Hardware Installation and Reference Guide Preparation before Installation
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2.2.5 Lightning Resistance
When the AC power cable is imported outdoors and directly connected to the power port of the switch,
lightning preventing wires should be adopted to prevent the switch from being hit by lightning shocks.
The lightning preventing wires can be fixed on the cabinet, work station, or the equipment room’s wall
through line buckles and screws. In applications, the AC current first enters the lightning preventing
wires and then the switch.
The lightning preventing wires are not provided and should be purchased by users as required.
For the usage of lightning preventing wires, refer to their manuals.
2.2.6 EMI
All kinds of interference, from inside or outside of the device or application system, create impacts on
the device by transmission of capacity coupling, inductance coupling and electromagnetic waves.
Electromagnetic interference can be divided into two categories by transmission types, namely i.e.
radiated interference and conducted interference.
Power, normally RF power, transmitted from a device through space to a sensor is called radiated
interference. The origin of the interference source can either be part of or a unit separated electrically
from the interfered system. Conducted interference is transmitted through magnetic wires or signal
cables from the source origin to sensors. Generally, conducted interference affects the power supply of
a device and can be controlled by a wave filter. Given that radiated interference can interrupt any signal
paths of the device, it is difficult to shield the device from such interference.
The AC power supplying system is the TN system. The single-phase three-wire socket with
protecting grounding must be used as the socket for the power supply to enable the device’s upper filter
circuit to effective filter the power interface.
The switch should be far from high-power radio transmitting stations, radar stations and high-
frequency and large-current devices.
Electromagnetic shielding methods should be applied when necessary, such as using the shielded
cable as the interface cable.
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