Feature Production machinery
Safety solutions for packaging machines
Following renewed risk assessments that led to an updated machine safety design concept for a servo- driven film wrapping machine, BVM Brunner now has the flexibility to meet customer requirements whilst also ensuring the safety of machine operators
M
achinery safety specialist Pilz is a market leader in machinery safety, includ- ing control and automa- tion products, as well as training, engineering and consultancy ser- vices. Many of these products and services are suitable for packaging machinery, from small, relatively simple machines, to larger more complex packaging lines and pal- letising stations.
One company that has benefited from Pilz’s products and services is BVM Brunner, a manufacturer of film wrapping packaging machines. Having taken an early decision to comply with EN ISO 13849-1, BVM Brunner carried out renewed machine risk assess- ments in order to update the safety concepts on its machines. Following this, the company decided to implement a new safety design for one of its machines, which incorporated safety solutions from Pilz. BVM Brunner’s latest machine, the ‘Compacta Genius Servo’, is a fully automated machine with a continuous motion, cross-sealing jaw. A safety solution was required for this machine, which would not only safeguard the operator, but also complement the flexibility and easy handling required for processing a variety of products for different customers. The Pilz Safety Calculator,
PAScal, was used to determine the required PL and SIL (Safety Integrity Level) of the safety func- tions according to EN ISO 13849- 1. The PL and SIL requirements,
Factory Equipment MARCH 2011
together with the handling requirements, were then matched with the Pilz product range within the PAScal Calculator library. The new compact configurable safety relay, PNOZmulti Mini, was selected to monitor safety func- tions. Despite its compact 45mm width, the multi Mini with its 20 safe inputs and four safe semicon- ductor outputs (to SIL 3, PL e) cov- ered all safety functions of the machine, including E-stop, light barriers and safety gates. The PC- based drag-and-drop PNOZmulti Configurator also minimised ini- tial set up and enabled individual configuration for different cus- tomers and products.
The mechanical safety gate switches were replaced with low maintenance, non-contact mag- netic safety switches, PSENmag, which offered high tolerances for set up and switching distance, a clearly visible status indicator and reduced engineering time due to plug in cables.
Machine safety components Regardless of the size and com- plexity of packaging machines, there will often be a need for other safety-related components. Pilz offers a wide range of prod- ucts, including safety switches, safety bolts, optoelectronic safety devices (light curtains), camera- based safety systems and emer- gency stop switches.
In order to maximise the pro- ductivity of packaging machines, high quality diagnostics are needed. Not only does Pilz offer a variety of operator displays that can convey relevant information to operators and maintenance engineers, but the company’s PVIS ‘intelligent diagnostics’ technology provides plain text messages with precise informa- tion on the location of the fault. Pilz Automation Technology Enter 335 T: 01536 460766
www.pilz.co.uk
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