Plant Wide Controller
Benefits:
- State-of-the-Art Sequencing, Monitoring and Control
- Easy to Use
- Low Cost
- Efficient Boiler Plant Control Content
State-of-the-Art Sequencing, Monitoring and Control
- Combines innovative ease of operation, communication and expansion capabilities with boiler plant control application expertise
- Expandability for additional monitoring or control for pumps, variable speed drives, and valves
- Multiple communication protocols allow simultaneous communication to alphanumeric pagers or laptop via standard telephone lines and BAS or SCADA systems using a control network
- The PWC is a complete plant monitoring, control and communication interface
Easy to Use
- Easy to Install – The PWC integrates a powerful Programmable Function Controller (PFC), I/O boards, hardwired and LCD HMI, power distribution, 24 Vdc power supplies, external communications, isolation relays into a single wall mountable controller.
- Easy to Operate – Large LCD display, intuitive operation, setup, alarm/event summary and historical trend displays allow quick process assessment and maintenance monitoring
- Easy to Configure – PWC uses an intuitive “Blockware” configuration language with multiple block outputs and special purpose “Super” blocks that greatly simplify complex logic such as Outdoor Air Reset and boiler sequencing
Low Cost
- Self contained
- Wall mount enclosure with fusing and power supply
- Built In
- Chart Recorder
- Hardwired individual boiler controls
- Boiler on-off-auto control
- Firing rate control
- Firing rate auto/manual
- Communications
- Low cost thermistor temperature monitoring
Efficient Boiler Plant Control
- Accurate sequencing reduces fuel expense by eliminating unnecessary boiler on-off cycling
- Outdoor reset saves energy
- Time, day, week, setback save energy
- Variable speed fan and pump controls
- Plant wide efficiency monitoring
- Fuel budget, fuel consumption tracking
- Enables degree day reports
- Accurate PID control
The LCD Graphic Display brings plant overviews, historical trending, alarm and event status, and setup displays right to the plant floor.
Plant Overview Display |
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Historical Trend Display |
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Alarm Display |
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Setback Display |
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Easy to Operate
Hardwired control switches and indications:
A - Status indications B - Boiler On-Off-Auto C - 0 - 100% Bargraph |
D - Firing Rate Auto/Manual E - Firing Rate Control Dial |
Display Keys
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Boiler Modulating Lead/Lag Applications
- Full Boiler Modulation - Multiple boiler firing rates are automatically adjusted to satisfy the overall plant hot water or steam demand. Either unison (parallel) or series modulation is used.
- Improved Steam or Hot Water System Availability Automatic Sequencing ensures that the number of boilers in service meets hot water or steam demand. Tripped equipment is automatically replaced with a standby unit.
- Boiler Monitoring - Flue gas temperature, smoke opacity and boiler draft may be monitored and trended. Warning alarms and burner safety shutdown interlocks may be included.
- Unmanned Boiler Plants - Provides for off-site monitoring and control using internal modem or RS485 interface. Serves as a single plant monitoring point for Building Automation Systems and personal alphanumeric pagers.
Extensive Plant Wide Control Applications
- Cooling Tower Optimization – Multiple Tower Cells are sequenced and fan speed controlled with wet bulb optimization. Substantial fan and chiller electrical savings can be realized.
- Improved E-Gen Fuel System Availability – Fuel pump standby sequencing, day tank level control and fuel storage tank level and leak monitoring.
- Improved Steam System Availability – Condensate transfer and feed pump standby sequencing, Deaerator and Surge tank level monitoring, alarm and remote communications.
- Coordinated Hot Water System Operation – Pumps, isolation valves, distribution pumps and temperature monitoring for reduced thermal stress and energy consumption.
- Fresh Air Dampers, Air Compressors and Fans Sequencing, monitoring, and control are based on the number of boilers online. A single damper failure will not prevent a boiler from firing.
Internally mounted Telephone Modem and Remote Communication
- Permits PWC to “Dial Out” to an alphanumeric pager for alarms display
- Upon receipt of the page, the user can “dial-in” to the modem to acknowledge the message
- Every page and acknowledgment in the Alarm/Event list will have time and date stamp
- Allows Operator to view all displays and make tuning adjustments from a remote site by using the PWC_Remote Software
- With PWC_Remote running, users can “dial in” to any PWC site, and does not require site specific programs or custom configurations
Control Network
- Built in RS485 Modbus
- Building Automation System (BAS), Building Management System (BMS), or SCADA interface
- A single collection point for plant monitoring
Historical Trend Chart can display up to 4 traces called ‘Pens’, with the symbol and name of each Pen displayed on the bottom of the screen. The PWC can save up to 32 analog values plus up to 32 discrete values every 1, 5, 15, or 60 seconds in the 32 Mb non-volatile memory. The 32 Mb Historical Memory can store up to 106 months of data.
Pen Selection
- Each “Pen” trace has a unique name, chart scale and engineering units
- Only one Pen Scale can be displayed at a time
- The Up and Down Cursor Arrows may be used to display the desired Pen Scale
Chart Cursor Readout
- Numeric keypad Arrows enable the operator to move the Chart Cursor
- The number on the top line of the screen is the value of the currently selected Pen trace where it touches the Chart Cursor
- Use the Cursor Up and Down Arrows to display the values for the other Pens
Start Time Panning
- The time is shifted 7/8 of the span to provide chart display overlap
- Use the Cursor Left and Right Arrows to shift the Start Time backward or forward in time
Changing Chart Span
- Using the PAGE UP and PAGE DOWN keys, the operator may change the Chart Span between 8 min, 40 min, 2 hours, 8 hours, or 24 hours.
'Span', Start Time and Date Selection
- When a Chart is selected, the first screen that appears is the “Setup Display.”
- Setup Display allows the operator to easily select “Span” (width), Start Time and Date
Plant Wide Controller (PWC) configurations are designed to allow commissioning to be accomplished from the controller mounted displays. Project specific tuning displays may be created to present and group key “Blockware” parameters for field tuning. Additionally, any block parameter may be edited from the front panel display using the “Parameter Edit” mode. Laptop computer software such as PWC_Edit and PWC_Draw are only required when it is necessary to change wiring between blocks or add additional blocks.
PWC_Edit™
- The “point and click” simplicity of the PWC_Edit software makes “Blockware” configuration simple and intuitive.
- It uses straightforward spreadsheet format with a convenient fill-in-the-blanks approach.
- The “Blockware” data and comments can be printed to any MS Windows® compatible printer
- Dynamic-text, soft-buttons, status, numeric values, time values and alarms may be added to any display
- The generated configurations are easily downloaded using a standard RS232 DB9F cable
PWC_Draw™
- The powerful object-oriented CAD interface in PWC_Draw makes the program the ideal choice for rapid “Blockware” programming in a visual environment
- The program is built on a Visio® platform
- Functions are simple dragged onto the drawing page and connected with “Smart Connector” lines to interconnect the Blocks
- Block inputs are automatically generated by placing the Block Connections
- Drawings can be saved as AutoCAD® drawings and can be printed on any MS Windows® compatible printer or plotter
