11 Maintenance 01.99
6FC5198-6AA60-0BP1 © Siemens AG 1999 All Rights Reserved
11-6 SINUMERIK 840C, OEM Version for Windows (BA)
Therefore, please pay attention to the following guidelines:
• Electronics modules must not be touched unless it is absolutely vital for the
work to be done.
• Before touching a module, any static in the body must be discharged. The
easiest way to do this is by touching a conductive, earthed part of the
structure (e.g. bare metal parts on the cabinet, socket earth contact)
immediately beforehand.
• Modules must not be brought into contact with materials that are good
insulators (e.g. plastic foil, insulated desk tops, clothing made from
synthetic fibres).
• Modules must be placed on conductive surfaces only.
• Modules must be plugged in or unplugged only when at zero potential.
• The power supply must be switched on before any signal voltages are
applied.
• Modules and components must always be stored and carried in conductive
packing (e.g. metalized plastic boxes).
• If the packing is not conductive, the modules must be wrapped in
conductive material prior to packing. For example, conductive foam rubber
can be used.
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