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SIL 2 VSD

Rob Eagle
Anyone know who else does Variable Speed Drives (VSD), other than the Siemens (G120), that can contribute to a SIL 2 safety function?  Even better if they have EMPHASIS certification as well.  Looking for a 7kW drive.


By the way BS EN 61800-5-2 refers to them as PDS(SR)s.


Thank you.


Rob
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    Having thought through this a bit more a standard high quality VSD would be more suitable as I need high availability rather than high safety, a 'Safe' VSD will probably reduce overall availability due to its design intent to move to a safe state on detection of the slightest error and with its greater complexity this is more likely.


    Two independent fan units, duty/standby, with a SIL 2 duty changeover controller is the current thinking.


    Thanks for you help.
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    Having thought through this a bit more a standard high quality VSD would be more suitable as I need high availability rather than high safety, a 'Safe' VSD will probably reduce overall availability due to its design intent to move to a safe state on detection of the slightest error and with its greater complexity this is more likely.


    Two independent fan units, duty/standby, with a SIL 2 duty changeover controller is the current thinking.


    Thanks for you help.
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