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Connecting
6.6 Connecting the external 24 VDC power supply
Table 6-1
Pin number
Pin 1
Pin 2
6.6
Connecting the external 24 VDC power supply
Safety extra-low voltage and measures for protecting against overvoltage
● The IE Switch X-300 is designed for operation with safety extra-low voltage (SELV). This
● The power supply unit for the IE Switch X-300 power supply must meet NEC Class 2, as
● The power of all connected power supply units must total the equivalent of an LPS (limited
● If the device is connected to a redundant power supply (two separate power supplies), both
● The signaling contact can be subjected to a maximum load of 100 mA
● Never operate the device with AC voltage or DC voltage higher than 32 V DC.
Damage to the device due to overvoltage
If IE Switches X-300 are supplied over long 24 V power supply lines or networks, measures
are necessary to prevent interference by strong electromagnetic pulses on the supply lines.
These can result, for example, due to lightning or switching of large inductive loads.
One of the tests used to attest the immunity of devices of the IE Switches X-300 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 ALD 36, order number 918 408 or comparable protective element.
Vendor: DEHN+SÖHNE GmbH+Co.KG, Postfach 1640, D‑92306 Neumarkt, Germany
48
Pin assignment of the 24 VDC signaling contact
WARNING
means that only SELV complying with IEC 60950-1 / EN60950-1 / VDE0805 can be
connected to the power supply terminals.
described by the National Electrical Code(r) (ANSI/NFPA 70).
power source).
power supplies must meet these requirements.
(safety extra low voltage (SELV), 24 V DC).
CAUTION
Assignment
F1
F2
Compact Operating Instructions, 11/2019, A5E02630810-13
SCALANCE X-300M PoE
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