Electromagnetic compatibility (EMC)
Installation Manual PNOZmulti Installation Manual
1002265-EN-02
11
NOTICE
Powerful HF transmitters should only be operated at a distance of more
than 0.6 m.
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Static discharge:
Static discharge occurs where there are very high differences in potential between two
points. If the two points are brought closer together or if the potential difference is in-
creased, discharges can occur in the air gaps.
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Typical source of interference: people who are statically charged from a synthetic
carpet, for example.
3.2
Making the installation EMC-compliant
3.2.1
Connecting the earth cables
Please note:
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A conductor cross section of at least 2.5 mm
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should be used for the connection to the
central earth bar. Connections should be kept as short as possible.
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Connections to the earth bar should always be in star form.
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Connect together the 0V connections on all the 24 V power supplies and earth the 0 V
mains at a single point, or ensure that measures are in place to monitor for earth faults.
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Earthed supply voltages offer the best noise immunity.
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The connection of the 0 V supply to the central earth bar or earth fault monitor must be
in accordance with relevant national regulations (such as EN 60204-1, NFPA 79:17-7,
NEC: Article 250).
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Define a central earthing point.
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Make sure that the control system and motor are earthed correctly.
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Earth the mounting plate.
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Connections should be protected from corrosion.
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Flexible earthing straps should be used on moving earth parts (e.g. machine parts,
gates). Ensure these earthing straps are as short and wide as possible.
3.2.2
Cable routing
It is possible to differentiate between cables according to their function. The following
groups exist:
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Group 1: Data and supply lines for DC voltages below 60 V and AC voltages below 25
V
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Group 2: Data and supply lines for DC voltages from 60 V to 400 V and AC voltages
from 25 V to 400 V.
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Group 3: Supply lines above 400 V
Cabling inside buildings
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The cable groups listed above should be laid separately.
