model 2704 controller installation and operation handbook - Soliton

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Loop Set Up 2704 Controller Master PV Master PID Loop Csd Trim Lim Master SP Master OP Remote Input Csd FF Value Feedforward Selection Slave PV Slave PID Loop Control Output Figure 9-1: Cascade with Feedforward 9.4.5. Cascade Parameters LP1 SETUP (Cascade Page) Table Number: 9.4.5. This list allows you to set up parameters specific to cascade controllers LP1 SETUP (Cascade Page) Parameter Name Parameter Description Value Default Access Level Disable CSD Cascade disable status Off On CSD FF Value CSD FF Trim Lim Master OP Cascade feedforward value i.e. The value being fed forward Cascade feedforward trim limit i.e. The amount the master output can be trimmed up and down. Cascade master PID output power Range of signal being fed forward Range of slave loop Range of slave loop L1 L3 L3 R/O 9-10 Installation and Operation Handbook. Part No HA026502 Issue 1.0 Apr-00
2704 Controller Loop Set Up 9.5. RATIO CONTROL 9.5.1. Introduction Ratio Control is a technique used to control a process variable at a setpoint which is calculated as a proportion of a second (lead) input. The ratio setpoint determines the proportion of the lead value that is to be used as the actual control setpoint. The ratio setpoint can be applied as either a multiplier or as a divisor to the second input. A typical application is in gas fired furnaces where in order to achieve efficient combustion, the gas and air flow supplied to the burners needs to be maintained at a constant ratio. 9.5.2. Basic Ratio Control The 2704 contains a ratio control function block (function blocks are explained in the Engineering Manual Part No. HAxx) which can be used in any control loop. Figure 9.2 shows a block diagram of a simple ratio controller. The lead PV is multiplied or divided by the ratio setpoint to calculate the desired control setpoint. Prior to the setpoint calculation, the ratio setpoint can be offset by the ratio trim value and must obey the overall ratio setpoint operating limits. Another useful feature of the is the automatic calculation of the actual measured ratio which is then available to be displayed on the controller front panel. Ratio Trim Ratio SP Ratio Hi Limit Ratio SP Limits Ratio Lo Limit Working Ratio SP Lead PV Z/^ + Local Trim + Range Hi Main Process PV Range Lo Main Control Loop Control OP Figure 9-2: Simple Ratio Control Block Diagram Installation and Operation Handbook. Part No HA026502 Issue 1.0 Apr-00 9-11
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2704 Controller Contents MODEL 2704
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2704 Controller Contents 5. CHAPTER
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2704 Controller Contents B. APPENDI
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2704 Controller Contents LIST OF FI
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2704 Controller Contents Figure 18-
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2704 Controller Introduction 1. Cha
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2704 Controller Introduction ➃
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2704 Controller Introduction 1.4.1.
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2704 Controller Installation 2. CHA
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2704 Controller Getting Started 3.
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HUMIDITY INPUT OPERS TIMER BLOCKS P
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2704 Controller Diagnostics 20. CHA
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2704 Controller Diagnostics Note 1.
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2704 Controller Appendix A A. APPEN
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2704 Controller Appendix A B. QUICK
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2704 Controller Safety and EMC Info
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2704 Controller Technical Specifica
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model 2704 controller installation and operation handbook - Soliton

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