SPECIFICATION

Standard Features Enhanced Features

Via touch screen control of the INDUSTRIAL HMI (Industrial human machine interface) the following control parameters can be accessed: The following further control parameters can be accessed: Automatic steam valve control

Engineer and Operator Access

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’, ‘open’, and ‘close’ signals to control boiler steam valve automatically. NB – 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 modify the modulation signal and adjust sequence control accordingly. Control override Communications Enables next available boiler to be called in immediately when informed of significant load increase. Allow parameters from the sequencer to be read remotely and some parameters to be changed over a remote link. Provide signals for integration with boilerhouse System Manager and control system. Two control set points Can enable periods of operation at ‘normal’ or ‘set-back’ master pressure set points. Adjustable priority map Selection of lead and standby boiler sequence. Alarms Burner mode alarm and steam high/low alarms. Manual override Manual control of modulating industrial burners.

Benefits

Automatically sequences and selects a number of boilers operating to match overall steam demand, thus avoiding wasteful firing of excessive boilers. Fires boiler/s at optimum outputs at most efficient rates. Third start/stop of boilers according to production steam requirements. Pressure set-back control to avoid unnecessary high pressure steam when lower pressure is acceptable. Saves fuel

Engineer Only Access

Master header pressure Pid control of steam pressure signal. Saves energy All the above operating conditions assist in reducing electrical running costs, particularly by avoiding multiple firing of boilers at low outputs. I Call in/out set points/delays Variable setting of the firing rate points at which burner is called to start/stop. Variable setting of call in/out responses. mproves production Up-freeze/down-freeze delays PID control of steam pressure ensures accurate and responsive steam pressure control to the production process. These settings ensure a boiler brought online has an effect on the system before another is called in. Boiler top-up control Maintains standby boiler/s available to sequence at a standby pressure. (Standby and lower priority pressure settings can be selected). Increases production security Sequence control with priority map enables the system to compensate for on-line failures to provide the most consistent and reliable supply of steam for the production process. Limit cut-back Additional steam pressure setting to prevent steam pressure limit cut out of boilers. Saves maintenance/service costs Integrated with Hamworthy Combustion burners and control panels for common service and planned maintenance. Lead shut-off Enables reduced steam pressure and/or timed delay of restart of lead boiler (at periods of very low demand).