The Fireye Nexus PPC4000 is a state of the art stand-alone parallel positioning system for all types of liquid or gaseous fuel fired combustion systems. When combined with a Fireye flame safeguard system such as the Fireye BurnerLogix control, the PPC4000 offers the most compact and advanced parallel positioning system available. Four fuel profiles allow the PPC4000 to accommodate a variety of applications such as two fuels, with and without the optional variable frequency/speed drive (VFD/VSD). With each profile having up to 24 points entered to assure a smooth "curve", the microprocessor interpolates points between entered values and precisely positions fuel and air to within 0.1 degree. This eliminates hysteresis for improved efficiency. The PPC4000 is capable of powering up to ten 24 volt DC servomotors powered from the control. All servomotors and displays operate on a secure Modbus communications protocol and can be "daisy chained" together for simplified wiring. Two independent PID control loops for temperature or pressure control provide precise, accurate control of firing rate for unmatched response to load changes. Ten safety rated user definable line voltage inputs are standard and can be configured for functions such as burner on, set-point select, lead lag, night setback, cold start thermal shock protection, etc. Built in lead lag sequencing for up to four boilers is included in every PPC4000.