4 Wiring
4.1 Connecting GND Cable
Background Information
Device GND connection helps ensure device lightning protection and anti-interference. You should
connect the GND cable before powering on the device, and power off the device before
disconnecting the GND cable. There is a GND screw on the device cover board for the GND cable. It
is called enclosure GND.
Figure 4-1 GND port
Procedure
Step 1
Remove the GND screw from the enclosure GND with a cross screwdriver.
Step 2
Connect one end of the GND cable to the cold-pressed terminal, and attach it to the
enclosure GND with the GND screw.
Step 3
Connect the other end of the GND cable to the ground.
The sectional area of the GND cable must be more than 2.5 mm
2
, and the GND resistance
must be less than 4 Ω.
4.2 Connecting Power Cord
Prerequisites
The switch has connected GND cable.
Background Information
The power cord is connected to the power terminal, and provides power supply for the device. The
device supports redundant power input of two channels: PWR2 and PWR1. When one channel of
power breaks down, the other channel can continue to work, which improves network reliability.
To avoid personal injury, do not touch the bare wire, terminal, or the areas marked with danger
voltage on the device. Do not disassemble the component or plug the connector during power up.
Make sure the power supply is in accordance with the power supply requirement marked on the
device before connecting power to avoid damaging the device.
Quick Start Guide
8
Summary of Contents for HS4408-4ET-96
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