Section  IV.  OPERATION  UNDER  USUAL  CONDITIONS 2-11.    General. 2-14.   Operation   of   Equipment. a.  Instructions  in  this  section  are  provided  for information   and   guidance   of   personnel   responsible for   operation   of   the   engine   generator   set. b.   The   operator   must   know   how   to   perform   every operation  of  which  the  engine  generator  set  is  capable. This   section   gives   instructions   on   starting   and   stop- ping   the   engine   generator   set,   operation   of   the   gener- ator  set  and  coordinating  the  basic  motions  to  perform the   specific   tasks   for   which   the   equipment   is   de- signed.  Since  nearly  every  job  presents  a  different problem,   the   operator   may   have   to   vary   procedures to  fit  the  individual  job. 2-12.    Starting. a.   Preparation   for   Starting.   Instructions   to   be followed   when   preparing   to   start   the   engine   genera- tor  set  are  shown  in  figure  2-6.  Preventive  main- tenance  procedures  to  be  performed  before  opera- tion  are  given  in  table  3-1. b.  Starting.  After  performing  the  preparation for  starting  procedure  of  paragraph  2-12a,  start  the engine   generator   set   as   shown   in   figure   2-7.   If   the engine  will  not  start  or  if  any  other  abnormality  is observed,   notify   organizational   maintenance personnel. 2-13.   Stopping. a.   Normal   Stopping.   (See   figure   2-8).   Preventive maintenance  procedures  to  be  performed  after  equip- ment  operation  are  given  in  table  3-1. b.   Stopping   by   Safety   Devices.   The   engine   gen- erator   set   is   equipped   with   safety   device   electrical circuits   that   will   automatically   stop   the   engine   and simultaneously   open   the   main   ac   contactor   in   case of;   (1)   high   coolant   temperature,   (2)   low   oil   pressure, (3)   engine   overspeed,   (4)   over-voltage   or,   (5)   no   fuel. A   short   circuit,   overload,   or   reverse   power   protec- tive   relay   will   automatically   open   the   main   ac   con- tactor   but   will   not   stop   the   engine.   On   precise   class 1   engine   generator   sets   only,   under   voltage   and   under frequency   relay   protective   circuits   will   similarly open  the  main  ac  contactor  but  will  also  not  stop  the engine. A  specific  FAULT  INDICATOR  (fig.  2-5) will  light  when  any  of  these  abnormal  conditions  occur. Refer   to   table   2-2   for   the   specific   criteria   for   which these   safety   device   electrical   circuits   operate.   Once the  engine  generator  set  has  been  stopped  due  to  the action  of  one  of  these  safety  devices,  the  problem must   be   corrected   before   the   engine   generator   set   is placed   back   in   operation. c. Emergency   Stopping.   To   stop   the   engine generator  set  in  an  emergency,  open  DC  CONTROL CIRCUIT  BREAKER  (fig.  2-8). a.  Single  Engine  Generator  Set  Operation. See-fig.   2-9   for   single   engine   generator   set   operating instructions. b.   Parallel   Operation   of   Engine   Generator   Sets, See-fig.  2-10  for  parallel  operation  instructions  for up  to  3  engine  generator  sets  of  the  same  class, mode  and  size. c.   Emergency   Operation.   If   any   emergency situation   requires   continued   operation   of   the   engine generator  set  after  being  shut  down  by  one  of  the safety   device   electrical   circuits   (para   2-13   b),  the BATTLE  SHORT  switch  (fig.  2-7)  can  be  used  to override   all   safety   devices   except   the   overspeed   and short   circuit   operation   of   this   switch   is   as   follows: (1)  Place  BATTLE  SHORT  switch  in  OFF position. (2)  Hold  START-RUN-STOP  switch  in  START POSITION  and  start  engine  (fig.  2-7). (3)  Lift  cover  and  push  BATTLE  SHORT switch  to  ON  position. (4)  Release  START  switch  and  push  BATTLE SHORT  switch  to  OFF  position  as  soon  as  possible after   emergency   has   passed. NOTE The   BATTLE   SHORT   switch may  be  actuated,  as  necessary, any   time   the   engine   generator set  is  operating. d. Load Connections for Parallel Op- eration. NOTE Prior to attempting parallel operation, ensure all generator sets have the same frequency and voltage output. WARNING Lethal voltages are present at the load terminal board of the generator set during operation. Do not attempt to connect or disconnect load leads while the generator set is operating. Do not attempt to connect or disconnect load leads with the generator set shut down and the load connected to another power 2-18   Change   12