01/2007
4.2 ESD measures
4-106
© Siemens AG 2007 All Rights Reserved
SINUMERIK 840Di sl Manual (HBIsl) – 01/2007 Edition
4.2 ESD measures
Notice
Handling of modules containing devices sensitive to electrostatic discharge:
S When handling electrostatically sensitive devices, make sure that operator,
workplace and packing material are properly grounded.
S As a general principle, electronic modules should only be touched if this is
absolutely unavoidable (owing to repair work, etc.). When you are handling
PCBs, therefore, make sure that you never touch any submodule pins or
conducting paths.
S Touch components only if
– you are permanently grounded by means of an antistatic chain,
– you are wearing ESD boots or ESD boots with grounding strips in
conjunction with ESD flooring.
S Modules may be placed only on electrically conductive surfaces (table with
ESD top, conductive ESD foam plastic, ESD packing bags, ESD transport
containers).
Notice
Exceptions to this are modules with their own power source (e.g. battery).
These may not be placed on conductive surfaces, as this might result in
short circuits and thus destroy the component on the module.
S Keep modules away from visual display units, monitors or TV sets
(minimum distance from screen > 10 cm).
S Do not bring ESD–sensitive modules into contact with chargeable and
highly–insulating materials, such as plastic sheets, insulating table tops or
clothing made of synthetic materials.
S Measurements on modules are allowed only if
– the measuring instrument is grounded (e.g. via PE conductor) or
– the measuring head on an isolated instrument is discharged briefly (e.g.
by being brought into contact with bare metal part of control housing)
before the measurement is taken.
J
4 EMC and ESD Measures
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