SR 4 GENERATOR SYSTEMS OPERATION D  REGULATOR ADJUSTMENT GENERATOR VOLTAGE ADJUSTMENT CONTROLS 4.  Voltage droop control.  5.  Voltage level control. 6.  Regulator gain control. Adjustment  of  voltage  level  rheostat  (R2)  is  done  with voltage level control (5).  This is done when an increase or decrease of the generator voltage is necessary to get correct    line    voltage.        Adjustment    of    regulator    gain rheostat   (R3)   is   done   with   regulator   gain   control   (6). Adjustment  of  regulator  gain  rheostat  (R3)  and  voltage level  rheostat  (R2)  must  be  made  in  sequence  to  get exact  generator  voltage  regulation  when  the  engine  is equipped  with  either  a  mechanical  speed  droop  or  an isochronous  (0%  speed  droop)  governor.    Do  the  steps that follow: 1. Remove the access panel on the left side of the generator.    Loosen  the  locknuts  on  the  voltage adjustment  controls.    Turn  voltage  droop  control (4) fully counterclockwise. 2. Start   the   engine.      Increase   engine   speed   to nameplate rating. 3. Adjust voltage level control (5) to give nameplate rated    voltage.        Put    a    normal    load    on    the generator.  Let the generator warm up to normal temperature for operation. 4. Remove the load from the generator.  Adjust the voltage  level  control  if  necessary.   Put  a  normal load on the generator.  Check generator voltage. If     the     voltage     stays     at     nameplate     rating, regulator  gain  control  (6)  is  adjusted  correctly. Tighten all locknuts. 5. If   generator   VOLTAGE   INCREASES,   turn   the regulator gain control a small amount counterclockwise. If generator VOLTAGE DECREASES,  turn  the  regulator  gain  control  a small   amount   clockwise.      Remove   the   load. Adjust the voltage level control if necessary. 6. Put   a   normal   load   on   the   generator.      If   the voltage  does  not  stay  at  nameplate.    rating  see Step 5.  If it does, tighten all locknuts and install the access panel. NOTE Generator     sets     equipped     with     a control panel on top of the generator have the voltage level rheostat in the control  panel.    The  yellow  wire  from terminal 7 on the terminal strip of the regulator  assembly  is  disconnected. The   voltage   level   rheostat   on   the control   panel   is   then   connected   to terminals   6   and   7   on   the   terminal strip. The same sequence of adjustments must be made. In order to get an even distribution of reactive load and to  keep  circulating  currents  to  a  minimum  when  two  or more generators are operated in parallel.  it is necessary to    have    a    specific    decrease    in    voltage,    at    each generator,   with   an   increase   in   generator   load.      This decrease in voltage is the voltage droop.  Adjustment of voltage  droop  potentiometer  (R1)  is  done  with  voltage droop control (4).  Correction to the voltage droop can be made   by   turning   (R1)   from   counterclockwise   for   no voltage   droop   to   clockwise   for   an   increase   In   voltage droop.    Adjustment  of  voltage  droop  control  (4)  must  be in  sequence  with  voltage  level  control  (5)  and  regulator gain control (6).  See OPERATION GUIDE for engine. 42