QSW-6200
Series Switch Hardware Installation and Reference Guide
27
www.qtech.ru
Max Dust Diameter (
μm)
0.5
1
3
5
Dust Particle (Particles/m
3
)
1.4 x 10
7 x 10
2.4 x 10
1.3 x 10
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, SO
2
, H
2
S, NO
2
and Cl
2
), whose requirements are
listed in the following table.
Gas
Average (mg/m
3
)
Maximum (mg/m
3
)
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 Grounding
A good grounding system is the basis for the stable and reliable operation of the QSW-6200 series, preventing lightning
stroke and resisting interference. Please carefully check the grounding conditions on the installation site according to the
grounding requirements, and perform grounding operations properly as required.
The correct connection of grounding lines guarantees the lighting and interference resistance of switches and must
be performed with precision.
Safety Grounding
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.
Lightning Grounding
The lightning protection system of a facility is an independent 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, but unnecessary for equipment.
EMC Grounding
The grounding required for EMC design includes shielding grounding, filter grounding, noise and interference suppression,
and level reference. All the above constitute the comprehensive grounding requirements. The grounding resistance
should be less than 1Ω. The QSW-6200 back panel has one grounding connector.
Figure 2-1 Grounding of the QSW-6200
