENERAL.    The  control  cubicle  is  located  at  the rear  (generator  end)  of  the  generator  set.    It  contains two  control  panels,  the  engine  control  panel,  and  the generator  control  panel.    These  instruments,  and  other equipment  necessary  to  start,  operate,  and  monitor  the generator  set.    The  control  cubicle  is  removable  from the generator set as a single unit. WARNING BEFORE STARTING ANY MAINTENANCE PROCEDURE, SET MAINTENANCE LOCKOUT SWITCH TO LOCKOUT.    DISCONNECT  NEGATIVE CABLE   FROM   BATTERIES.   REMOVE EXTERNAL POWER BY OPENING CB101   (EXTERNAL   POWER   CIRCUIT BREAKER) AND DISCONNECTING POWER  CABLE  FROM  RECEPTACLE J101 (120V RECEPTACLE). 5-2.          TRANSDUCERS     A103,     A107,     AND     A108. Transducer  A103  is  mounted  on  the  rear  panel  of  the control   cubicle   enclosure   (31,   figure   5-1,   sheet   1). Transducers  A107  and  A108  (thermal  watt  converters, 82, figure 5-1, sheet 2) are mounted at the base of the control cubicle. a. Testing. (1) Remove  transducers  A107  and  A108 according to paragraph 5-2 b and test as follows: WARNING HIGH VOLTAGES PRESENT DURING TEST. DEATH OR SEVERE BURNS MAY RESULT IF PERSONNEL FAIL PRECAUTIONS (a) Connect transducer (either A107    or    A108)    as    shown    in figure 5-2, using test equipment as shown. (b) Adjust  T1,  T2,  and  T3  to  their minimum position, fully counter- clockwise. (c) Close S1 and open S2 and S3. (d) Energize 120/208V AC. 3- phase,   4   wire,   60   Hz   power source. (e) Adjust   T1   until   0.7   ampere   is indicated  on  ammeter  A1.    At this    point,    the    percentage    of RATING  METER  shall  indicate 33 percent. (f) With   S1   closed,   close   switch S2,    and    adjust    T2    until    0.7 ampere is indicated on ammeter  A2.    The  percentage of RATING METER shall indicate 66 percent. (g) With  S1  and  S2  closed,  close S3.  Adjust T3 until 0.7 ampere is    indicated    on    ammeter    A3. The     percentage     of     RATING METER shall indicate 100 percent. (h) If requirements of steps (e), (f), and (g) are not met, replace the transducers. (2) Transducers   A103.      This   transducer and   generator   set   frequency   meter are    a    matched    set,    and    must    be tested    as    a    set.        Refer    to    the Operator/Crew and Organizational level Maintenance manual and remove    frequency    meter    from    the generator panel of the control cubicle. (a) Connect  a  test  setup  as  shown in figure 5-3. (b) Vary  the  frequency  from  lowest scale reading to full scale reading    at    120    volts    and    at frequencies  between  48  and  53 Hz,    the    generator    set    meter shall   read   within   1   percent   of the generated frequency (to the left); at 120 volts and at frequencies 5-1