ABB Triguard SC300E Safety Manual

Also see for Triguard SC300E: User manual

Contents

ABB Triguard SC300E Safety Manual Manual pdf 32 page image

Issue 5 - September 2006 Page 32 of 655.4.2 Maintenance ActionsAny maintenance actions specified to be carried out by Operations (eg lamp test) must becarried out as specified and results logged.5.4.3 Process Trips and EventsIf during the course of normal operation a process trip or event that causes action by the safetysystems should occur, then all results must be logged and confirmation that the correct safetyaction demanded occurred should be made.Before restarting the process after an event, the plant safety supervisor must confirm that theplant is safe to be re-started.5.4.4 Maintenance Engineering StationThe TriBuild Maintenance Engineering Station should not be connected to the system duringnormal operation.5.5 System ShutdownThe Safety System would normally only be shutdown during a planned major plant maintenancecycle. During this period it is likely that both major equipment will be dismantled and serviced,and possible process and system parameters modified.If process and system parameters are to be modified, then Section 7, Maintenance andModification must be adhered to.5.5.1 Process ShutdownBefore the Triguard SC300E Safety System is shutdown the process must first be safely shutdown and the plant brought to a safe/neutral state.This would normally require that all hazardous materials are removed and the process purged.5.5.2 Triguard SC300E System ShutdownThe Triguard SC300E System Shutdown will be documented in the supplied bespokeOperations and Maintenance Manual specific to the plant.In principle, the following sequence of power down is followed: -1) Remove power to main chassis.2) Remove power to slave chassis.3) Remove power to all fail-safe outputs, final elements and field sensors.4) Turn off main panel power breakers.