Mounting and connecting the device
3.3 Connecting the device
SIMATIC IPC677E
50 Operating Instructions, 04/2019, A5E45117996-AA
3.3.3.2 Connecting the 24 VDC power supply
Safety regulations- connecting cable
Use only AC or DC connecting cables which comply with the local safety regulations.
Otherwise, there is a risk of fire and electric shock. This can result in personal injury or
property damage.
• Ensure that the AC or DC connecting cables comply with the safety regulations of the
country in which the device is installed and bear the marks required in each case.
• Connect the protective conductor in accordance with the operating instructions.
The on/off button and on/off switch do not fully disconnect the device from the mains.
There is also a risk of fire if the device or connecting lines are damaged.
• Always fully disconnect the device from the line voltage before performing work on the
device or when the device will not be used over an extended period of time.
• For control cabinet mounting: Use an easily accessible central disconnect switch as
near as possible to the device and connect the device to a protective conductor.
• When you install the device, make sure that the power supply connector is easily
accessible.
Note
Safety extra-low voltage (SELV)
•
The device must only be connected to a 24 V DC power supply which meets the
requirements of safe extra-low voltage (SELV) according to IEC/EN/DIN EN 60950-1.
A protective conductor must also be used.
The conductors must withstand the short-circuit current of the 24 V DC power source, so
that a short-circuit will not damage the cable.
Only connect cables with a minimum cross-section of 1.3 mm
2
(AWG16) and a maximum
cross-section of 3.3 mm
2
(AWG12).
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