Sterling SDA Series Large Dehumidifying Dryer: Troubleshooting Guide
Page 65

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 34.

 

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

65

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Contents SDA 1000-5100 Series Large Dehumidifying Dryer AP-1 Control Unpacking and Inspection Shipping InfoEvent of Shipping Damage If the Shipment is Not CompleteCredit Returns ReturnsTable of Contents Operation Large Dehumidifying Dryers Safety Symbols Used in this Manual SafetyHow to Use This Manual Dryer Safety Tags Description Operator Responsibility ResponsibilityGeneral Responsibility Maintenance Responsibility Reporting a Safety Defect General Description Functional DescriptionModels Covered in This Manual Sequence of Operation Process/Regeneration CycleAuto Start Timer Standard FeaturesMechanical Features Electrical FeaturesClosed-Loop Regeneration OptionsDewpoint Extend Drawings and Diagrams Optional dryer dust collector Process Air Dust Collector Aftercooler Design SpecificationsProcess Aftercooler Process Air Dust Collector Material Overdrying Protection Recommended Temperature SettingsController Options Mechanical OptionsElectrical Options Safety Circuit Standards Safety Devices and InterlocksSafety Device Lock-Outs Fail Safe OperationPage Mechanical Options Denotes availability Dimensions and Specifications Denotes availabilityDenotes availability Uncrating the Equipment Mechanical InstallationRigging and Placing Unit Making Electrical ConnectionsDescription Making Gas Line Connections Gas-Fired Models OnlyChecking Blower Rotation Checking for Proper Blower RotationDryer/Drying Hopper Process Air Connections Making Dryer/Drying Hopper Process Air ConnectionsProcess Air Heater on Drying Hopper Large Dehumidifying Dryers Mechanical Installation Aftercooler Components & Flow Rates Connecting Aftercooler/Precooler Cooling Water OptionalDrying Hopper Air Trap Using the Drying Hopper Air TrapController Description ControlsDryer Status Screen Startup Screen Process Air Temperature and Conveying Process ControllerMain Menu Screen Dryer Alarms Help System LOG OFFIdentifying Controller Screens Setting Values Auto Start Main Menu Dryer Status Dryer Setup Over DRY Protect Alarms Auto TuneDryer Menu Dryer Setup Screen 4 Dryer Setup Screen 2Dryer Setup Screen 3 Overdry Protection Screen 2 Overdry ProtectionOverdry Protection Screen 1 Process AutoTune Screen Alarm History ScreenAutotune Dew Point Setup Screen DEW Point SetupAutostart Timer Screen Auto StartHelp Menu System Setup SET Clock Hour Meters Alarm History StatusHelp Menu Screen System MenuLOW Level Detection Setup System Backup Service Menu Main Menu System SetupSystem Setup Screen Autostart Clock Screen Clock Menu ScreenInput Status Hour Meter ScreenInput Status Screen Output StatusService Menu Screen System Backup ScreenService Alarm Screens Alarm Screen Example Redundant Safety Controller DisplayAlways put your set point to 30F above set point Setting the Redundant Safety ControllerLarge Dehumidifying Dryers Controls Start-up OperationUsing the Dryer Status Screen Alarm Descriptions AlarmsShutdown Photocopy this page for your maintenance records MaintenanceMaintenance Schedule Cleaning or Replacing the Process Air Filters Preventative MaintenanceCalibrating the Dirty Filter Alarm Cleaning or Replacing the Regeneration FilterChecking the Dewpoint Control System Replacing the Desiccant Corrective MaintenanceSymptoms of Worn Out Desiccant Replacing the Process Heater Electric Dryers Desiccant Tower AssemblyReplacing the Regeneration Heater Electric Dryers Process Heater Box AssemblyRegeneration Heater Box Assembly Introduction TroubleshootingBasic Troubleshooting Large Dehumidifying Dryers Troubleshooting Using a Platinum Resistance Thermometer Determining Temperature Controller Errors or Sensor ErrorsUsing a Thermocouple Appendix WarrantyAnnex B Information Technical SpecificationsSpare Parts List Level 3 Mechanical Components Located on back of Dryer Dryer Identification Serial Number TagTechnical Assistance Service DepartmentParts Department Sales Department

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