Troubleshooting, Introduction | Sterling SDA 1000-5100 guide

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

49

Image 49

Sterling SDA 1000-5100 specifications Introduction, Basic Troubleshooting

Contents

SDA Large Dehumidifying Dryers With AP0 Controls Unpacking and Inspection Shipping InfoEvent of Shipping Damage If the Shipment is Not Complete Returns 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 Description General Responsibility ResponsibilityOperator Responsibility Maintenance Responsibility Reporting a Safety Defect Models Covered in This Manual Functional DescriptionGeneral Description Regeneration Cycle Process/Regeneration Cycle Sequence of Operation Controller Screen Descriptions Controller Description Mechanical Features Standard FeaturesElectrical Features Closed-Loop Regeneration OptionsProcess Aftercooler Process Air Dust Collector Recommended Temperature SettingsMaterial Overdrying Protection Electrical Options Mechanical Options Safety Circuit Standards Safety Devices and InterlocksSafety Device Lock-Outs Fail Safe OperationPage Uncrating the Equipment Mechanical InstallationRigging and Placing Unit Making Electrical Connections Checking Blower Rotation Checking for Proper Blower Rotation Dryer/Drying Hopper Process Air Connections Making Dryer/Drying Hopper Process Air Connections Aftercooler Components & Flow Rates Connecting Aftercooler/Precooler Cooling Water Optional Drying Hopper Air Trap Using the Drying Hopper Air Trap Indicator Lights SwitchesProcess Air Temperature Controller Controls Lit 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 when E5CN Operating Parameters Setting the Process Air Temperature Tuned prior to dryer startup Adjustment Level Indicator Name Description ON, OFF Entering Operating Parameters to Select Modes Process 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 Checks Dryer Operation Procedures Page Material Miser OFF Press + to Enable Alarm Display Messages Shutting Down the Dryer Auto-Tuning the Dryer Maintenance Schedule MaintenancePhotocopy this page for your maintenance records Cleaning or Replacing the Process Air Filters Preventative Maintenance Calibrating the Dirty Filter Alarm Cleaning or Replacing the Regeneration Filter Checking the Dewpoint Control System Symptoms of Worn Out Desiccant Corrective MaintenanceReplacing the Desiccant Replacing the Process Heater Electric Dryers Desiccant Tower Assembly Replacing the Regeneration Heater Electric Dryers Process Heater Box Assembly Regeneration 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 Warranty Aftercooler 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 Tag Parts and Service Department Technical Assistance Service DepartmentParts Department Sales Department