Power Requirements; System Grounding Requirements; Safety Ground; Lightning Ground - D-Link DES-7200 Hardware Installation Manual

DES-7200 Hardware Installation Guide
Apart from dust, the salt, acid and sulfide in the air in the equipment room must also meet
strict requirements, as such poisonous substances may accelerate the corrosion of the
metal and the aging of some parts. The equipment room should be protected from the
intrusion of harmful gases (for example, sulfur dioxide, sulfured hydrogen, nitrogen dioxide,
and chlorine), whose requirements are listed in Table 2-3.
Table 2-3 Requirements for Harmful Gases in the Equipment Room
Gas
Sulfur dioxide
Sulfured hydrogen
Nitrogen dioxide
Ammonia
Chlorine
2.2.5

Power Requirements

When the DES-7210/7206 uses the AC power supply:
AC input voltage: 90Vac~264Vac, 47Hz~63Hz
Power: 1200W/2000W
When the DES-7210/7206 uses the DC power supply:
DC input voltage: DC - 36Vdc ~ -75Vdc
Power: 1200W/2000W
Note
2.3

System Grounding Requirements

A good grounding system is the basis for the stable and reliable operation of the
DES-7210/7206. It is the chief condition to prevent lightning stroke and resist interference.
Please carefully check the grounding conditions on the installation site according to the
grounding requirements, and perform grounding properly as needed.
2.3.1

Safety Ground

The equipment using AC power supply must be grounded by using the yellow/green safety
grounding cable. Otherwise, when the insulating resistance decreases the power supply and
the enclosure in the equipment, electric shock may occur.
2.3.2

Lightning Ground

The lightning protection system of the facility is a separate system that consists of the
lightning rod, downlead conductor and the connector to the grounding system, which usually
shares the power reference ground and yellow/green safety cable ground. The lightning
discharge ground is for the facility only, irrelevant to the equipment.
Average (mg/m
0.2
0.006
0.04
0.05
0.01
The DES-7210/7206 provides 1+1 redundancy of power supply. You are
recommended to use multiple power supplies for the equipment to ensure
its continuous and stable working by avoiding the impact of unexpected
power failures on the equipment. However, you must note that the
redundancy power supplies must be of the same type; a mix of power
supplies is not allowed.
3
) Maximum (mg/m
1.5
0.03
0.15
0.15
0.3
3
)
2-7