Eurotherm 2408 temperature flashing above 425
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- #Eurotherm 2408 temperature flashing above 425 how to#
- #Eurotherm 2408 temperature flashing above 425 full#
- #Eurotherm 2408 temperature flashing above 425 download#
If the contactor coil is energised check for failure to operate or contacts burnt out. Check the heater circuit for loss of line voltage, blown fuses, tripped breaker or heater open circuit. Temperature well below set point but heat remains off. This problem, incorrect use of thermocouple extension cable, is covered in a separate article. This error can vary during the day from not noticeable to some 100deg F too hot depending on how near the thermocouple head is to the process heat and how long the zone has been on. PROBLEM: Zone temperature comes up normally at start-up, then the process slowly gets too hot, yet the controller indication stays normal. Some controllers can be configured to sense an abnormally low or negative reading, cut the heat off and show an under-range message. Beware the RED IS NEGATIVE convention on North American thermocouple extension wires. If the temperature indication goes below room temperature check for crossed thermocouple wires. PROBLEM: Temperature indication stays abnormally low but the process overheats Check for sensor pulled away from the heat or stray wire strands bridging the sensor’s wiring. That can be all right the controller PID action will slowly work it out and settle down, delivering just enough heat or cool to hold the correct temperature. A small overtemperature doesn’t necessarily take all the heat off, nor does a small undertemperature necessarily bring heat on. If temperature is at or anywhere near set point the output state is not totally predictable with PID controllers.
#Eurotherm 2408 temperature flashing above 425 full#
Cooling if fitted will be full on.įor a quick test take the set point up and down through the indicated temperature and watch the output change. If temperature is well above set point the heat will be off or at minimum value. If temperature is well below set point the heat will be on steady at its maximum value. Lights showing ON/OFF state of contactors, solenoid valves or blowers are useful aids. Fit ammeters on every electrical heater otherwise check heater currents with a clamp-on ammeter. This could be heater current, valve position, pump speed etc. The most important diagnostics aid is transparency of the process by means of indicators or screens showing what the process is doing, allied with experience and records of the normal behaviour pattern.įor observing a control loop in action make sure you can see at all times, indications of process temperature and set temperature (set point) also the final controlled output. Separate high-speed semiconductor fuses from regular HRC types. Separate and label controllers that are appearance and plug-in compatible but differ functionally. Only good parts belong on the spares shelf. For removed parts, attach a ‘what’s wrong’ label repair promptly. Put a permanent sticker on the control cabinet showing names and phone numbers of contractors and suppliers who can help with parts or trouble shooting. When checking, use insulated test probes. If you cheat a door-latch isolator be aware of live and dangerous parts inside.
#Eurotherm 2408 temperature flashing above 425 how to#
Know how to open enclosures without shutting down. Vet them and if this is new equipment specify that payment to suppliers is conditional upon acceptable documentation. Know where to find the wiring and piping drawings keep them up to date after changes. Note what to expect of any change or adjustment you make. These do not normally need resetting except for major changes in process dynamics or when you replace a controller. temperature, speed, current, that can vary by batch or job.
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Identify and label items such as control zone IDs, temperature controllers, sensors, plugs and sockets, heaters, heater contactors, SCRs, control valves, meters, indicators, control knobs, switches and push-buttons, electrical disconnects, fuses and breakers (with ratings), indicator lights, terminals and blocks, supply voltages and wiring identification.įor controllers, list settings, e.g.
#Eurotherm 2408 temperature flashing above 425 download#