Siemens SCALANCE XP208EEC, Руководство по эксплуатации

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6.4 54 VDC power supply
Notes on the power supply
WARNING
Incorrect power supply
Never operate the PoE variants of the device with AC voltage or DC voltage higher than 60 V DC.
Information on the power supply
• Make sure that among other things the external power supply unit meets the following basic
requirements:
– The output voltage (PoE voltage) is a safety extra-low voltage (SELV).
– The output voltage (PoE voltage) meets the isolation requirements according to IEEE
802.3at (in other words 1500 VAC or 2250 VDC) to ground, to touchable conductive parts
and (if they exist) other secondary voltages.
– Fuse the output voltage (PoE voltage) externally, see the section "Safety when connecting
up (Page 53)".
• Select a suitable power of the external power supply unit, so that the power supply to the
power consumers is ensured, see the section "Power over Ethernet (PoE) (Page 41)".
• For the cable supplying the power supply, use a cable with a length of max. 3 m.
• To connect the power supply, use a copper cable of category 18 AWG or a cable with a cross-
section ≥ 0.75 mm², see e.g. the section "Product overview (Page 17)".
• To connect to the power supply, the device has two M12 interfaces: A-coded, 4-pin, male.
• The power supply can be connected redundantly. Both inputs are isolated. There is no
distribution of load. The power supply unit with the higher output voltage supplies the device
alone.
• The power supply is connected over a high resistance with the enclosure to allow an
ungrounded set up. The two power inputs are non-floating.
• To connect the functional ground, use a copper cable of category 18 AWG or a cable with a
cross-section ≥ 0.75 mm².
Connecting up
6.4 54 VDC power supply
SCALANCE XP-200
62
Operating Instructions, 03/2021, C79000-G8976-C428-08