MACHINE BUILDING, FRAMEWORKS & SAFETY FEATURE
ADDING POWER TO THE MACHINE... Until now, power supplies for machines and applications have been almost
exclusively found in the control cabinet. Now, however, it is possible to move the power supply out of the control panel and onto the machine – taking advantage of having the power supply as close as possible to the load, as Murrelektronik explains
O
ver the past decade, more and more machine builders have been moving key
components into the field. By dividing the machine or system up into subsections, PLCs, controllers and I/Os can be placed closer to the equipment they manage. Creating decentralised units means they
can be assembled, tested and run individually as modular subsystems, making installation, commissioning and maintenance easier, while also supporting future expansion, modular machine design, flexible placement and even updates. When moving the power supply out of the
control panel and onto the machine there are two options available: to build in a small control panel to house IP20 power supplies; and to mount an IP67 power supply directly onto the machine, eliminating an additional enclosure on the machine.
THE CONSIDERATIONS The first thing to consider is the costs involved with these two different installation options (see image, below). In addition, heat dissipation needs to be
considered when creating a power supply installation concept. One of the main advantages when choosing a decentralised IP67 solution that
IP20 power supply $$ $$ Enclosure (panel)
IP20 power supply IP67 power supply Cabling
$
can be mounted directly on the machine is that heat dissipation is no longer a concern. Because the power supply is no longer housed in an enclosure, heat easily dissipates. This also means that the control panel for the PLC or controllers can be smaller and less expensive. Furthermore, IP67 power supply diagnostics are
shown directly on the device, taking advantage of a visible status LED. To get the same diagnostics information with an IP20 power supply, you would need to open the enclosure – which results in higher costs and reduced IP protection.
TOP FEATURES OF IP67 POWER SUPPLIES There are advantages to creating an application with on-machine power, so let’s take a look at the main benefits of a decentralised power concept. 1. IP67 power supplies eliminate the need for an enclosure panel
2. On-machine power supplies can be placed directly next to loads
3. Cabling is shorter 4. Plug-and-play installation makes cabling easier and eliminates wiring errors
IP67 power supply
5. On-machine power supplies are easier to install 6. IP67 power supplies bring the end customer added benefits in terms of diagnostics and maintenance
$$$ $ Terminal block, fuses, wiring COSTS $$$ $$ $
Install components in enclosure
Wiring inside enclosure Mount enclosure
Mount power supply on machine
$$$$ TOTALS $$
7. A decentralised power concept supports future expansion and update needs
8. An IP67 power supply streamlines machine delivery and commissioning.
$$
EXAMPLES Many leading industries are embracing decentralised IP67 power supplies, and recognising the advantages of moving the power supply onto the machine. One example is the automotive industry, where commissioning has been simplified, and the OEM can deliver machines with pre-wired subsystems. The
Emparro67 Hybrid
I/Os can also be supplied with power directly next to the load. In addition, the logistics industry is
faced with longer and longer machine lines, so is recognising the benefit of eliminating power loss and moving the power supply as close as possible to
the load, decentralising the power supply installation. If customers are already purchasing an IP20 power supply and a current monitoring system for control panels, then an IP67 power supply with integrated load monitoring might be what they are looking for.
INTRODUCING THE EMPARRO67 HYBRID POWER SUPPLY With the Emparro67 Hybrid, the load circuit monitoring has two integrated channels for 24 VDC and increased diagnostics features and runtime. It has integrated MICO functionality so sensors, actuators or the field bus modules’ current can be electronically monitored. If the actuator supply is interrupted – due to short-circuit, overload or cable break, for example – the field bus will continue to be supplied by the other channel (via the sensor and module output channel). Error messages and diagnostic information can still be sent to the PLC by means of a digital alarm contact, which can also be configured as an IO-Link port. Furthermore, an IO-Link interface provides
extensive and transparent communication. The Emparro67 Hybrid can communicate as an IO-Link device with a superior IO-Link master. In addition, it has predictive maintenance
features and provides precise information through different diagnostic information about the device status. When reaching its predicted maximum lifetime, for example, a message is sent to the PLC and the device can be replaced during the next maintenance period – helping to eliminate unplanned and expensive downtime.
Murrelektronik
www.murrelektronik.uk
DESIGN SOLUTIONS | OCTOBER 2019 13
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