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Chief Dispatcher Boiler Plant Master Control System

Application | Overview | Features

The Chief Dispatcher boiler plant master provides lead lag control for up to ten boilers. It monitors a common steam header pressure or hot water temperature transmitter and provides on off, and modulating control of burner firing rate.

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Chief Dispatcher
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Chief Dispatcher

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The Chief Dispatcher plant master optimizes boiler plant performance and helps extend boiler life for Cast Iron Sectional, Finned-Tube, Firebox, Flexible Tube or Firetube boilers . It can be applied to steam plants, hot water plants, and to hot water plants with condensing hot water boilers.

The Chief Dispatcher brings on the optimum number of boilers to meet plant demand, and optimizes the firing rate of each boiler to minimize fuel consumption.

 It communicates with the building or facility via Modbus, Ethernet (with converter) and can dial an alphanumeric pager.

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  • Overview
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The Chief Dispatcher is an advanced boiler sequencing, communication and monitoring system. The Chief Dispatcher combines innovative ease of operation, communication and expansion capabilities with boiler application expertise. Off-the-shelf, standard modulating lead/lag applications can be expanded to control circulating water variable speed pumps and isolation valves while monitoring the flame safeguard and boiler control systems. Multiple communication protocols allow simultaneous communication to alphanumeric pagers and the Building Automation System or local devices.

“Smart” Boiler Sequencing: Boilers are automatically sequenced on/off to ensure that the number of boilers in service meets hot water demand. If any boiler fails to start when called, or if a boiler trips during operation, the Chief Dispatcher immediately starts another boiler to replace the “Faulted” boiler. The operator may manually select the Lead boiler or allow the Lead Boiler to rotate automatically. Additionally, the total number of boilers in service may be set automatically or manually as selected by the operator or all boilers may be shutdown by a Building Automation System “Enable/Disable” contact input.

“Hard Manual” Backup: Hard wired control switches and dials provide simple manual control for easy troubleshooting and service. Each boiler has an individual firing rate bargraph, “Manual” firing rate output knob, and “Auto/Manual’ switch. 

Modbus Communication Interface: A factory configured RS485 Modbus interface is available for Building Automation or SCADA system monitoring and control.

Building Automation System: A remote Hot Water Supply (HWS) temperature setpoint is set by either a Modbus or 4-20 mADC Building Automation System (BAS) Outdoor Reset input signal.

Firing Rate Output: Boiler Firing Rate Analog Output Cards may be ordered as ‘-P’ = 0-135 ohm or ‘-I’ = 4-20 mADC.

Telephone Modem: The internally mounted Telephone Modem permits the Chief Dispatcher to dial out to an alphanumeric pager and allows a user to dial in to the Chief Dispatcher to view all displays and make tuning adjustments. Selected alarms cause the modem to dial a pager service center telephone number.  A 20-digit phone number can include outside line codes, access codes, and pauses. The message can include a 30-character facility name plus a 20-character alarm message. Upon receipt of the page, the user can “dial in” to the modem to acknowledge the message. Using PWC_Remote™ software, which is included with the Telephone Modem, a remote user is able to “dial in” to the modem and view any screen and remotely “press” any keypad button just as if they were standing in front of the controller. PWC_Remote™ software running on the user’s personal computer can “dial in” to any Chief Dispatcher site.

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  • Features
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  • Steam, Hot Water, and Condensing Hot Water Boiler Control
  • Pre-engineered for quick delivery and affordability
  • Communicates to alphanumeric pagers and Building Automation Systems

Mechanical

Case Size: 16½" H x 14½" W x 6¾" D

Enclosure Type: Wall mounted

Case: 7 Slot, (CPU + 6 I/O Slots)

Weight: 55 lbs.

Environmental

Operating Temperature: 32° to 122° F (0° to 50° C)

Storage Temperature: -20° to 150° F (-28° to 65° C)

Humidity Limits: 15% to 95% (non-condensing)

Enclosure: NEMA 1

Performance

Accuracy: 0.025% Analog I/O

Resolution: 16 bit input/12 bit output

Microprocessor: 32 bit, 128k EEPROM

Execution Cycle: Five per second

Time/Date Clock: (battery backed)

Operator Control Panel

LCD Graphic Display:  2.9" H x 5.1" W

Keyboard: Membrane, tactile feedback

Historial Data

Displays: 8 or 40 minute or 2, 8 or 24 hour charts

Memory: Non-Volatile, 32 MB. 48 points every 15 sec for 30 days, or greater with data compression
     
Configuration

Standard Lead/Lag: Menu style “Fill-In-The-Blanks” setup.

Control Language: Function block style, 60 functions, 600 Blocks

Security: 2 password levels

Custom Blockware Configuration Software: PWC_Edit™ spread sheet based or PWC_Draw™ graphical, editor.  (Windows PC Required)

Communication

Control Network;

Protocol: Modbus (ASCII or RTU mode)

Speed: 1200 to 38,400 baud  Type: RS485, optically isolated

Telephone Modem (optional): Internal Card 33,600 baud, RJ-11 Jack, Data and Pagers

Printer Port: Alarms/Logs, DB25F connector

Programming Port;

Speed: 9600 to 38,400 baud

Type: RS232, DB9F connector

Electrical

Input Power: 120 VAC (+/- 15%), 12 A total, 0.7A internal Built in surge suppressors

Internal Power Supply: 24 VDC @ 300 mADC for external use

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