model 2704 controller installation and operation handbook - Soliton

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Loop Set Up 2704 Controller 9.5.3. Setpoint Tracking When the control loop is placed in manual or ratio has been deselected, setpoint tracking can be used to recalculate the actual achieved ratio, thereby ensuring bumpless transfer between modes. If the input from the lead process value at any time becomes invalid, then the working setpoint of the loop will remain at its current value 9.5.4. Ratio Control Parameters LP1 SETUP (Ratio Page) Table Number: 9.5.4. This list allows you to set up parameters specific to ratio controllers LP1 SETUP (Ratio Page) Parameter Name Parameter Description Value Default Access Level Lead PV The value of the lead process variable L1 Measured Ratio Measured Ratio R/O Ratio WSP Ratio working setpoint R/O Ratio Lo Lim Ratio setpoint low limit L3 Ratio Hi Lim Ratio setpoint high limit L3 Ratio SP Ratio setpoint L1 Enable Ratio Ratio enable No Yes Ratio Trim Ratio trim value L1 L1 9-12 Installation and Operation Handbook. Part No HA026502 Issue 1.0 Apr-00
2704 Controller Loop Set Up 9.6. OVERRIDE CONTROL 9.6.1. Introduction: Override Control allows a secondary control loop to override the main control output in order to prevent an undesirable operating condition. The override function can be configured to operate in either minimum, maximum or select mode. A typical example can be implemented in a heat treatment furnace with one thermocouple attached to the workpiece, and another situated close to the heating elements. Control of the furnace during the heating up period is regulated by the override (heating element) temperature controller which provides a safeguard against overheating. Control of the furnace will switch over to the workpiece temperature controller at some point when the temperature is near to its target setpoint. The exact point of switchover is determined automatically by the controller, and will be dependent on the selected PID terms. 9.6.2. Simple Override Override control is available with analogue, time proportioning and ON/OFF control outputs. It is not available with valve position outputs. Figure 9.3 shows a simple override control loop. The main and override controller outputs are fed to a low signal selector. The override controller setpoint is set to a value somewhere above the normal operating setpoint, but below any safety interlocks. There is one Auto Manual switch for both loops. In manual mode the control outputs of both loops track the actual output therefore ensuring bumpless transfer when auto is selected. Main SP Main PV Override SP Main Control Loop Main OP Min select Control Output Override PV Override Control Loop Override OP Figure 9-3: Simple Override Control Installation and Operation Handbook. Part No HA026502 Issue 1.0 Apr-00 9-13
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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 9.5.1. Int
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2704 Controller Contents 18. CHAPTE
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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 Installation 2.1.3.
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2704 Controller Diagnostics 20. CHA
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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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