FEATURE EDITOR’S CHOICE
Decentralised, cabinetfree power supplies for smart manufacturing
The demand for flexible modular systems is transforming the world of manufacturing engineering as we know it, here PULS describes how the decentralisation of system components is shaping up
D
ecentralisation can speed up the system planning process, simplify
maintenance tasks, and facilitate straightforward system expansion. More system components are being relocated directly into the field now and are required to be provided with a degree of environmental protection from IP54 to IP67. As a result, central cabinets can be made smaller than ever or else dispensed with entirely. So, what exactly is going on with the
power supply in decentralised systems and mechanical engineering? The products currently available on the market follow three different strategies:
1. NO DECENTRALISATION OF THE POWER SUPPLY The power supply is not included in the decentralisation process and remains in the central cabinets. In order to supply power to the remote peripheral devices in the field, long cable harnesses have to be installed using costly large cross- section wire to minimise losses. Additionally, the system power supply has to be oversized to compensate for the loss of performance caused by the long cables.
2. POWER SUPPLY IN A DECENTRALISED ON-SITE CABINET The power supply – together with other standard components, such as electronic fuses or switches – is taken out of the central cabinet and placed directly onto the machine in smaller, decentralised IP67 cabinets. System builders often handle the planning and assembly of these cabinets themselves.
3. CUSTOMER-SPECIFIC SOLUTION – A customer-specific, decentralised solution is developed especially for the power supply. The size and mechanics are also specifically tailored to the individual system along with the electrical specifications. Many systems integrators have already
acted after recognising the benefits of a decentralised power supply: it starts with the system planning process, which offers greater freedom. There are many
6 JULY/AUGUST 2020 | ELECTRONICS applications, such as conveyor belts or production lines,
that can be supplied with energy much more efficiently and flexibly on a decentralised basis. The power supply no longer has to be oversized, and the individual system parts can be put together on a modular basis, allowing them to be extended, maintained, and converted more quickly and effectively than ever. By making the cabinets smaller, or even doing away with them entirely, the newly gained space can also be used to expand added-value system components. The power cable lengths and cross-
sections can be reduced which, in turn, saves on the costs of copper.
PAST OBSTACLES ON THE ROAD TO A DECENTRALISED POWER SUPPLY However, the cost of implementing a decentralised power supply remains high when using the solutions that are currently available. Even straightforward, decentralised on-site cabinets, for example, often comprise more than 10 components. All of these must be purchased, stored, and ultimately combined into a system by a technician. As for developing customer-specific solutions, this is even more time-consuming, expensive, and only worthwhile in larger volumes. Until now, there has not been a decentralised standard power supply that is available to order ex stock, is easy to install, and flexible enough to offer a viable alternative in all three of the above scenarios. Relocating the power supply from the control cabinet
directly into the field provides an all-in-one power supply system for decentralised systems engineering. It is then
possible to use shorter cables and smaller cable cross-sections. This not only saves on the costs of copper, but also on the installation work for the cabling. Local on-board set-up and diagnostics make system commissioning, troubleshooting and maintenance simpler. PULS is closing this gap in the
decentralisation market with the development of its FIEPOS power supply product family. This opens up
a new world of possibilities for systems designers by providing cabinet-free planning of their systems and machines. The PULS FIEPOS range is based on 1-phase and 3-phase IP54- IP67 power supplies with 300 or 500W output power. It also features an IO- Link or output OK signal as a communication interface. The various versions are based on this platform with numerous connector configurations as well as optional safety and redundancy functions. PULS classifies the devices into the
two FIEPOS product series of Basic and eFused. The devices in the Basic series have a single output, for which the various plug connectors, such as M12- L/-T/-A, 7/8”, or the HAN-Q series, are available. The Basic version is also available with an integrated decoupling MOSFET on the output side and a soft output regulation characteristic. These two functions make the devices particularly useful for assembling reliable redundant systems outside of the cabinet and help to increase performance by establishing parallel connections. The FIEPOS eFused series comes
complete with up to four internally protected outputs. Thanks to the built- in current limit, these devices can easily be used for selective current distribution and protection. The outputs are configured and monitored via IO-Link or the practical human- machine interface located directly on the front panel of the device.
PULS
www.pulspower.com
/ ELECTRONICS
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