E+C August 2018

round up

ELECTRICAL PROTECTION + SAFETY

Load pins: redundancy and safety A load pin connects force-transmitting machinery ele- ments while simultaneously enabling the measurement of the force. In addition to the general detection of static or dynamic forces by load pins, the safety that is ensured by various systems also plays an important role in the applica- tion. In safety engineering, a distinction is made between direct, indirect and indicative safety: • Direct safety ensures that, in the event of the failure of a machine, components are shut down in a manner that eliminates further danger to people and does not dam- age the equipment (redundancy, fail-safe or safe-life). • Indirect safety prevents collisions and contact with moving machine parts. • Indicative safety is indicated by signs or symbols dis- played on hazards. Safety through force measurement The role of load pins in the application of safety systems is two-fold. On one hand, the direct physical safety of people involved and, on the other hand, the failure- and hazard-free functioning of machinery. Components must not lose their functionality due to overload or material failure. Load pins and their application People who are in immediate proximity to moving loads face a significant amount of potential danger. Direct safe- ty precautions must be taken to ensure their safety. Load pins and safety electronics The combination of electronics and load pins can gen- erally be used on lifting gear to prevent danger. It pro- tects both the operating personnel and the equipment itself. As a result, the EU machinery directive 2006/42/EC can be easily implemented. This requires that machines with a maximum load capacity greater than or equal to 1 000 kg or a tipping moment greater than or equal to 40 000 Nm are equipped with devices which warn the driver and prevent a dangerous movement. This can hap- pen by exceeding the maximum load capacities, load tor- ques or tipping moments. The use of suitable systems with load pins and safety and overload electronics en- sures trouble-free operation in a wide range of industries, where the protection of people, the reliability of applica- tions and the protection of machinery are important. Enquiries:Tel. +27 (0) 11 621 0000 or email sales.za@wika.com www.wika.co.za

The ultimate tool backpack for maintenance professionals It can be very inefficient, not to mention frustrating, for maintenance professionals to have to go back and forth to the office stores to fetch additional tools. COMTEST offers the new Fluke Pack30 Professional Tool Backpack that makes it easy to organise, transport, and access all tools needed for the day. Designed specifically for an electrician; DMMs, clamps, tools, and accessories, the rugged backpack also protects tools even in the dirt- iest of work sites. For digital users, the Fluke Pack30 offers a way to carry all the necessary tools while keeping one's hands free to use cell phones and tablets. The Fluke Pack30 features: • More than 30 pockets and pouches designed to hold a broad array of tools and accessories. • Six main storage compartments for convenient organisation. • A special pocket for tablets and laptops. • Storage for safety glasses, earplugs, cell phones and valuables. • Rugged, waterproof moulded bottom to protect tools and accesso- ries from the elements. • The moulded base holds the backpack upright, keeping tools organ- ised and within easy reach. Enquiries:Tel. +27 (0) 10 595 1821 or email sales@comtest.co.za

10 Electricity + Control

AUGUST 2018