model 2704 controller installation and operation handbook - Soliton

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Safety and EMC Information 2704 Controller B.3.11. Over-temperature protection When designing any control system it is essential to consider what will happen if any part of the system should fail. In temperature control applications the primary danger is that the heating will remain constantly on. Apart from spoiling the product, this could damage any process machinery being controlled, or even cause a fire. Reasons why the heating might remain constantly on include: • the temperature sensor becoming detached from the process; • thermocouple wiring becoming short circuit; • the controller failing with its heating output constantly on; • an external valve or contactor sticking in the heating condition; • the controller setpoint set too high. Where damage or injury is possible, we recommend fitting a separate over-temperature protection unit, with an independent temperature sensor, which will isolate the heating circuit. Please note that the alarm relays within the controller will not give protection under all failure conditions. B.3.12. Grounding of the temperature sensor shield In some installations it is common practice to replace the temperature sensor while the controller is still powered up. Under these conditions, as additional protection against electric shock, we recommend that the shield of the temperature sensor is grounded. Do not rely on grounding through the framework of the machine. B.4. INSTALLATION REQUIREMENTS FOR EMC To ensure compliance with the European EMC directive certain installation precautions are necessary as follows: • For general guidance refer to EMC Installation Guide, HA025464. • When using relay or triac outputs it may be necessary to fit a filter suitable for suppressing the emissions. The filter requirements will depend on the type of load. For typical applications we recommend Schaffner FN321 or FN612. B.4.1. Routing of wires To minimise the pick-up of electrical noise, the wiring for low voltage dc and particularly the sensor input should be routed away from high-current power cables. Where it is impractical to do this, use shielded cables with the shield grounded at both ends. B-6 Engineering Handbook. Part No HA026502 Issue 2.0 Apr-00
2704 Controller Technical Specification C. APPENDIX C TECHNICAL SPECIFICATION.................... 2 C.1. ALL ANALOGUE, DUAL AND PV INPUTS ..........................................2 C.2. PRECISION PV INPUT / MODULE........................................................3 C.3. DUAL (PROBE) INPUT MODULE..........................................................3 C.4. ANALOGUE INPUT ..................................................................................4 C.5. ANALOGUE INPUT MODULE................................................................4 C.6. STANDARD DIGITAL I/O........................................................................5 C.7. DIGITAL INPUT MODULES ...................................................................5 C.8. DIGITAL OUTPUT MODULES...............................................................5 C.9. ANALOGUE OUTPUT MODULES .........................................................5 C.10. TRANSMITTER PSU...............................................................................5 C.11. TRANSDUCER PSU.................................................................................6 C.12. POTENTIOMETER INPUT....................................................................6 C.13. DIGITAL COMMUNICATIONS............................................................6 C.14. ALARMS ...................................................................................................6 C.15. USER MESSAGES ...................................................................................6 C.16. CONTROL FUNCTIONS ........................................................................6 C.17. SETPOINT PROGRAMMER .................................................................7 C.18. ADVANCED FUNCTIONS......................................................................7 C.19. GENERAL SPECIFICATION.................................................................7 C.20. GRAPHICAL REPRESENTATION OF ERRORS...............................8 C.20.1. mV Input...................................................................................................8 C.20.2. Mid range high impedance Input..............................................................9 C.20.3. High Level Input.....................................................................................10 C.20.4. RTD (Pt-100) Input type .......................................................................11 C.20.5. Thermocouple Input type........................................................................13 Installation and Operation Handbook. Part No HA026502 Issue 2.0 Apr-00 C-1
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2704 Controller Contents MODEL 2704
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2704 Controller Introduction ➃
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model 2704 controller installation and operation handbook - Soliton

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