Installation
74 Operating instructions RHD
ELTROPLAN
-
REVCON
Elektrotechnische Anlagen GmbH
8
Installation
Appropriate design of plant and cabinet:
To avoid noise in coupling lay
a) mains/supply wires
b) motor wires of controllers / servo amplifiers
c) control- and data wires (small voltage range < 48 V) with a distance of at least 15 cm
between each other.
To obtain low resistive HF-connections, grounding, screening and other metallic connec-
tions (e. g. mounting plates, mounted units) have to be done with an as big as possible
surface to metallic ground. Use grounding and potential equalisation wires with as big
cross section as possible (min. 10mm²) or thick grounding tapes.
Use copper or tinned copper screened wires only, as steel screened wires are not suitable
for high frequency applications. Connect the screen with metal clamps or metal glands to
the equalisation bars or PE-connections. Don’t longer the screen with single wires!
If external RFI-filters are use, these have to be mounted not more than 30cm away from
the noise source and with a very good, low resistive based contact.
Inductive switching units (relay, magnetic contactor and so on) have to be equipped with
varistors, RC-circuits or suppressor diodes always.
All connections have to be as short as possible and must lay as close to the ground poten-
tial as possible, as free hovering wires act like aerials.
Avoid wire loops in all wires. Connect unused wires to ground at both ends.
If unscreened wires are used, twist the pairs to attenuate unsymmetrical noise.
