SNR-R7204
Router Hardware Installation Manual
- 6 -
Besides the dust, the device has severe demands for the salt/acid/sulfide percentage
in the air. These vicious substances will accelerate metal’s erosion and the aging
process of some parts. Hence, vicious gases (SO
2
, H
2
S, NO
2,
and CL
2
) must be
prevented from entering the computer room. The details about the average/maximum
vicious gas ratio in the air are shown in table 2-3.
Table
2-3
Average/maximum vicious gas ratio in the air
Gas
Average ratio (mg/m)
Average ratio (mg/m)
SO
2
0.2
1.5
H
2
S
0.006
0.03
NO
2
0.04
0.15
NH
3
0.05
0.15
CL
2
0.01
0.3
2.2.4 Power Requirements
The following shows the requirements for the AC current:
Input AC voltage: 220V
±
20%
，
50Hz
±
10%
Power: 60W
2.3 Grounding Requirements for the System
The nice grounding system is a solid base for 7204 router to function reliably, and a
prima premise for thunder attack prevention and anti-jamming. Please carefully check
the grounding conditions of the installation site according to the requirements of
grounding regulations, and get the grounding well done according to actual situation.
2.4 Requirements for System Connection
2.4.1 Safe Grounding
The AC-adopted device must be grounded through the yellow-green grounding line, or
the electric shock may occur when the insulation resistance between power source
and hull gets small.
2.4.2 Thunder Grounding
The anti-thunder system is an independent system among facilities, consisting of the
lightning rod, the underground conductor and the connector for the grounding system.
The grounding system is used together with the grounding device for the yellow-green
safety grounding line. The lightning discharge grounding is just for facilities, not for
devices.
2.4.3 Electromagnetic-Compatible Grounding
The groundings which are oriented for electromagnetic compatibility include the
shielded grounding, filter grounding, noise/interruption limitation and level reference.
The grounding resistance must be less than 1
Ω
.