Tom Posted January 11, 2009 Share Posted January 11, 2009 There is a news article (dated 1st Jan 2009) on the ABTT site regarding a near miss incident involving a powered hoist at the ROH. Apparently a "power failure, albeit of a control circuit, allowed the load to drop".The article includes a statement from the ROH:A potential risk has been identified in powered hoist installations where the brakes are controlled by single channel control i.e. the drive controller of an AC inverter drive.Such a configuration might cause a hoist to drop if there is a malfunction of the AC inverter drive as the signal to the brake is controlled by the inverter only. In such installations, the parameters used to actuate the brake often rely on the self-diagnostic capabilities of the inverter which are not intrinsically safe. Considering this potential risk, modern safety standards stress that safety circuits should be implemented as external redundant control systems actuating drives and brakes. The ABTT say:ABTT advises that all theatres using electrically-driven hoists, including chain hoists, which are installed for carrying loads above the heads of people be checked as a matter of urgency. The full article is here:ABTT News Article I thought it worth posting here as well. Link to comment Share on other sites More sharing options...
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