Avoiding interference
33
04/99 AWB 2700-1311 GB
Suppressor circuits for interference sources
왘 Install all suppressor circuits as close as possible
to the source of interference (contactors, relays,
valves, etc).
Screening
왘 Use only screened cables for the programming
device interface (PRG) and Suconet K interface of
the PS 4-300.
As a general rule, the lower the coupling impedance,
the better the screening effect.
Lightning protection
External lightning protection
All cables which are laid between two buildings must
be screened, ideally using metal conduits. Elements
to protect against overvoltage, such as varistors or
other types of lightning arrester, should be used for
signal cables. The cables should ideally be protected
at the point at which they enter the building, and
certainly no later than the entry to the control cabinet.
Suppressor circuits should be provided for all
switched inductances.
H1311g.bk Seite 33 Freitag, 4. Juni 1999 1:12 13
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