Cost of Ownership as the Central Driver in Power Pack design for the Fluid Power Industries.
|Short Description||Cost of Ownership as the Central Driver in Power Pack design for the Fluid Power Industries.|
|System requirements||Global competition forces all of us to strictly control production costs. Investments in production equipment and the ongoing cost of ownership have a major impact on production costs. Maintenance plays a significant role in cost of ownership and so maintenance friendly designs and components are key to keeping costs under control.
Some real and spurious benefits of modern equipment
With more emphasis on maintenance requirements, modern technology allows maintenance friendly power pack designs. But there are some real and some spurious benefits:
Of real benefit is the standardised design of controllers and their standardised menu structure (based on VDMA recommendation 24574) which relieves maintenance crews from having to attend to different, brand-dependent operation modes. This makes not only for easier operation, but also allows for a reduced inventory of spare parts.
Microprocessor based electronics may tempt designers to select equipment offering a wide range of functions, but here again discipline is necessary to stay with the essentials for ease of maintenance. It is good to gain additional information from a controller - but does it really help to increase the systems performance and/ or efficiency?
Of doubtful benefit is the requirement for dirt clogging indicators on filters to provide an analogue 4-20mA signal. Will such a signal help to improve maintenance or the more efficient use of the filter elements? - The answer is no, because typically, the build up of a pressure loss (whether caused by differential pressure on in-line filters or back pressure on tank top return line filters) more or less exactly follows an exponential curve. Accumulated dirt causes pressure deviations to rise only very slowly. To the operator this means that there will be almost no changes to the signal for weeks or even months. The filter indication remains ‘static’, the information has no value, but the investment for this static signal is significantly high.
Against this background the components described in this article offer the opportunity to system designers to produce more competitive solutions... Download the full article in pdf format - only 95kb )