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Sequence 2000 Controller

Sequence 2000 Controller
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Boiler Pressure transmitters Master header Pressure transmitter Total steam flow transmitter ( suitabl yp ositioned ) ( enhanced s y stem ) Steam heade r Sequence control panel LCD touch screen(H.M.I.) Communication links (enhanced system) Boiler automatic steam control valves (enhanced systems) Burner/boiler Control override >

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To prevent rapid cycling of boilers and therefore reduce energy wastage from purging and running fans, the Sequence 2000 control system maintains steam header pressure at the desired set point/s with the minimum of energy input by implementing the following field proven control philosophy: The system controls the available boilers (switched to Lead-Lag/Sequence control) to maintain the header pressure at the desired set point with a minimum of energy input. This is achieved by modulating the burners via 4-20 mA signals over their normal operating range. The overall system control is equally...

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Via touch screen control of the HMI (Human Machine Interface) the following control parameters can be accessed: The following further control parameters can be accessed: Automatic steam valve control > Real time clock to allow sequencer to start and stop the entire system. NB When in the timed-off mode top-up control remains enabled to keep boilers warm. Timed/pulsed ֑cracked, ґopen, and ґclose signals to control boiler steam valve automatically. NB Җ The lead boiler valve normally remains open. Flow control (feed forward) Timed on-off Accepts 4-20 mA signal from a steam flow transmitter to...

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Intuitive display structure allows access to all system variables and adjustment of configuration parameters via the touch screen. > CE Marked Enclosure Width 600 mm 600 mm 760 mm Size Height 600 mm 600 mm 760 mm Depth 350 mm 350 mm 300 mm Number of Boilers 2 2 to 6 2 to 6 Burner Types Modulating Modulating Modulating And/Or High/Low And/Or High/Low And/Or High/Low Human Machine Interface (H.M.I.) Touch Screen Touch Screen Touch Screen Control Voltage 110/230 V ac 110/230 V ac 110/230 V ac Timed On/Off Daily/Weekly Daily/Weekly Daily/Weekly Master Header Control PID PID PID Hand/Auto Header...

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