Product Overview | 8200 Controller
FUEL FLOW Up to two fuel inputs are available on the 8200. The system can use the fuel inputs one at a time or simultaneously. The 8200 can use one drive output to control all fuel flows or two fuel drive outputs, one for each. Discrete inputs are used to select which fuel input(s) are actively used in ratio calculations, allowing them to switch on or off at any time. Fuel totalizing is available. RATIO The ratio function is very flexible. The ratio calculations are based on heat flow allowing for any combination of oxidant and fuel flows. All flows are configured and displayed in engineering units and the ratio setpoint is expressed as percent excess air. Full anti-lean, anti-rich cross limiting prevents ratio excursions beyond configured limits. OXYGEN TRIM With the oxygen trim input the ratio can be automatically ad- justed to maintain a configured oxygen level. The oxygen trim input can be configured as a transmitter input or a controller input. When used as a transmitter input, the 8200 uses a PI controller to adjust the ratio. When used as a controller input, the 8200 uses the input directly as the ratio adjustment. The ratio adjustment is made by biasing the fuel heating values used in the calculations. A discrete input is used to select when the trim function is active. FURNACE PRESSURE The 8200 includes a furnace pressure control loop with a configurable transmitter input, alarm functions and loop tuning parameters. An analog output is available to be configured as the drive for this loop. REMOTE SETPOINT A 4-20 mA input is available as a remote setpoint which can be configured as a Process or Ratio setpoint. A discrete input is used to select local or remote setpoint operation. ANALOG OUTPUTS There are four analog outputs available on the 8200. Two are reserved as the Air1 and Fuel1 drive outputs. Two analog outputs are configurable and each can be used as a Furnace Pressure drive, Air2 drive, Fuel2 Drive, or retransmission of a selected variable.
LOGIC INPUTS Several logic inputs cause the 8200 to assume different operating states or to perform specific functions. — Purge commands the air loop(s) to the purge flow setpoints (disabled if configured for oxygen service) and the fuel loop(s) to their minimum positions. — Hold locks all control loops at their current outputs. — Excess air drives the air loop(s) to the maximum setpoint, resultling in fuel only control. — Low fire forces the process loop to its minimum output, resulting in the minimum firing rate with the flow control loops maintaining their setpoints. — Light off forces the control loops to their configured light off outputs. — Remote alarm reset allows the 8200 alarms to be reset by an external device. — O 2 Select enable/disables the O 2 trim function. EVENT OUTPUTS Four Event outputs are available on the 8200. These output contacts respond based on the specific event configuration. The outputs can be 5 to 30 VDC or 5 to 120 VAC depending on the system wiring. ALARM OUTPUTS The 8200 provides three discrete outputs to report system status and alarms. The System Ready output will only be energized when the processor is running normally and all required analog inputs are in range. The No Alarm output is energized when no alarms are present. The Alarm output is energized when any alarm is annunciated. Any detected alarm is annunciated with a diagnostic message on the display . COMMUNICATIONS — The 8200 controllers use Profinet for network communications.
— Built-in Modbus TCP/IP is also available for information commmonly accessed through communications.
Bulletin 8200 Page 3
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