Compressed Air Dryer Chapter 6: Troubleshooting 24 of 31Chapter 6: TroubleshootingThe utmost in safety precautions should be observed at all times when working on or aroundthe machine and the electrical components. All normal trouble-shooting must beaccomplished with the unit turned off, power disconnected, and with the machine tagged asout of service.Problem Possible Cause Possible RemedyLoss or reduction in dryingcapacity.Material being dried differsfrom material specified at thetime of purchase.Drying systems are designedfor the material that wasoriginally specified.Different materials may needa longer residence time or adifferent drying temperature.Break in flex hose to dryinghopper.Inspect for air leaks; replaceas needed.Material in drying hoppercakes, or meltdown occurs.Process temperature set toohigh due to operator error.Check resin manufacturer’sdata sheet for proper dryingtemperature. Make sure plantpersonnel are aware of thecorrect process temperatureset point.High temperature alarm notset properly.Reset high temperaturealarm.Nothing displays when thecontroller is turned on.Process set point is out ofacceptable range.Restore temperaturecontroller to factory pre-sets.Function set for degreesCelsius (ºC), set point atdegrees Fahrenheit (ºF).Verify correct Celsius orFahrenheit settings.Process thermocouple not inairflow.Verify that the thermocoupleis properly installed in theinlet tube.No setting change possible ontemperature controller.The internal mechanism isnot inserted properly into thehousing.Properly insert the internalmechanism into the housing.The power supply is notconnected to its terminalsproperly.Properly connect the powersupply to the power supplyterminals.No power is supplied, or thesupplied power is not withinthe specified range.Supply a voltage of 85 to125 VAC to the powersupply terminals of thecontroller or 220-240 V forhigher voltage units.