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What is safe torque off (STO)?

Variable-speed drives used in motor-driven applications must contain certain safety features in order to protect users and equipment whilst complying with BS EN 60204-1 – the British standard for Electrical Machinery Safety.

Safe torque off (STO) is one such feature and comes built in as standard with ABB drives. STO is used to bring a drive to a no-torque state which prevents unexpected start-up. In the case of an emergency stop, STO will cut off the drive output to the electric motor, allowing it to slow smoothly and safely to a standstill. Typical applications that benefit from STO include conveyors, mixers and grinding mills.

We’re well aware that safety is paramount in industry, and as an ABB Authorised Value Provider we can recommend suitable drives and software to help users manage risks on site. For all ABB drives enquiries please call Paul Scott on 01621 868138 or email paul@gibbonsgroup.co.uk

Variable-Speed Drives, Electric Motors

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