2-7 Safety Devices
This section includes information on safety devices and procedures that are inherent to the
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.
2-7-1 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 SPD/SPC system; 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.
2-7-2 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
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