Installation
6 720 642 838 (2010/03)
18
7.2
Handling circuit boards
Circuit boards with control electronics are sensitive to
discharges of static electricity (ESD – ElectroStatic
Discharge) when handled. To prevent damaging the
components, special care is therefore required when
handled.
Fig. 13
Damage is usually latent, and a circuit board can operate
impeccably during commissioning but show signs of
problems later. Charged objects may only be
problematic if they are in close proximity to the
electronics. Keep a distance of at least one metre from
expanded polystyrene, protective plastic and other
packaging, synthetic material (e.g. fleeces) and similar
before starting work.
A condition for good ESD protection is a ground-
connected bracelet when handling electronics. This
bracelet must be put on before opening the screened
metal bag/packaging or before exposing an installed
board. The bracelet must be worn until the circuit board
is enclosed in its screen packaging or closed electric
box. Replaced, returned circuit boards must be handled
in the same way.
Fig. 14
CAUTION:
Never grasp a circuit board
without wearing a ground-connected
bracelet.
6 720 614 366-24.1I
6 720 614 366-25.1I