Sterling 822.00292.00 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 [part number A0549143]. 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 Large Dehumidifying Dryers With AP0 Controls Shipping Info Unpacking and InspectionEvent of Shipping Damage 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 Devices and Interlocks Safety Circuit StandardsSafety Device Lock-Outs Fail Safe OperationPage Mechanical Installation Uncrating the EquipmentRigging and Placing Unit 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 TrapSwitches Indicator LightsProcess Air Temperature Controller ControlsLit when Control Output 1 is on. The Out1 Lit when Control Output 2 is on. Not usedIndicator Name Description 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 Auto-Tuning the Dryer OperationInitial Start-up 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 Technical Specifications Aftercooler Design SpecificationsAppendix Annex B InformationDrawings and Diagrams Optional dryer dust collector Spare Parts List Level 3 Mechanical Components Dryer Identification Serial Number Tag Located on back of DryerService Department Technical AssistanceParts Department Sales Department

822.00292.00 specifications

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