ADERTISEMENT FEATURE COVER STORY
COVER STORY ADVERTISEMENT FEATURE
Figure 4: If one sensor load branch fails due to a fault, the other three continue to be supplied with power
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
pushbutton on the front of the device or alternatively, via IO-Link.
2. THREE OUTPUTS - THREE LOAD BRANCHES These options provide up to three separate and individually-protected load branches with one power supply for several sensors and actuators with power via each load branch; see Figure 5.
If a sensor connected to output 1
fails, the electric circuit is open. All sensors and actuators connected to the faulty output are no longer supplied with power. The fault is indicated via IO-Link and the status LED on the front of the device. Outputs 2 and 3 remain unaffected by this fault, and the power to these outputs is maintained.
3: FOUR OUTPUTS - FOUR NEC CLASS 2 LOAD BRANCHES A power source with limited power may
/ ELECTRONICS Figure 3:
FIEPOS eFused field power supplies are equipped with up
to four eFuses and a communication interface or functional signal.
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.
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
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