Sterling SDAA 25-100 specifications Determining Temperature Controller Errors or Sensor Errors

Page 52

 

Problem

 

Possible cause

 

Corrective action

 

 

 

 

 

 

 

No setting change possible on

 

The key protection switch is set

 

Set the key protection switch to

 

temperature controller.

 

to ON.

 

OFF.

 

 

 

 

Input polarity on thermo-couple

 

Properly wire the terminals.

 

 

 

is wrong or connection is wrong.

 

 

 

 

 

 

 

 

 

 

 

 

Properly set the input with the

 

 

 

Input-type setting is incorrect.

 

input-type selector rotary

 

 

 

 

 

switch.

 

 

 

 

No compensating lead wires

 

Use proper compensating lead

 

 

 

used for extension of the

 

 

 

 

 

wires and terminals.

 

 

 

thermocouple.

 

 

 

 

 

 

 

 

 

 

 

 

Use a dedicated thermocouple

 

 

 

Thermocouple and controller are

 

connector. If a connector is a

 

 

 

connected by wires other than

 

metal different from the

 

 

 

proper lead wires.

 

thermocouple and controller, a

 

Process value is abnormal or

 

 

 

temperature error may result.

 

not obtained.

 

Process thermocouple not in

 

Verify that the thermocouple is

 

 

 

 

properly installed in the inlet

 

 

 

airflow.

 

 

 

 

 

tube.

 

 

 

 

 

 

 

 

 

 

Sensor is broken or short-

 

Replace with a good sensor.

 

 

 

circuited.

 

 

 

 

 

 

 

 

 

 

The controller is influenced by

 

Separate input wires as far as

 

 

 

 

possible from the origin of the

 

 

 

noise or other induction.

 

 

 

 

 

noise.

 

 

 

 

 

 

 

 

 

 

Celsius temperatures used

 

Check Mode selector switch 6:

 

 

 

instead of Fahrenheit or vice

 

•

ON - ºF

 

 

 

versa.

 

•

OFF - ºC

 

 

 

Process value shifted because

 

Set input shift value to 0, or set

 

 

 

the input shift function is used.

 

mode selector switch 4 to OFF.

6-2 Determining Temperature Controller Errors or Sensor Errors

Using a Thermocouple

If the controller displays a temperature that is close to room temperature (70ºF/21ºC) when you short-circuit controller input terminals, the controller is normal and the sensor is probably broken, short-circuited, or incorrectly wired.

Using a Platinum Resistance Thermometer

If the controller displays a temperature of about 0.0°C (32ºF) when you insert a 100-ohm resistor between terminals A and –Bof the controller, and you short-circuit controller terminals +B and –B, the controller is normal and the sensor is probably broken, short- circuited, or incorrectly wired.

Other service problems or questions can be answered by contacting the Service Department.

Dehumidifying Dryers

Chapter 6: Troubleshooting

51 of 59

Page 51 Page 53
Image 52
Page 51 Page 53
Contents Sdaa 25-100 15-60 cfm Dehumidifying Dryers Shipping Information Table of Contents Maintenance Service Department Sales Department Contract Department How to Use This Manual SafetySafety Symbols Used in this Manual Wear Safety Glasses and Work Gloves Responsibility General ResponsibilityOperator Responsibility RememberMaintenance Responsibility Reporting a Safety DefectDehumidifying Dryers Safety Models Covered in This Manual Functional DescriptionGeneral Description Standard Features What is desiccant?Mechanical Features Electrical FeaturesController Features Safety Devices and InterlocksOptions Safety Device Lock-Outs Safety Circuit StandardsFail Safe Operation Uncrating the Equipment InstallationRigging and Placing the Dryer Machine-Mount Dryer Dimensions Floor-Mount Dryer Dimensions Suggested Lift Rigging for Cart Mounted Dryers Recommended Dryer Lifting HardwareElectrical Connections Suggested Lift Rigging for Machine Mounted DryersSetup Procedures Three-Phase ModelsChecking for Proper Blower Rotation Making Dryer/Drying Hopper Process Air ConnectionsDrying Hopper Air Trap Considerations Installing Water Lines Hose and Hose ClampOptional Aftercooler Auto-Tuning the Dryer Initial Start-upPre-Startup Checks Starting Up the DryerShutting Down the Dryer Operation Start-upIndicator Lights SwitchesController Description and Operation Lit when Control Output 1 is on. The Out1 Process Air Temperature ControllerLit when Control Output 2 is on. Not used Indicator Name Description Lights in the Operation Indicator Section whenIdentifying Temperature Controller Keys Setting the Process Air TemperatureE5CN Operating Parameters Adjustment Level Indicator Name Description Tuned prior to dryer startupEntering Operating Parameters to Select Modes ON, OFFProcess Air Dew Point Display Setting the High Dew Point AlarmOptional Setting the Redundant Safety Controller Redundant Safety Controller DisplayWatlow Operating Parameters Mode Parameter Setting range Default Manf. setting Dryer Operation Procedures Model Heating Cooling 15 cfm 30 cfm 60 cfm Page Controller Operation With Optional Alarm Horn & Reset Button Page Alarm Display Messages Auto-Tuning the Dryer Shutting Down the DryerPreventative Maintenance Schedule MaintenancePhotocopy this page for your maintenance records Preventative Maintenance Recommendations for Cleaning and Replacing FiltersServicing Process Air Filters VacuumingCleaning with Compressed Air Servicing the Dew Point MonitorCorrective Maintenance Symptoms of Worn DesiccantFirst AID Replacing Worn DesiccantConsult local disposal regulations for more information Procedures Replacing the Process HeaterProblem Possible cause Corrective action TroubleshootingIntroduction Problem Possible cause Corrective action Check resin manufacturer’s data Using a Thermocouple Determining Temperature Controller Errors or Sensor ErrorsUsing a Platinum Resistance Thermometer Warranty Warranty SpecificationsWarranty Restrictions AppendixOptional Components Warranty LiabilitiesCustomer Responsibilities Technical Specifications Annex B InformationDrawings and Diagrams Spare Parts List Aftercooler Design SpecificationsLevel 2 & 3 Spare Parts List Electrical & Mechanical Safety Tag Information Warranty ReturnsDryer Safety Tags Returned Material PolicyDryer Identification Serial Number Tag Located on back of DryerService Department Technical AssistanceParts Department Sales Department
Top Page Image Contents