Measures To Protect Esd-Sensitive Components - Siemens SINUMERIK FM-NC Installation And Startup Manual

4 EMC / ESD Measures
4.2

Measures to protect ESD-sensitive components

4.2 Measures to protect ESD-sensitive components
!
4-74
Important
Handling of modules at risk from ESD:
S
When electrostatic components are handled, it must be ensured that per-
sonnel, workstation and packaging 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
You may only touch components if
– you are constantly connected to earth by means of an antistatic chain
– you are wearing antistatic shoes or antistatic shoes with grounding
strips in conjunction with an antistatic floor surface.
S
Modules must always be placed on a conductive surface (table with antista-
tic covering, electrically conductive foam rubber, antistatic packaging mate-
rials, antistatic transport container).
S
Modules must not be placed near VDUs, monitors or television sets (not
closer than 10 cm from screen).
S
Modules must not be allowed to come into contact with chargeable, electri-
cally insulating materials such as plastic foil, insulating table tops or clothing
made of synthetic fibers.
S
Measurements may only be taken on modules 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.
SINUMERIK 840D Installation and Start-Up Guide (IAD) – 04.00 Edition
 Siemens AG 2000 All Rights Reserved
03.96
J