Sterling SDA 1000-5100 specifications Large Dehumidifying Dryers Troubleshooting

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Problem	Possible Cause	Corrective Action
Loss or reduction in	Process heaters are faulty.	Replace.
drying capacity.	Desiccant beds are contaminated.	Replace desiccant.
	Material being dried differs from	Drying systems are designed for
	material specified at the time of	the material that was originally
	purchase.	specified. Different materials may
		need a longer residence time or
		different drying temperature.
	Break in flex hose to/from drying	Inspect for air leaks; replace if
	hopper.	necessary.
	Blower fins filled with dust or	Remove blower side plate, clean
	contaminants.	baffles, replace. Replace filter
		elements.
Material in drying	Process temperature set too high	Check resin manufacturer's data
hopper cakes, or	due to operator error.	sheet for proper drying
meltdown occurs.		temperature. Make sure plant
		personnel are aware of the correct
		process temperature Set Point.
	High temperature alarm not set	See Section “Temperature Screen
	properly.	Setup” on page 29.
	Process set point is out of	Restore temperature controller to
	acceptable range.	factory pre-sets. Auto-tune if
		necessary.
Poor Dew Point	Burned out regeneration heater.	Repair or replace.
Performance.	Contaminated or worn out	Replace.
	desiccant.
	Leaking process air hoses.	Repair or replace.
	Dryer is being operated beyond its	Check dryer and drying hopper
	capacity.	sizing.
	Bad dew point sensor.	Replace.
	Fouled dew point sensor manifold.	Clear obstruction. Air should flow
		freely through sensor.

Large Dehumidifying Dryers

Troubleshooting

50

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Contents SDA Large Dehumidifying Dryers With AP0 Controls Event of Shipping Damage Shipping InfoUnpacking and Inspection If the Shipment is Not CompleteCredit Returns Warranty ReturnsReturns Table of Contents Operation Dryer Identification Serial Number Tag Technical Assistance Safety Symbols Used in this Manual SafetyHow to Use This Manual Dryer Safety Tags Description Wear Safety Glasses and Work GlovesOperator Responsibility ResponsibilityGeneral Responsibility Maintenance Responsibility Reporting a Safety Defect General Description Functional DescriptionModels Covered in This Manual Process/Regeneration Cycle Regeneration CycleSequence of Operation Controller Description Controller Screen DescriptionsElectrical Features Standard FeaturesMechanical Features Process Aftercooler OptionsClosed-Loop Regeneration Material Overdrying Protection Recommended Temperature SettingsProcess Air Dust Collector Mechanical Options Electrical OptionsSafety Device Lock-Outs Safety Devices and InterlocksSafety Circuit Standards Fail Safe OperationPage Rigging and Placing Unit Mechanical InstallationUncrating the Equipment Making Electrical ConnectionsChecking for Proper Blower Rotation Checking Blower RotationMaking Dryer/Drying Hopper Process Air Connections Dryer/Drying Hopper Process Air ConnectionsConnecting Aftercooler/Precooler Cooling Water Optional Aftercooler Components & Flow RatesUsing the Drying Hopper Air Trap Drying Hopper Air TrapProcess Air Temperature Controller SwitchesIndicator Lights ControlsIndicator Name Description Lit when Control Output 1 is on. The Out1Lit when Control Output 2 is on. Not used Lights in the Operation Indicator Section whenSetting the Process Air Temperature E5CN Operating ParametersAdjustment Level Indicator Name Description Tuned prior to dryer startupEntering Operating Parameters to Select Modes ON, OFFOptional Setting the High Dew Point AlarmProcess Air Dew Point Display Watlow Operating Parameters Redundant Safety Controller DisplaySetting the Redundant Safety Controller Manf. setting Initial Start-up Auto-Tuning the DryerOperation Pre-Startup ChecksDryer Operation Procedures Page Material Miser OFF Press + to Enable Alarm Display Messages Auto-Tuning the Dryer Shutting Down the DryerPhotocopy this page for your maintenance records MaintenanceMaintenance Schedule Preventative Maintenance Cleaning or Replacing the Process Air FiltersCleaning or Replacing the Regeneration Filter Calibrating the Dirty Filter AlarmChecking the Dewpoint Control System Replacing the Desiccant Corrective MaintenanceSymptoms of Worn Out Desiccant Desiccant Tower Assembly Replacing the Process Heater Electric DryersProcess Heater Box Assembly Replacing the Regeneration Heater Electric DryersRegeneration Heater Box Assembly Introduction TroubleshootingBasic Troubleshooting Large Dehumidifying Dryers Troubleshooting Alarm Alarm Description Alarm Effect Code AlarmsAlarm Descriptions Using a Platinum Resistance Thermometer Determining Temperature Controller Errors or Sensor ErrorsUsing a Thermocouple Warranty AppendixAnnex B Information Technical SpecificationsAftercooler Design Specifications Drawings and Diagrams Optional dryer dust collector Spare Parts List Level 3 Mechanical Components Dryer Identification Serial Number Tag Located on back of DryerParts and Service Department Parts Department Service DepartmentTechnical Assistance Sales Department