model 2704 controller installation and operation handbook - Soliton

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Standard IO 2704 Controller 17.4. THE FIXED RELAY OUTPUT PARAMETERS Allows access to parameters which set up the fixed Relay output connected to terminals AA, AB and AC. This relay may be used as an alarm relay. or a time proportioning control output. 17.5. TO SCALE THE FIXED RELAY OUTPUT If the relay is used as a time proportioning control output this means that the relay will, by default, be fully off for 0% power demand, fully on for 100% power demand and equal on/off times at 50% power demand. As with input scaling 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 ‘AA Relay’ pages. The above example is shown in Fig 17-2 PID Demand signal Eng Value Hi eg 100% Eng Value Lo eg 0% Electrical Lo eg Relay on for short period Electrical Hi eg Relay permanently on Electrical Output. In this example the on/off ratio of the output relay Table 17-2: Fixed Relay Scaling 17-8 Installation and Operation Handbook. Part No HA026502 Issue 1.0 Apr-00
2704 Controller Standard IO To set up and scale the Fixed Relay Output proceed as follows Do This 1. From any display press as many times as necessary to access the page header menu 2. Press or to select ‘STANDARD IO’ This Is The Display You Should See Additional Notes The AA Relay is connected to terminals AA,AB and AC 3. Press to show Subheaders 4. Press or to scroll to the AA Relay Page 5. Press to show the AA Relay parameter list 6. Press again to select ‘Min Pulse Time’ This parameter applies to time proportioning outputs only. Auto = 0.05sec 7. Press or to choose ‘Auto’ or a minimum on/off time for the relay 8. Press to select ‘Electrical Lo’ 9. Press or to adjust the value If the relay is wired to the PID output demand signal, as shown in Figure 17-2,.set this to a low value, normally 0. 10. Press to select ‘Electrical Hi’ 11. Press or to adjust the value If the relay is wired to the PID output demand signal, as shown in Figure 17-2,.set this to a high value, normally 100. Installation and Operation Handbook. Part No HA026502 Issue 1.0 Apr-00 17-9
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2704 Controller Contents MODEL 2704
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