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6.3
24 VDC power supply
Notes on the power supply
Incorrect power supply
You do not need to fuse the supply cable if you only use power sources with a limited power
source (LPS) or power sources according to NEC Class 2 for the power supply of the devices.
If the device is connected to a redundant power supply (two separate power supplies), both
must meet these requirements.
If you do not use power sources with a limited power source (LPS) or power sources according
to NEC Class 2 for the power supply of the devices, you need to fuse the power sources
externally, see the section "Safety when connecting up (Page 53)".
Never operate the device with AC voltage or DC voltage higher than 32 V DC.
Damage to the device due to overvoltage
The connector of the external power supply is not protected against strong electromagnetic
pulses that can, for example, result from lightning strikes or switching large loads.
One of the tests used to attest the immunity of devices of the IE switches SCALANCE XP-200 to
electromagnetic interference was the "surge immunity test" according to EN61000-4-5. This
test requires overvoltage protection for the power supply lines. A suitable device is, for
example, the Dehn Blitzductor BVT AVD 24, article number 918 422 or a comparable protective
element.
Manufacturer: DEHN+SOEHNE GmbH+Co.KG, Hans-Dehn-Str.1, Postfach 1640, D92306
Neumarkt, Germany
Operate the SCALANCE XP-200 with suitable overvoltage protection.
Information on the power supply
• 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 power supply, use a copper cable of category 24 AWG or a cable with a cross-
section ≥ 0.25 mm².
• To connect the functional ground, use a copper cable of category 20 AWG or a cable with a
cross-section ≥ 0.75 mm².
SCALANCE XP-200
Operating Instructions, 03/2021, C79000-G8976-C428-08
WARNING
CAUTION
Connecting up
6.3 24 VDC power supply
59
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