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Related Documents
Operational Concepts
Reference Documents
Many of the components of the GIS are covered by manufacturer’s user manuals.
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WARINGWARNING Trapped keys are not a substitute for lock out/tag out. Failure to follow lock out/tag out procedures can result in death or serious injury. Refer to /wiki/spaces/DSEH/pages/2139226261. |
Trapped keys prevent unauthorized entry into hazardous areas and prevents unexpected start-up of equipment when persons are in hazardous areas.
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If the safety system was working properly prior to the loss of power and the reason for the loss of power is understood, the quickest way to restore the safety system to normal operations is to cycle the individual LICs power or perform a RUN-PROG-RUN reset by turning the keyswitch from ‘run’ to ‘program’ and back to ‘run’ (This can also be done remotely if the keyswitch is in the ‘remote’ mode).
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An inspection of all hazardous areas shall me conducted prior to resuming operations. |
Functional test of Guard Locking Switch
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The hazard access guard locking switches are designed to require power to unlock them. In the event of a power failure all guards will lock in place. If personnel are in the hazardous access area they may exit by using the emergency release mechanism installed on the inside of each door or use a monitored only exit door.
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If no personnel are inside the hazardous area but entry is required, then entry must be gained through a monitored only exit door. This requires a building key. Once inside the guard locked door may be unlocked using the emergency release mechanism.
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No special tools are needed to install, service, maintain, or operate the GIS.
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Emergency Replacement of failed trapped key
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In the event of trapped key being broken or the barrel failing there are two emergency replacement kits available. Each kit consists of a single key and two replacement barrels.
Replacing a Failed Component
Because of the various security measures in place to prevent changes to the system, specific steps must be taken prior to replacing a failed component. The replacement module will have to be configured with the IP address and Safety Network Number off-line prior to installation. Firmware revision level will be set to the same revision level of the failed component.
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