Installing and connecting the device
3.3 Connecting the device
SIMATIC IPC427D
Operating Instructions, 05/2017, A5E31347215-AB
45
Connecting the power supply
Please note the following to ensure you operate the device safely and in accordance with
regulations:
Electrical shock hazard and risk of fire
Voltage exceeding SELV levels may cause fire or electrical shock. Death or serious bodily
injury can result.
• Always wire the device to a 24 VDC power supply that is compliant with SELV
requirements.
• A current source in accordance with NEC Class 2 is required in order to fulfill the
requirements according to UL 60950-1 and UL 508.
• In all other cases (IEC / EN / DIN EN 60950-1), either a current source of limited output
(LPS = Low Power Source), or a line-side fuse or a line-side circuit breaker is
necessary. Current must be limited to 4.16 A. This requires a 4 A fuse max.
The device has reverse polarity protection.
● The device has been installed.
● The protective conductor is connected.
● 1 wired terminal.
The corresponding 24 V DC power supply is off.
● 1 0.5 × 3 Philips screwdriver
Insert the terminal at the marked
position.
Secure the terminal using the int
e-
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