2 Installation2.7 Connecting the power supply34 Gateway XN-312-GW-CAN 06/16 MN050003-EN www.eaton.eu2.7 Connecting the power supplyThe gateway and the modules are powered using the X3 terminals. The gate-way uses the voltage at X3 to produce the 5-V supply voltage for the mod-ules on the system bus, with the maximum output current being 1.6 A.Moreover, the gateway uses the voltage at X3 to produce the 24-V supplyvoltage for the following system bus modules, with the maximum outputcurrent being 1.6 A:• Analog module• Technology modulesIn order for XN300 slice modules with terminals for an external power supplyto be able to perform their specified functions, they must be supplied with anexternal 24 VDC voltage.Take into account the total power consumption and the voltage drop on yoursystem bus and, if necessary, include additional XN-322-4PS-20 power sup-ply modules. You can use the XN300-Assist software program for assistancewith the corresponding calculations. In addition, the program will automati-cally let you know if additional power supply modules are required for yourdesign.Figure 21: Connection of power supply DANGERIn safety-relevant applications the power supply providingpower to the XN300 system must feature a PELV power supplyunit (protective extra low voltage). DANGERThe gateway has protection against polarity reversal for the 24 VDC POW supply. If, however, the gateway is connected to agrounded device, e.g., a computer, via the diagnostic interface,the gateway may be destroyed if the polarity of the power sup-ply is reversed!3 mm (0.12”)F1X3U e = 24 V DC(18 - 30 V DC SELV)V+V+0 V0 V0 V24 V DCUL: F1 ≦ 2 AIEC: F1 ≦ 3 AIe ≦ 2 A
