00196044-05 - sg x und x4i fse_en - 第47页
Operational Safety Handling ESD Modules ESD Guidelines S tudent Guide (FSE) SIPL ACE X Series and X4I Edition 01/2009 EN Operational Safety 47 2.5 ESD Guidelines 2.5.1 Handling ESD Modules Do not touch e lectronic module…
Operational Safety
Safety Features Safety and Signaling Circuit
Student Guide (FSE) SIPLACE X Series and X4I
Operational Safety Edition 01/2009 EN
46
2.4.3.2 Safety Loops
2-20: Safety Loops
Operational Safety
Handling ESD Modules ESD Guidelines
Student Guide (FSE) SIPLACE X Series and X4I
Edition 01/2009 EN Operational Safety
47
2.5 ESD Guidelines
2.5.1 Handling ESD Modules
Do not touch electronic modules unless it is absolutely essential to do so in order to carry out other work.
If it is necessary, make sure that you do not touch the pins or printed conductors when you pick up flat
modules.
Do not touch components unless
you are constantly earthed by an ESD wrist strap or
you are wearing ESD shoes or ESD shoe earthing strips on an ESD floor.
Always discharge yourself before you touch an electronic module. To do this, simply touch a conductive
and earthed object immediately before you touch the module (such as unpainted parts of a switch
cabinet, a water pipe, etc.).
Do not allow modules with chargeable and highly insulating materials to touch one another, e.g. plastic
films, insulating table surfaces or items of clothing made from synthetic fibers.
Always place the modules on a conductive surface (table with an ESD coating, conductive ESD foam,
ESD bag or container).
Do not bring modules near visual display units, monitors or televisions. Keep them at least 10 cm away
from the screen.
2.5.2 Measurements and Modifications to ESD Modules
Measurements of the assemblies may only be taken if
The measuring device has been grounded (e.g. via protective conductor) or
The measuring head of the potential-free measuring device has been briefly discharged before
measurement (e.g. touching blank metal control unit housing).
X Always use an earthed soldering iron if you carry out any soldering work.
2.5.3 Dispatching ESD Modules
X Always store modules and components in conductive packaging (e.g. metallized plastic bags or
metal sleeves) and dispatch them in conductive packaging.
X If the packaging is not conductive, place the modules in a conductive envelope before packaging.
Use conductive expanded rubber, ESD bags, domestic aluminum foil or paper, for example. NEVER
use plastic bags or film.
X If the module has integral batteries, ensure that the conductive packaging does not touch or short-
circuit the battery terminals and, if necessary, first cover the terminals with insulating tape or
material.
Operational Safety
ESD Guidelines Dispatching ESD Modules
Student Guide (FSE) SIPLACE X Series and X4I
Operational Safety Edition 01/2009 EN
48