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Charlotte Stonestreet
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ARTICLE
Maximum safety, minimum cost
15 August 2015
To achieve the maximum safety performance level PLe, a category 3 or 4 architecture must be used. This means that for a servo system a second method for measuring speed is required; this is usually achieved by fitting an additional separate encoder or resolver to the axis increasing the costs and complexity of the system and set up process.

Thanks to its onboard safety card, the PMC Protego DS from Pilz is able to measure the motor current to determine its speed. This, combined with the feedback signal provided by any servo motor, constitutes a category 4 architecture.
This means that using the PMC Protego DS drive and any servo motor it is possible to achieve PLe without any additional equipment.
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