Feature: Power
2. T ree outputs, three load branches T ese 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 one fails, the electric circuit is
open. All sensors and actuators connected to the faulty output are no longer supplied with power. Outputs 2 and 3 are unaff ected 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 be necessary for use in North America. For this reason, the maximum wattage of FIEPOS model FPT300.246-042-101 meets NEC (National Electrical Code) 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 case of overload, current is limited to ensure that the
maximum power of 100W required by NEC Class 2 is not exceeded. T e other load branches remain unaff ected. In the eFused series the tripping current for each individual
Figure 3: FIEPOS eFused fi eld power supplies are equipped with up to four eFuses and a communication interface
output can be set via the buttons on the front panel of the device. A diff erent characteristic curve applies in each case, depending on the tripping current set. If the tripping current is set to 4A, the output allows 1.25 times the nominal current (5A) for two seconds and then switches off . T e eFused power supplies have an integrated selectivity
function which allows prioritised protection of sensitive loads. Output one of the four-channel eFused device FPT300.246-042- 101 has the highest priority, output four the lowest. T erefore, a sensitive, safety or system-critical load such as a PLC, is best supplied via output one. If overall available current is exceeded, the supply switches off the outputs with the lowest priority fi rst. Activation of the outputs is also staggered and are switched on in 100ms increments and according to their priority.
Protected load branches Requirements can vary greatly from one application to another. For this reason, PULS has developed various circuit designs for the most common applications, with several possible confi gurations:
1. Two outputs, four load branches This configuration (Figure 4) provides up to four separate load branches with two outputs each. For this requirement PULS offers three eFused models with output power of either 300W or 500W. With these models, two separate circuits per output can be achieved, allowing sensors and actuators to be independent of each other. If one sensor load branch fails due to a fault, the other three continue normally. The communications and LED status allows maintenance to be performed quickly and efficiently. The tripped channel is reset using the pushbutton on the front of the device or alternatively, via IO-Link.
18 March 2021
www.electronicsworld.co.uk
Condition monitoring Digitalisation has led to 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 monitor utilisation on the current application or to make a strategic decision, such as to expand the system, for example. 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 oſt en hundreds of power
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