Ground connections
Housing and Mounting Plate
By means of appropriate ground connections, it is possible to avoid the emis‐
sion of interference, because interference is discharged to ground on the
shortest possible way.
Ground connections of the metal housings of EMC-critical components (such
as filters, devices of the drive system, connection points of the cable shields,
devices with microprocessor and switching power supply units) have to be
well contacted over a large surface area. This also applies to all screw con‐
nections between mounting plate and control cabinet wall and to the mount‐
ing of a ground bus to the mounting plate. The best solution is to use a zinc-
coated mounting plate. Compared to a lacquered plate, the connections in
this area have a good long-time stability.
Connection Elements
For lacquered mounting plates, always use screw connections with tooth lock
washers and zinc-coated, tinned screws as connection elements. At the con‐
nection points, remove the lacquer so that there is safe electrical contact over
a large surface area. You achieve contact over a large surface area by
means of bare connection surfaces or several connection screws. For screw
connections, you can establish the contact to lacquered surfaces by using
tooth lock washers.
Metal Surfaces
Always use connection elements (screws, nuts, plain washers) with good
electroconductive surface.
Bare zinc-coated or tinned metal surfaces have good electroconductive prop‐
erties.
Anodized, yellow chromatized, black gunmetal finish or lacquered metal sur‐
faces have bad electroconductive properties.
Ground Wires and Shield Connec‐
tions
For connecting ground wires and shield connections, it is not the cross sec‐
tion but the size of contact surface that is important, as the high-frequency in‐
terference currents mainly flow on the surface of the conductor.
Bosch Rexroth AG DOK-RCON02-FV*********-IB08-EN-P188/259
Rexroth Frequency Converter Fv
Technical Data
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