model 2704 controller installation and operation handbook - Soliton

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Tuning 2704 Controller 8.5.2. Integral action and manual reset In a full three-term controller (that is, a PID controller), the integral term automatically removes steady state errors from the setpoint. If the controller is set up to work in two-term mode (that is, PD mode), the integral term will be set to ‘OFF’. Under these conditions the measured value may not settle precisely at setpoint. When the integral term is set to ‘OFF’ the parameter manual reset appears in the Loop Setup (PID) page. This parameter represents the value of the power output that will be delivered when the error is zero. You must set this value manually in order to remove the steady state error. 8.5.3. To Manually Set PID Values See Section 9.2 ‘To Set Up PID Parameters ‘. 8.5.4. Valve Position Control See section 9.7 ‘Control of Valve Positioning Motors’, for an explanation of the additional parameters required for motorised valves and how to set the values of these parameters. 8-10 Installation and Operation Handbook. Part No HA026502 Issue 1.0 Apr-00
2704 Controller Tuning 8.6. GAIN SCHEDULING Gain scheduling is the automatic transfer of control between one set of PID values and another. In the case of the 2704 controller, this is done at a presettable value of SP, PV Error or OP. This is determined in configuration level. Gain scheduling is used for the more difficult to control processes which exhibit large changes in their response time or sensitivity at, for example, high and low PVs, or when heating or cooling. The 2704 controller has three sets of PID values. You can select the active set from either a digital input, or from a parameter in the Loop Setup(PID) page, see Chapter 9, or you can transfer automatically in gain scheduling mode. The transfer is bumpless and will not disturb the process being controlled . 8.6.1. To Use Gain Scheduling If gain scheduling has been enabled in configuration level:- Do This 1. From any display press as many times as necessary to access the page header menu 2. Press or to select ‘LP1 SETUP’ This Is The Display You Should See Additional Notes Alternatives are LP 2 and LP 3. These only appear in the list if the loops are configured LPx SETUP page is at Level 3 by default but may have been promoted to L1 or L2. 3. Press to display subheaders 4. Press or to select ‘PID’ 5. Press to show the parameter list. 6. Press again to select ‘Active PID Set’. 7. Press or to select the PID set to use for gain scheduling The choices are PID Sets 1 to 3. To change the active PID set, press to select, then press or to change. You must now set up the three sets of PID values. The values can be manually set, or automatically tuned as described earlier in this chapter. When tuning automatically you must tune three times, once below the switching point ‘1/2 Boundary’ once between 1/2 Boundary’ and ‘2/3 Boundary’ ‘ and finally above ‘2/3 Boundary’. Installation and Operation Handbook. Part No HA026502 Issue 1.0 Apr-00 8-11
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2704 Controller Contents MODEL 2704
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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 Safety and EMC Info
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2704 Controller Technical Specifica
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