Walton C Series User Manual
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Watlow Series C • 15 • TroubleshootingTroubleshootingIndication Probable Cause(s) Corrective ActionOn indicating controls, thedisplay is not illuminated. • Power supply switch off. • Turn switch on.• Fuse blown. • Replace fuse (check cause of failure).• Breaker tripped. • Reset breaker (check cause of failure).• Safety interlock door switch activated. • Close door.• Separate system limit control latched. • Reset limit controller.• Wiring incorrect or open. • Check wiring.• Power supply voltage incorrect. • Verify input power.• Defective controller. • Repair or replace controller.Troubleshooting thermocouple inputsTemperature reading isincorrect, showing a sen-sor error, [Er;In] , or LOADLED is switching at thewrong temperature.• Calibration offset is incorrect (tactilemodels only).Check calibration offset.• Settings for degree C or F is incorrect. Check model part number for degree C or F.If model has Increment/Decrement keys thenC/F setting is adjustable.• Sensor or controller may be bad.Sensor connections may be bad.• Place a jumper wire across the thermo-couple input terminals. The display shouldindicate ambient temperature. If it does, thecontroller is OK.For controllers without the ability to viewprocess temperature:- Decrease set point below ambient tempera-ture, LOAD LED should be off for heatingcontrollers and on for cooling controllers.- Increase set point above ambient tempera-ture. LOAD LED should be on for heatingcontrollers and off for cooling controllers.• Ambient temperature in the controlcabinet is over 70°C.• Measure temperature in cabinet to ensureit is below 70C. Vent cabinet or add fans ifnecessary.• Ground loop problem. Can occurwhen using a switched DC output anda grounded thermocouple.• Remove power from the system. Use anohm meter to measure resistance betweenoutput DC- and the thermocouple sheath. Ifthere is continuity, replace sensor with anungrounded thermocouple.Temperature reading is de-creasing, but actual processis increasing.• Thermocouple polarity is reversed. Inthe US, red wire insulation denotes thenegative wire.• Check thermocouple connections. All con-nections, including extension wire mustmaintain the correct polarity. Correct polarityproblems.Temperature reading isreading low and not increas-ing while actual processtemperature is increasing.• Sensor is bad. Thermocouple is short-ed.• Check thermocouple connections. Checkthermocouple wire insulation to make sureit is not damaged, causing the wires to short(making a new junction).Temperature reading isoffset from actual processtemperature, or the outputswitches on or off at thewrong temperature. The off-set changes with changes inprocess temperature.• Copper wire was used instead of ther-mocouple extension wire. Connectorsof metals different than thermocouplemetal were used to splice or make con-nections.• Check thermocouple connections. Check tomake sure that only thermocouple extensionwire of the correct type was used to extendthermocouple leads. Replace if necessary.Buy: www.ValinOnline.com | Phone: 844-385-3099 | Email: CustomerService@valin.com |
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