2. Installation2.4 Connection terminals2.4.2 Connecting the power supplyCable protectionFor all base devices, as well as for the expansion devices, connect an (F1) circuit pro-tection device rated for at least 1 A (slow).You can use a shared circuit protection device for the base device and expansion(s).Figure 13: Connecting the power supplySystem testThe devices run a system test after the supply voltage has been switched on.The system test lasts 1 s for the base device. After this time elapses, the device willenter RUN or STOP mode depending on the specific device and configured settings.NOTICEWhen the basic devices and expansion units are switched on, theybehave like a capacitor, so that an inrush current higher than the ratedinput current is present. Take this inrush current into account whendesigning the electrical equipment by using slow fuses and suitableswitches. Never use reed relay contacts to switch the power supplyas these may burn or stick. When designing the DC power supply unit,bear the inrush current in mind.You can find the required connection specifications for your device model from the cor-responding data sheet, → Section "Technical data", page 584easyE4 11/18 MN050009 EN www.eaton.com 49
