Table  9-4.  Rotor  Winding  Data  (400  Hz) Resistance Connection Conductor Turns   per   coil No.  of  pole  and  coils 1.43  ohms  at  25°  C 1   ckt,   series,   see   schematic   diagram 4 of AWG #15 (0.0571) 30 24 (4) Rotor  dip  and  bake. (1)   Replace   or   rebuild   any   defective   parts. (a)  Preheat  wound  core  for  one  hour  in (2)  Apply  varnish  to  any  damaged  areas  of — forced  convection  oven  to  170°  C. (b)  Dip  hot  wound  core  in  varnish,  connec- tion  end  up,  for  three  minutes. (c)  Remove  wound  core  from  varnish  and drain,   connection   end   up,   for   four   minutes. (d)  Rotate  wound  core  so  connection  end  is down  and  drain  one  minute. (e)  Bake  wound  core  with  slots  in  horizon- tal  position  for  two  and  one-half  hours,  at  170°  C, in  forced  convection  oven. (f)  Repeat  paragraphs  (b)  through  (e)  above two  more  times  so  that  a  total  of  3  dips  and  bakes  is applied. (g)  The  varnished  wound  rotor  should  be examined   for   complete   coverage,   uniform   coverage with  no  strings  or  bends  and  with  openings  between extended  position  of  slot  tubes  free  of  varnish,  blis- tering   or   peeling,   and   complete   cure,   with   tack-free surface  and  good  bonding  strength. 9-5. a. insulation. b.  Rebuild. — (1)   Exciter   stator.   See   figure   9-7   and   table 9-5,   and   perform   the   procedures   provided   in   para- graph  9-4  (1)  and  (2). (2)   Exciter   rotor. Proceed  as  follows (a)  All  wound  cores  will  have  leads  con- nected  and  tied  on  the  inside  diameter  of  end  turns. (b)  All  connections  will  be  brazed  using brazing   alloy   per   MIL-S-15395   as   a   filler   material. End  connections  forming  pigtails  will  be  fusion welded  as  much  as  possible  with  addition  of  brazing alloy  per  above. Table  9-5.  Exciter  Stator  Winding  Data  (50/60  and  400  Hz) Type of winding No.  of  slots  and  coils No.  of  coils  per  group Turns   per   coil Span Conductor Resistance Connection 9-18 Change  4 (c)  All  connections  in  the  rotor  winding will   be   covered   with   sleeving   MIL-I-3190/3.   Tape should  be  1/2-inch  lapped  over  connections  and  ex- tended  3/8-  inch  beyond  connection. (d)  For  binding  end  turns  use  glass  roving. Exciter   Repair   and   Rebuild. (e)  The  rotor  end  turns  and  connections are  bound  and  laced  in  two  stages. Repair. Salient   pole,   dc 10   slots   10   coils 1 196 1  -  2 1 of AWG #21 (0. 0285) 1 of AWG #22 (0. 0253) 3.2  ohms  at  25°  C 2  circuit  (see  fig.  9-7)