• • • COVER STORY • • •
However, the communication interface should not affect the core functions and high reliability of the power supply. Based on these criteria, Puls uses IO-Link technology (IEC 61131-9). IO-Link is a global, standardised
communication interface suitable for industrial use with serial bidirectional, point-to-point communication between an IO-Link device and the IO-Link Master. Simple, unshielded cables are all that is required for the wiring between an IO- Link device and the IO-Link Master. The IO-Link Master allows integration into any commonly used field bus or IIoT protocol such as PROFINET, EthernetIP, EtherCAT or OPC-UA. In this manner, the power supply can communicate directly with a PLC or an IIoT gateway via the IO-Link Master A key advantage of the IO-Link interface is the
low number of additional components required in the power supply. The MTBF (Mean Time Between Failures), a significant key figure for the evaluation of system reliability, remains virtually unchanged. FIEPOS power supplies give users access to the
following information via the IO-Link: How much output current, quality of the mains voltage, temperature and if the load on the supply is static or dynamic? This information allows users to detect abnormally high transient surges in the mains supply, which cannot only damage the power supply, but also adversely affect all other connected components. With the eFused models, it also detects via the IO-Link, which current- limited output has tripped and it is possible to reset the channels remotely. All this information can be analysed in a central
3: Four outputs – four NEC Class 2 load branches A power source with limited power may be necessary for applications installed in North America. For this reason, the maximum wattage of FIEPOS model FPT300.246-042-101 meets the NEC Class 2 requirements. Up to four load branches can be set directly on the front of the device or on the versions with integrated IO-Link interface, they can also be set remotely; see Figure 6. In the case of an overload, the current is limited
to ensure that the maximum power of 100W defined for NEC Class 2 is not exceeded. The other NEC Class 2 load branches remain unaffected by the fault on the first output. In the eFused series, the tripping current for
each individual output can be set via the buttons on the front panel of the device. A different characteristic curve applies in each case, depending on the set tripping current. If the tripping current is set to 4A, the output allows 1.25 times the nominal current (5A) for a 2 second duration and then switches off. The eFused power supplies have an integrated
selectivity function which allows prioritised protection of sensitive loads. Output 1 of the four- channel eFused device FPT300.246-042-101 has the highest priority, output 4 the lowest. Therefore, a sensitive-, safety- or system-critical load such as a PLC, is best supplied via output 1. If the overall current is exceeded, the supply switches off the outputs with the lowest priority first. Activation of the outputs is also staggered and
are switched on in 100ms increments and according to their priority.
electricalengineeringmagazine.co.uk
Condition monitoring Digitalisation has led to a high priority being placed on a constant central condition-monitoring system. Seamless networking and communication between various system components allows comprehensive analysis of their status and early detection of anomalies in the system. In this manner, preventative and cost-effective maintenance can be carried out, reducing system downtime to a minimum. Additionally, this data can also be used to see the utilisation on the current application or a to make a strategic decision such as to expand the system. In both cases, the information provided by the power supply plays a key role. The power supply is at the heart of any system and allows conclusions to be drawn about its overall operational condition. FIEPOS eFused power supplies can be easily integrated into an existing condition monitoring system, providing status data in various ways. In large-scale applications, there are often
hundreds of power supplies distributed over a wide area. In these applications, efficient preventive maintenance via a central condition- monitoring system is particularly important in order to prevent costly downtimes. With the help of this information, a technician can quickly go to the correct location, possibly preventing a fault from occurring.
IO-Link For implementation of the digital system integration of power supplies, Puls places great value on a user-friendly and flexible solution.
condition-monitoring system, allowing effective preventative maintenance and increasing the system reliability while cutting maintenance and operating costs.
Output-OK signalling contact As an alternative to the IO-Link, the eFused power supplies in the FIEPOS product family are also available with an Output-OK interface. Its functions are similar to the established DC-ok signal of an industrial power supply. If the DC voltage fails, the device reports a fault via a common signalling contact in addition to the LED display on the front panel of the device. However, the
cause of the fault can only be diagnosed by a technician on site. The channels can also only be reset on the front panel of the device. An M12 connection is provided on the underside of the power supply for the Output-OK signal, as well as for the IO-Link.
ELECTRICAL ENGINEERING • JULY/AUGUST 2022 11
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