model 2704 controller installation and operation handbook - Soliton

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Module IO 2704 Controller 18.4.3. Output modules If the output module is DC or if it is a relay, triac or logic used as time proportioning control, it can be scaled such that a lower and upper level of PID demand signal can limit the operation of the output value. This is shown in Figure 18-2 applied to a relay output or any time proportioning output.. By default, the relay will be fully off for 0% power demand, fully on for 100% power demand and equal on/off times at 50% power demand. You can change these limits to suit the process. It is important to note, however, that these limits are set to safe values for the process. For example, for a heating process it may be required to maintain a minimum level of temperature. This can be achieved by applying an offset at 0% power demand which will maintain the relay on for a period of time. Care must be taken to ensure that this minimum on period does not cause the process to overheat These offsets can be made to parameters in the relevant Module IO pages. If the output is DC the electrical low and electrical high parameters are analogue values and can be set as in the example given for DC Output Retransmission, section 18.4.3. PID Demand signal Eng Value Hi eg 100% Eng Value Lo eg 0% Electrical Lo eg Relay Permanently off Í Electrical Hi eg Relay permanently on Î Electrical Output. In this example the on/off ratio of the output relay Figure 18-2: Time Proportioning Relay, Triac or Logic Output 18-18 Installation and Operation Handbook. Part No HA026502 Issue 1.0 Apr-00
2704 Controller Module IO 18.4.4. To Scale A Control Output:- Do This 1. From the MODULE IO subheader display, Press or to choose the slot in which the Output module is fitted This Is The Display You Should See Additional Notes 2. Press to show the list of parameters. 3. Press or to scroll to ‘Electrical Lo’ Set this to a low value, normally 0. 4. Press to select the Electrical Lo. 5. Press to select the Electrical Hi. 6. Press or to change the value Set this to a high value, normally 100. 7. Press to select the Eng Val Lo. 8. Press or to change the value Set up this value so that the relay (triac or logic) switches fully off corresponding to the Electrical Low setting 9. Press to select the Eng Val Hi. 10. Press or to change the value Set up this value so that the relay (triac or logic) switches fully on corresponding to the Electrical High setting Installation and Operation Handbook. Part No HA026502 Issue 1.0 Apr-00 18-19
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2704 Controller Contents MODEL 2704
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2704 Controller Contents B. APPENDI
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2704 Controller Introduction ➃
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2704 Controller Introduction 1.4.1.
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model 2704 controller installation and operation handbook - Soliton

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