Appendix A: Application Examples
A.3 Furnace Pressure Control with 3-State Pulse Output
493-0736-11 (6-2)
227
A.3 Furnace Pressure Control with 3-State
Pulse Output
Description
This example shows how to control the pressure in a steam boiler furnace with a
draught valve motor at the flue duct. High and low pressure alarms are required
at 0.000 kPa and +0.500 kPa respectively.
Definition of Control Problem
The object is to control the furnace pressure as shown in the figure below. The
valve motor M is of the increase/decrease type and has position feedback in the
form of a potentiometer (Pot) on the valve. The pressure is measured by the
transducer PT1. An ECA60 or an ECA600 can be used to solve this problem.
Figure 5
Furnace Pressure Controlled by a Draught Valve.
Mechanical Installation
Please refer to chapter 2 of this manual for details of the mechanical installation.
Preset Configuration
None of the preset configurations match our requirements exactly so we will start
with the Default Setup and modify that.
Draught valve
Furnace
PICA1
PT1
M
Pot
Summary of Contents for ECA06
Page 1: ...Version 1 05 ECA06 60 600 EMA60 Configuration and Installation ...
Page 2: ......
Page 3: ...ECA06 60 600 EMA60 Configuration and Installation ...
Page 10: ...Contents vi 493 0736 11 6 2 ...
Page 16: ...1 5 Version information Chapter 1 Introduction 16 493 0736 11 6 2 ...
Page 200: ...4 2 Annual Check Chapter 4 Maintenance 200 493 0736 11 6 2 ...
Page 286: ...Appendix A Configuration Work Sheets 282 493 0736 11 6 2 ...
Page 304: ...B 1 Total Reset Appendix B Special Modes 298 493 0736 11 6 2 ...
Page 308: ...Index 302 493 0736 11 6 2 ...
Page 309: ......