Dahua PFS3211 Schnellstart-Handbuch - Seite 12

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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.

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

must be less than 4 Ω.

Models with PoE support two power inputs: PWR1 and PWR2. You can select a backup power supply

to ensure power is continuously provided, even if one channel of power breaks down. This greatly

improves the reliability of network operations. Models without PoE only support power supplies

through 12 VDC power adapters.

To avoid personal injury, do not touch any exposed wires, terminals or areas of the device that have

dangerous voltage levels. Do not dismantle parts or plug connectors into the device during power

on.

Before connecting power, make sure that the power supply conforms to the power supply

requirements on the device label. Otherwise, it might cause device damage.

The sectional area of the power cable must be more than 0.75 mm

); ground resistance is required to be less than 4 Ω.

4 Wiring

Figure 4-1 GND port

, and the GND resistance

(maximum sectional area 2.5