Hardware Installation and Reference Guide Preparing for Installation
17
Caution
● Please adopt protection grounding connections in buildings so that the device can be connected to the
protection ground.
● Check whether the AC socket is reliably connected to the protection ground of the building. If not, a
protection ground wire should be used to connect the protection ground lug of the AC socket to the
protection ground of the building.
● The cross-sectional area of the protection ground cable should be at least 0.75 mm
2
(18 AWG).
⚫ Lightning Grounding
The lightning protection system of facilities is standalone, and is composed of a lightning rod, a lower conductor,
and a connector connected to the grounding system. The grounding system is usually used for power reference
grounding and safety grounding of the cabinet. Lightning grounding is required only for facilities and is not
required for the device.
⚫ EMC Grounding
Grounding required for electromagnetic compatibility includes shielded grounding, filter grounding, noise and
interference suppression, and level reference, which contribute to the overall grounding requirements. The
grounding resistance should be smaller than 1 ohm, and the ground terminals of the cabinet should be grounded
before the running of the device.
Warning
The device is a Class A product. In a domestic environment, this product may cause radio interference in which
case the user may be required to take adequate measures. In this case, users are advised to take proper
measures against the interference.
2.2.7 Anti-interference Requirements
Various interference sources, from either outside or inside the equipment or application system, affect the device
in the conductive ways such as capacitive coupling, inductive coupling, and electromagnetic radiation. There
are two types of electromagnetic interferences: radiated interference and conducted interference, depending on
the type of the propagation path. When the energy, often RF energy, from a component arrives at a sensitive
component via the space, the energy is known as radiated interference. The interference source can be both a
part of the interfered system and a completely electrically isolated unit. Conducted interference results from the
electromagnetic wire or signal cable connection between the source and the sensitive component. The
interference is conducted from one unit to another unit through cables.
Conducted interference often affects the power supply of the equipment, but can be controlled by a filter.
Radiated interference may affect any signal path in the equipment, and is difficult to shield.
The anti-interference requirements are as follows:
⚫ Take interference prevention measures for the power supply system.
⚫ Keep the device away from the grounding equipment or lightning and grounding equipment of the power
device as much as possible.
⚫ Keep the device far away from high-frequency current devices such as high-power radio transmitting station
and radar launcher.
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