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6.3
Power supply
Notes on the power supply
Incorrect power supply
If the device is connected to a redundant power supply (two separate power supplies), both
must meet these requirements.
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 SCALANCE CM-400 IE switches
to electromagnetic interference is 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 XM-400 with suitable overvoltage protection.
Note
The extenders and pluggable transceivers are supplied with power via the basic device.
Information on the power supply
• The "L1" and "L2" LEDs indicate the current range of the power supply, see the section "LEDs
"L1" and "L2" (Page 35)".
• The power supply is connected using a 4-pin plug-in terminal block (spring-loaded terminal).
The terminal block ships with the device and can also be ordered as a spare part.
• The power supply can be connected redundantly. Both inputs are isolated. There is no
distribution of load. When a redundant power supply is used, the power supply unit with the
higher output voltage supplies the SCALANCE XM-400 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 wire up the power connector, use a copper cable of category 18-12 AWG or cable with a
cross-section of 0.75 to 2.5 mm².
SCALANCE XM-400
Operating Instructions, 03/2021, C79000-G8976-C306-10
WARNING
CAUTION
Connecting up
6.3 Power supply
57
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