Sterling SDA 1000-5100 specifications Introduction, Basic Troubleshooting

Page 49

Chapter 7: Troubleshooting

7-1 Introduction

The utmost in safety precautions should be observed at all times when working on or around the machine and the electrical components. All normal trouble-shooting must be accomplished with the power off, line fuses removed, and with the machine tagged as out of service.

Before making haphazard substitutions and repairs when defective electrical components are malfunctioning, we recommend that you check the associated circuitry and assemblies for other defective devices. It is common to replace the obviously damaged component without actually locating the real cause of the trouble. Such hasty substitutions will only destroy the new component. Refer to wiring diagrams and schematics.

7-2 Basic Troubleshooting

Problem

Possible Cause

Corrective Action

Little or no air

Dirty Filters

Clean or replace filters.

coming from

Desiccant beds contaminated by

Replace desiccant See page 46.

process delivery

material or plasticizer leaking

 

tube.

into the system.

 

 

Blower fuse(s) blown.

Fix problem and Replace fuse(s).

 

Overload tripped.

Fix problem and reset the

 

 

overload.

 

Blower fins filled with dust or

Remove blower side plate, clean

 

contaminants.

baffles, replace.

Suction in delivery

Phase is reversed on power drop

Stop the Dryer.

tube, pressure from

coming into the dryer.

If the dryer was connected to the

the return tube.

 

drying hopper, check to see if the

 

 

desiccant and process air heater

 

 

has been contaminated with resin.

 

 

If so, replace the desiccant and

 

 

remove any resin carry-over.

 

 

Otherwise, change the phase of

 

 

two legs of the three-phase power

 

 

drop. Never change the phase at

 

 

the motor starters unless only one

 

 

of the two blowers is rotating

 

 

improperly.

Loss or reduction of

Process heaters are faulty.

Check for open or shorted heaters.

process air

 

Replace if required. Check the

temperature.

 

fuses.

 

Solid-state temperature controller

Replace.

 

faulty.

 

 

Process temperature was adjusted

Make sure that plant personnel are

 

in error by plant personnel.

aware of the proper temperature

 

 

set point. A sign posted next to the

 

 

control would be helpful.

Large Dehumidifying Dryers

Troubleshooting

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Contents SDA Large Dehumidifying Dryers With AP0 Controls Unpacking and Inspection Shipping InfoEvent of Shipping Damage If the Shipment is Not CompleteReturns Warranty ReturnsCredit Returns Table of Contents Operation Dryer Identification Serial Number Tag Technical Assistance How to Use This Manual SafetySafety Symbols Used in this Manual Wear Safety Glasses and Work Gloves Dryer Safety Tags DescriptionGeneral Responsibility ResponsibilityOperator Responsibility Maintenance Responsibility Reporting a Safety Defect Models Covered in This Manual Functional DescriptionGeneral Description Regeneration Cycle Process/Regeneration CycleSequence of Operation Controller Screen Descriptions Controller DescriptionMechanical Features Standard FeaturesElectrical Features Closed-Loop Regeneration OptionsProcess Aftercooler Process Air Dust Collector Recommended Temperature SettingsMaterial Overdrying Protection Electrical Options Mechanical OptionsSafety Circuit Standards Safety Devices and InterlocksSafety Device Lock-Outs Fail Safe OperationPage Uncrating the Equipment Mechanical InstallationRigging and Placing Unit Making Electrical ConnectionsChecking Blower Rotation Checking for Proper Blower RotationDryer/Drying Hopper Process Air Connections Making Dryer/Drying Hopper Process Air ConnectionsAftercooler Components & Flow Rates Connecting Aftercooler/Precooler Cooling Water OptionalDrying Hopper Air Trap Using the Drying Hopper Air TrapIndicator Lights SwitchesProcess Air Temperature Controller ControlsLit when Control Output 2 is on. Not used Lit when Control Output 1 is on. The Out1Indicator Name Description Lights in the Operation Indicator Section whenE5CN Operating Parameters Setting the Process Air TemperatureTuned prior to dryer startup Adjustment Level Indicator Name DescriptionON, OFF Entering Operating Parameters to Select ModesProcess Air Dew Point Display Setting the High Dew Point AlarmOptional Setting the Redundant Safety Controller Redundant Safety Controller DisplayWatlow Operating Parameters Manf. setting Operation Auto-Tuning the DryerInitial Start-up Pre-Startup ChecksDryer Operation Procedures Page Material Miser OFF Press + to Enable Alarm Display Messages Shutting Down the Dryer Auto-Tuning the DryerMaintenance Schedule MaintenancePhotocopy this page for your maintenance records Cleaning or Replacing the Process Air Filters Preventative MaintenanceCalibrating the Dirty Filter Alarm Cleaning or Replacing the Regeneration FilterChecking the Dewpoint Control System Symptoms of Worn Out Desiccant Corrective MaintenanceReplacing the Desiccant Replacing the Process Heater Electric Dryers Desiccant Tower AssemblyReplacing the Regeneration Heater Electric Dryers Process Heater Box AssemblyRegeneration Heater Box Assembly Basic Troubleshooting TroubleshootingIntroduction Large Dehumidifying Dryers Troubleshooting Alarm Descriptions AlarmsAlarm Alarm Description Alarm Effect Code Using a Thermocouple Determining Temperature Controller Errors or Sensor ErrorsUsing a Platinum Resistance Thermometer Appendix WarrantyAftercooler Design Specifications Technical SpecificationsAnnex B Information Drawings and Diagrams Optional dryer dust collector Spare Parts List Level 3 Mechanical Components Located on back of Dryer Dryer Identification Serial Number TagParts and Service Department Technical Assistance Service DepartmentParts Department Sales Department
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