Sterling 882.00274.00 specifications Safety Devices and Interlocks, Safety Circuit Standards

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2-6 Safety Devices and Interlocks

This section includes information on safety devices and procedures that are inherent to the additive feeder. This manual is not intended to supersede or alter safety standards established by the user of this equipment. Instead, the material contained in this section is recommended to supplement these procedures in order to provide a safer working environment.

At the completion of this section, the operator and maintenance personnel will be able to do the following:

Identify and locate specific safety devices.

Understand the proper use of the safety devices provided.

Describe the function of the safety device.

Safety Circuit Standards

Safety circuits used in industrial systems protect the operator and maintenance personnel from dangerous energy. They also provide a means of locking out or isolating the energy for servicing equipment.

Various agencies have contributed to the establishment of safety standards that apply to the design and manufacture of automated equipment. The Occupational Safety and Health Administration (OSHA) and the Joint Industrial council (JIC) are just a few of the organizations that have joined with the plastics industry to develop safety standards.

Every effort has been made to incorporate these standards into the design of the additive feeder; however, it is the responsibility of the personnel operating and maintaining the equipment to familiarize themselves with the safety procedures and the proper use of any safety devices.

Fail Safe Operation

If a safety device or circuit should fail, the design must be such that the failure causes a “Safe” condition. As an example, a safety switch must be a normally open switch. The switch must be held closed with the device it is to protect. If the switch fails, it will go to the open condition, tripping out the safety circuit.

At no time should the safety device fail and allow the operation to continue. For example, if a safety switch is guarding a motor, and the safety switch fails, the motor should not be able to run.

Additive Feeders

Chapter 2: Functional Description

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Contents SF Series Additive Feeders Parts and Service Department Shipping Information Table of Contents Troubleshooting Safety Symbols Used in this Manual SafetyHow to Use 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 ManualOptions Electrical FeaturesController Features Accessories Fail Safe Operation Safety Devices and InterlocksSafety Circuit Standards Safety Device Lock-Outs Uncrating the Equipment InstallationSupply System Installation Rigging and Placing the Additive FeederControl Relay Connection Main Power ConnectionElectrical Connections Setup Procedures Determining the Desired Feed Rate110 100 Equipment Needed Calibration ProcedureProcedure Examples Observed Feed RatesStarting Up the Additive Feeder Initial Start-upPre-Startup Checks Shutting Down the Additive FeederOperation SwitchesIndicator Lights Start-upCounter Module Timer ModuleUsed as a Cycle Override Safety Timer Elapsed Time Module Set Point #2 Motor Control Bottom Low Level Regrind Feeder with Proximity SwitchDual Setpoint Control Operation 2 Component Applications Extruder Tracking Installation and Setup Extruder Tracking ControlExtruder Tracking Equation Equation Desired Display SettingField Control Programming Motor RPM = 25.2 X Auger RPMProgramming for Follower Operation Programming ModeViewing or Changing the Constant 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 FeederPhotocopy this page for your maintenance records MaintenancePreventative Maintenance Schedule Preventative Maintenance Material Cleanout/ChangeoverRemoving Auger Assembly Corrective MaintenanceAuger Assembly Changeover Installing Auger AssemblyMotor Brush Replacement Replacement Motor Brush Part NumbersIntroduction TroubleshootingProblem Possible cause Corrective action 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