Sterling 882.00295.00 specifications Checking the Dewpoint Control System

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5.Remove the restricted filter cartridge from the housing again. The alarm light should stay off when the process blower operates if the switch is adjusted correctly.

6.Re-install the obstructed cartridge filter. The alarm light should go on again if the switch is adjusted correctly.

7.Fine tune the switch setting so it consistently warns of a blocked filter and does not falsely indicate a blockage of a clean filter.

8.Remove the restriction from the filter element and re-install the clean filter. The alarm light should remain off.

Checking the Dewpoint Control System

The Dewpoint Switch option on dryers depends on the proper operation of the dewpoint sensor and its control board. The dewpoint sensor is in the process air stream and is therefore susceptible to contamination.

Dewpoint sensor life is dependent on:

„Air temperature and flow passing over the sensor.

„The amount of fines [dust] in the process air.

„The amount of plasticizer vapor in the process air.

The dryer operator should monitor the initial dewpoint sensor readings and establish a periodic replacement schedule as needed.

Caution! Do not attempt to check the continuity or resistance of a dewpoint sensor. The sensor will be destroyed.

If you suspect that the dewpoint readings on the dewpoint meter are incorrect, a dewpoint simulation calibrator is available from the manufacturer. This device simulates various dewpoint outputs. It can confirm proper operation of the dewpoint sensor and dewpoint system control board.

Use the following procedure to check the dewpoint sensor and dewpoint control board:

1.Remove the sensor cable from the sensor hex nut adapter.

2.Connect the cable to the plug on the rear of the simulator.

3.Turn the rotary knob on the simulator to each position and note the readings on the dewpoint meter on the dryer's control panel. The readings should correspond within a degree or two across the entire range.

4.If the readings agree, the control board is OK. Dewpoint sensor replacement is recommended. If the readings do not agree, replace the control board and run the test again to rule out the possibility of a bad sensor.

Note: Do not attempt to make any adjustments to the components on the dewpoint control board.

5. When testing is finished, re-connect the control cable to the sensor adapter.

Large Dehumidifying Dryers

Maintenance

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Contents SDA 1000-5100 Series Large Dehumidifying Dryer AP-1 Control If the Shipment is Not Complete Shipping InfoUnpacking and Inspection Event of Shipping DamageCredit 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 CycleElectrical Features Standard FeaturesAuto Start Timer Mechanical 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 Fail Safe Operation Safety Devices and InterlocksSafety Circuit Standards Safety Device Lock-OutsPage Mechanical Options Denotes availability Dimensions and Specifications Denotes availabilityDenotes availability Making Electrical Connections Mechanical InstallationUncrating the Equipment Rigging and Placing UnitDescription 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 Auto Start DEW Point SetupDew Point Setup Screen Autostart Timer ScreenSystem Menu System Setup SET Clock Hour Meters Alarm History StatusHelp Menu Help Menu ScreenLOW Level Detection Setup System Backup Service Menu Main Menu System SetupSystem Setup Screen Autostart Clock Screen Clock Menu ScreenOutput Status Hour Meter ScreenInput Status Input Status ScreenService 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 TagSales Department Service DepartmentTechnical Assistance Parts Department

882.00295.00 specifications

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