No relevant resource is found in the selected language.

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies. Read our privacy policy>Search

Reminder

To have a better experience, please upgrade your IE browser.

upgrade

S12700 Series Agile Switches Hardware Installation and Maintenance Guide

This document describes hardware installation procedures of the S12700 series switches, troubleshooting methods for common hardware faults, and switch maintenance instructions.
Rate and give feedback :
Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Environmental Requirements for an Equipment Room

Environmental Requirements for an Equipment Room

Equipment Room Environment

Dust on devices may cause electrostatic discharge and result in poor contact for connectors or metal connection points. This problem can shorten the life span of devices and cause faults.

The equipment room must be free from explosive, conductive, magnetically-permeable, and corrosive dust. Table 14-8 lists the requirement for dust concentration in the equipment room.
Table 14-8  Requirements for dust particles in the equipment room

Mechanical active material

Unit

Concentration

Dust particle

Particle /m3

≤ 3x 104

(no visible dust accumulated on a workbench in three days)

Suspending dust

mg/m3

≤0.2

Precipitable dust

mg/m2·h

≤1.5

Description

  • Dust particle diameter ≥ 5 µm
  • Suspending dust diameter ≤ 75 µm
  • 75 µm ≤ precipitable dust diameter ≤ 150 µm
Take the following measures to meet the requirements:
  • Use dustproof materials for ground, wall, and ceiling construction.
  • Use screens on the door and windows facing outside. The outer windows should be dust-proof.
  • Clean the equipment room regularly and clean the air filter monthly.
  • Wear shoe covers and ESD clothing before entering the equipment room.

Requirements for Corrosive Gases

The room should be free from dusts and corrosive gases, such as SO2, H2S, and NH3. Table 14-9 lists the requirements for the corrosive gas concentration.
Table 14-9  Requirements for corrosive gas concentration

Chemical active material

Unit

Concentration

SO2

mg/m3

≤0.30

H2S

mg/m3

≤0.10

NOx

mg/m3

≤0.50

NH3

mg/m3

≤1.00

Cl2

mg/m3

≤0.10

HCl

mg/m3

≤0.10

HF

mg/m3

≤0.01

O3

mg/m3

≤0.05

Take the following measures to meet the requirements:
  • Avoid constructing the room near a place where the corrosive gas concentration is high, such as a chemical plant.
  • Ensure the air intake vent of the room is in the prevailing upwind direction from any pollution source.
  • Place batteries in different rooms.
  • A professional service should monitor the corrosive gas conditions regularly.

Requirements for ESD Prevention

The absolute value of electrostatic voltage must be less than 1000 V.

Take the following measures to meet this requirement:
  • Train operators about ESD prevention.
  • Keep the correct humidity level in the equipment room to reduce the impact of static electricity.
  • Lay out an ESD floor in equipment rooms.
  • Wear ESD shoes and clothing before entering equipment room.
  • Use ESD tools, such as wrist straps, tweezers, and pullers.
  • Ground all conductive materials in the room, including computer terminals. Use ESD worktables.
  • Keep non-ESD materials (such as common bags, foam, and rubber) at least 30 cm (11.81 in.) away from boards and ESD-sensitive components.

Electromagnetism Requirements for the Equipment Room

All interference sources, inside or outside the equipment room, can cause equipment problems with capacitive coupling, inductive coupling, electromagnetic wave radiation, and common impedance (including grounding system) coupling. Prevent the interference using these approaches:

  • Take effective measures against electrical interference from the power supply system.
  • Do not use the working ground of the equipment as the same ground for surge protection. Separate them as far as possible.
  • Keep the equipment far away from high-power radio transmitters, radar units, and high-frequency and high-current equipment.
  • Use electromagnetic shielding if necessary.
Translation
Download
Updated: 2019-05-15

Document ID: EDOC1000069460

Views: 24981

Downloads: 802

Average rating:
This Document Applies to these Products
Related Documents
Related Version
Share
Previous Next