Siemens SINUMERIK 840D Description Of Functions page 10

ESDS instructions
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SINUMERIK 840D/SIMODRIVE 611 digital Descr. of Functions HLA Module (FBHLA) – 04.00 Edition
Components which can be destroyed by Electro Static Discharge
Components which can be destroyed by electrostatic discharge are individual
components, integrated circuits or boards which, when handled, tested or
transported, could be destroyed by electrostatic fields or electrostatic dis-
charge. These components are designated as ESDS (ElectroStatic Discharge
Sensitive Devices).
Handling ESDS boards:
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When handling components which can be destroyed by electrostatic di-
scharge, it must be ensured that personnel, the workstation and packaging
are well grounded,.
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As a general rule, electronic boards should only be touched when absolu-
tely necessary.
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You may only touch ESDS components if
– you are continuously grounded via an ESDS bracelet,
– you are wearing ESDS shoes or ESDS shoe grounding strips in con-
junction with an ESDS floor surface.
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Boards may only be placed on conductive surfaces (desk with ESDS sur-
face, conductive ESDS foam rubber, ESDS packing bag, ESDS transport
containers).
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Boards may not be brought close to data terminals, monitors or television
sets (a minimum of 10 cm should be kept between the board and the
screen).
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Boards may not be brought into contact with materials which can be char-
ged and are highly insulating,
e.g. plastic foils, insulating desktops, articles of clothing manufactured from
man-made fibers.
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Measurements may be taken on the boards only if
– the measuring equipment is grounded (e.g. via the protective conductor)
or
– in the case of floating measuring instruments, the probe is briefly dis-
charged before a measurement is taken (e.g. through contact with bare
control housing).
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Closed-loop control modules, option modules and memory submodules
may only be held by the front plate or on the board edges.
 Siemens AG 2000. All rights reserved
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