Home Clients Background Projects Quadrature Input Counter Board Arthur Raine Director of Engineering ISIS Electronics Ltd Unit 19, 193 Garth Road Morden, Surrey SM4 4LZ United Kingdom tel:   +44 020 8330 6387 fax: +44 020 8330 6394 email: araine@isiselectronics.com

Isis Electronics Project: Advanced Braking System The Client Twiflex Ltd specialises in the design, manufacture and supply of Advanced Braking Technology for industrial applications. The company is a major supplier of braking systems for escalators and conveyors for industrial and commercial projects throughout the UK and worldwide. The Challenge As part of its ongoing product development, to reduce accidents and industrial injuries on escalators and conveyors, and satisfy increasingly stringent health and safety requirements, both domestically and internationally, Twiflex required a new servo- controlled braking system. The new braking system has to cope with a wide variety of unpredictable loads and service conditions, while conforming to legislatively-defined standards of performance. The Isis Solution Isis is developing a non-linear servo that seeks optimum gain and is stable over the required range of loading. A dedicated micro-processor is programmed to measure velocity in real time. This value is then fed to a novel digital servo-routine that seeks the required loop gain and stopping distance via controlling the hydraulic brakes. The result is more flexible control over braking distances and decelerations that offers more predictable performance over a wide range of operating conditions. Tools Software: Circuit capture Orcad (cadence) PSD 14.0; PCB layout PADS-PCB version 4.0; Gate arrays Altera Maxplus version 10.1; AVR programming Atmel Studio version 4.0 with independent nested macro assembler; Delphi Professional version 6.0. Hardware: Atmel ICE 200 in-circuit emulators. | Home | | Clients | | Background | Project: Dual Quadrature Input Counter Board