The individual layout of print media is self-evident to print processing industry customers. Achieving the inexpensive simultaneous industrial-scale production of calendars, books, and newspapers demands intelligent machine building.
Kolbus GmbH & Co. KG, based in Rahden, in the Westphalia region of Germany, develops and manufactures for this dynamic international market. To do so, the market leader in bookbinding machines and systems, for both the hard and soft cover paper and printing industry, employs over 1000 employees.
Kolbus machines have a modular design. As such, employees working with the bookbinding systems can assemble them flexibly according to customer requirements. Furthermore, subsystems can be built and tested autonomously. The three-phase power supply network runs through the whole machine. The integrated control cabinets are built into the machines in a space-saving way. To achieve this, Kolbus needs compact power supplies, as control cabinet space is at a premium. In addition to the design aspects, a very important feature is the efficiency of the power supply unit.
Furthermore, Kolbus, as an export-oriented company, has to take into account extreme ambient temperatures in southern countries. Against this backdrop, the power supplies must also function reliably at high ambient temperatures and not generate much heat themselves.
Previously Kolbus used low-voltage transformers to provide 24 V DC in their machines. As the devices were able to supply the necessary high current, circuit breakers tripped within a few milliseconds. In recent years, the transformers have been replaced by primary-switched power supplies, which generally offer a range of other advantages. However, should a short circuit occur, these devices are often unable to deliver the necessary current to trip a standard circuit breaker.
The modular design of Kolbus systems requires a consistent range of three-phase power supplies. The QUINT POWER devices are available with 24 V operating voltage and 5, 10, 20, and 40 A. For 48 V, the product range comprises a power supply unit with 20 A output current.
The 20 A power supply unit is used, for example, in a gathering machine, which enables folded sheets from rolls or folding machines to be enclosed with only a small amount of effort, as well as individual sheets, post cards, and CDs packaged in sleeves. The QUINT POWER power supply's low installation depth permits installation within the integrated control box. In addition, QUINT POWER power supply units excel, thanks to their high efficiency (better than 94 percent) and very low power dissipation. With a temperature range from -25°C to 70°C, the power supply units are ideal for worldwide use.
Since mains supplies can be unreliable when devices are used internationally, thanks to their safe operation QUINT POWER devices excel even should a phase fail. Integrated SFB (selective fuse breaking) technology reliably and quickly trips primary-switched power supply standard circuit breakers. This means that faulty current paths are selectively switched off, the fault is isolated, and important machine elements remain operational.
Jörg Niemann, responsible for the use of electro-technical components at Kolbus, explains:
“High reliability and long service life are particularly important to us when it comes to our systems. This - among other reasons - is why we are market leaders, because we perfect every detail. Without SFB technology, power supply units are tripped thermally, or in the worst case do not trip at all. This could result in cable bundles fusing. Nothing like that has yet happened, but we don't want to risk it. Power supply reliability determines the availability of individual system components, and with it whether our complex systems function without errors.”