H3C Technologies H3C WX5000 Series Access Controllers - Manual (Page 17)

2-2
Installation Site Checking
The WX5002V2 must be used indoors. You can mount the WX5002V2 in a cabinet or on a workbench,
but make sure that:
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Adequate clearance is reserved at the air inlet/exhaust vents for heat dissipation.
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The cabinet or workbench is in the environment that has a good ventilation system.
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The cabinet is sturdy enough to support the access controller and its accessories.
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The cabinet or workbench is well earthed.
To ensure normal operation and long service life of your access controller, install it in an environment
that meets the requirements described in the following subsections.
Requirements on Temperature and Humidity
To ensure the normal operation and service lifetime of the access controller, proper temperature and
humidity should be maintained in the equipment room.
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A long term of high humidity may lead to bad insulation, electricity leakage, mechanical property
changes, and metal components corrosion.
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If the relative humidity is too low, captive screws may become loose as a result of contraction of
insulation washers and static electricity may be produced in a dry environment to endanger the
circuits on the access controller.
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A high temperature is the most undesirable condition, because it accelerates the aging of insulation
materials and thus significantly lowers the reliability and service life of the access controller.
The following table lists temperature and humidity requirements for the WX5002V2.
Table 2-1 Operating environment
Item Description
Operating temperature 0°C to 45°C (32°F to 113°F)
Relative humidity (noncondensing) 5% to 95%
Requirements on Cleanness
Dust is a hazard to the operating safety of the access controller. The dust accumulated on the chassis
can be adsorbed by static electricity and result in poor contact of metal connectors or metal contact
points. Especially, when the relative indoor humidity is low, electrostatic adsorption is more likely to
happen. This can not only shorten the service life of the access controller but also cause
communications failures. The following table lists the dust concentration limit.
Table 2-2 Dust concentration limit in the equipment room
Physical active substance Concentration limit (particles/m
3
)
Dust ≤ 3 × 10 4 (No visible dust on the tabletop over three days)
Note: The dust particle diameter is ≥ 5 μm
Besides the dust specifications, the equipment room of the access controller also needs to strictly meet
the requirements on the concentration of salt, acid and sulfide. These harmful gases can accelerate the