Sterling 882.00274.00 specifications Setup Procedures, Determining the Desired Feed Rate

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3-4 Setup Procedures

This section provides the procedures necessary for configuring your additive feeder.

Configuration of your additive feeder includes determining the desired feed rate and calibrating the additive feeder. We recommend that you carry out these procedures in the order given here.

Note: Before carrying out these procedures, install all equipment as described in this section.

Determining the Desired Feed Rate

The additive feed rate is the desired amount of additive to be introduced into the process stream per hour. To determine the feed rate, follow the procedure in this section. If the desired feed rate is known, go to the calibration procedure in the next section. The charts in figures 1 and 2 provide conversion and rate charts to assist you in your calculations.

For Cyclical Processing (Injection Molding, etc.)

To set up an additive feeder for cyclical processing, you need to know shot size, recovery time, and the letdown ratio.

Cyclical Processing Equation:

Shot Size (oz)

Recovery time (sec) x Letdown (ratio or %) x 225 = Feed Rate (lbs./hr.)

Example:

Shot size = 8 ounces Recovery time = 5 seconds Letdown ratio = 20:1

8 oz./5 sec. X 1/20 = 0.08 = Desired feed rate

To convert to lbs./hr.: 0.08 oz/sec x 225 = 18 lbs./hr.

For Continuous Processing (Extrusion, etc.)

To set up an additive feeder for continuous processing, you need to know the total process throughput and the desired additive percentage or letdown ratio.

Continuous Processing Equation:

Total throughput (lbs./hr.) x percentage of additive = Feed rate

Example:

Total throughput = 100 pounds per hour

Percentage of additive = 2%

100 lbs./hr. x 0.02 = 2 lbs./hr. feed rate

Additive Feeders

Chapter 3: Installation

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Contents SF Series Additive Feeders Parts and Service Department Shipping Information Table of Contents Troubleshooting Safety How to Use This ManualSafety Symbols Used in this Manual Wear Safety Glasses and Work Gloves Responsibility General ResponsibilityOperator Responsibility RememberMaintenance Responsibility Reporting a Safety DefectFunctional Description Standard FeaturesMechanical Features Models Covered in This ManualElectrical Features Controller FeaturesOptions Accessories Safety Devices and Interlocks Safety Circuit StandardsFail Safe Operation Safety Device Lock-Outs Uncrating the Equipment InstallationSupply System Installation Rigging and Placing the Additive FeederMain Power Connection Electrical ConnectionsControl Relay Connection Setup Procedures Determining the Desired Feed Rate110 100 Calibration Procedure ProcedureEquipment Needed Examples Observed Feed RatesStarting Up the Additive Feeder Initial Start-upPre-Startup Checks Shutting Down the Additive FeederOperation SwitchesIndicator Lights Start-upTimer Module Used as a Cycle Override Safety TimerCounter Module Elapsed Time Module Regrind Feeder with Proximity Switch Dual Setpoint Control Operation 2 Component ApplicationsSet Point #2 Motor Control Bottom Low Level Extruder Tracking Installation and Setup Extruder Tracking ControlExtruder Tracking Equation Equation Desired Display SettingField Control Programming Motor RPM = 25.2 X Auger RPMProgramming Mode Viewing or Changing the ConstantProgramming for Follower Operation Exiting Programming Mode and Returning to Run Mode Viewing or Changing the Program Minimum SettingViewing or Changing the Program Maximum Setting Program Minimum SettingAdditive Feeder Control Factory Defaults Shutting Down the Additive FeederMaintenance Preventative Maintenance SchedulePhotocopy this page for your maintenance records Preventative Maintenance Material Cleanout/ChangeoverRemoving Auger Assembly Corrective MaintenanceAuger Assembly Changeover Installing Auger AssemblyMotor Brush Replacement Replacement Motor Brush Part NumbersTroubleshooting Problem Possible cause Corrective actionIntroduction Additive Feeders Troubleshooting Warranty AppendixOptional Components Technical Specifications Annex B InformationDrawings and Diagrams Additive Feeder Specifications and Overall DimensionsTypical Additive Feeder Controllers SET Point Spare Parts List Exploded Assembly Drawing Parts ListA0541292 Auger Assembly, 1/2 One Component Control Enclosure Parts Identification Two Component Control Enclosure Parts Identification Additive Feeder Safety Tags Safety Tag InformationWarranty Returns Returned Material PolicyAdditive Feeder Identification Serial Number Tag Technical AssistanceWorksheet for Charting Feed Rates Photocopy this page for your records