BigReactors Turbine RPM Control

local turbine
local rotorspeed
local maxrotorspeed = 1820
local minrotorspeed = 1780
local turbineactive
local turbinemanip

while true do
  turbine= peripheral.wrap("back")
  rotorspeed= turbine.getRotorSpeed()
  write (rotorspeed)
  turbineactive= turbine.getActive()

  if rotorspeed > maxrotorspeed then
    write ("Turbine above max speed. Shutting down")
    turbine.setActive(false)
    turbinemanip= true

      elseif rotorspeed < minrotorspeed then
        write ("Turbine below max speed. Starting up.")
        turbine.setActive(true)

        elseif turbinemanip == true then
            write ("RPM acceptable levels. Turning back on.")
  end
  sleep(5)
end