12 March 2013
This I/O solution from Beckhoff is also said to provide diagnostics and control functionality for up to eight 24 V DC branch circuits per power box.The IP67-rated EtherCAT Box I/O modules typically use M8 plug connectors for supplying power, which, according to the plug connector standard, are only suitable for a maximum amperage of 4 A. Therefore, it may not be possible to simply loop the supply through when modules have a large number of outputs. A further limitation concerns the cables – the M8 plug connectors can only be used up to a maximum cable cross-section of 0.34 mm sq. If the cables from the control cabinet to the machine are long, an excessive voltage drop can occur at higher currents. As a result, the 24 V DC voltage (±15/20%) can no longer be maintained and the modules or connected sensors/actuators may no longer work properly.The EP9214 power box is said to solve these challenges. Equipped with 7/8-in plug connectors, it maintains a total current of 16 A for each control and peripheral voltage with cable cross-sections of 1.5 and 2.5 mm sq. Even higher starting currents are briefly permissible at the outputs.
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