ABB FENA-11 Temperature monitor module

The slide-in rack of the servo amplifier has to show a good HF contact to the mounting plate of the switch cabinet, provide for sufficient earthing of the switch cabinet. · To earth the shieldings, the metallic armored screw joints have to be used. Run them through the switch cabinet wall, with a good metallic contact to the wall.

For EMC reasons. 

the shields of one connection line must always have contact on both sides. Low-frequency circulating currents, however, may occur. These so-called hum pick-ups are, for example, created by earthing on both sides and can be eliminated by a capacitiv coupling of the shield, which consequently allows high frequency efficiency. It is useful to carry out an EMC examination for the complete system, consisting of many single components such as motor, servo amplifier, set value resolver, EMC filter, to guarantee a troublefree operation in compliance with the CE directive.

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