DCN DCRS-9800 Series, Инструкция по установке

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DCRS-9800 InstallManual Chapter 2 Hardware Installation
2-2
resistance degradation or even electric leakage, degradation of mechanical properties
and corrosion of internal components. Extreme low relative humidity may cause the
insulation spacer to contract, making the fastening screw insecure. Furthermore, in dry
environments, static electricity is liable to be produced and cause harm to internal circuits.
Temperature extremes can cause reduced reliability and premature aging of insulation
materials, thus reducing the switch’s working lifespan. The recommended temperature
and humidity are shown below:
Temperature: Relative humidity
Long term condition Short term condition Long term condition Short term
condition
15 ~ 30°C 0 ~ 40°C
40
～
65% 10
～
90%
A sample of ambient temperature and humidity should be taken at 1.5m above the
floor and 0.4m in front of the switch rack, with no protective panel covering the front and
rear of the rack.
Short term working conditions refer to a maximum of 48 hours of continued operation
and an annual cumulative total of less than 15 days.
Formidable operation conditions refers to the ambient temperature and relative
humidity value that may occur during an air-conditioning system failure, and normal
operation conditions should be recovered within 5 hours.
2.1.3 Dust and Particles
Dust is harmful to the safe operation of the DCRS-9800 series. Dust can lead to
electrostatic adherence, especially likely under low relative humidity, causing poor contact
of metal connectors or contacts. Electrostatic adherence will result in not only reduced
product lifespan, but also increased chance of communication failures. The recommended
values for dust content and particle diameter in the site are shown below:
Max. Diameter (µm) 0.5 1 3 5
Max. Density
(particles/m³)
1.4×107 7×105 2.4×105 1.3×105
In addition, salt, acid and sulfide in the air are also harmful to the switch. Such
Notice