8 Technical description 8100_A
3.1 WIRING
3.1.1 SCREENING
The inputs and contral terminals of the device are noise immune without screening of
the connecting cables up to severity class 4 to IEC801-4.
Additional screening is required, if the device is operated where severity class 4 is
not sufficient, e.g. where power cables and control cables cannot be laid separately.
Caution: Interferences may cause faults in the program, which immediately stop
the operation via a trip fault.
SCREENING OF CONTROL CABLES
In order to avoid signal faults, we recommend to screen analog cabling, wires for
digital frequency input, and for incremental encoder feedback.
To avoid PE-Ioops, connect the screens of the contral cables at one end to PE, either
via
the provided inverter terminals or
via insulated central points, which are connected to PE at one point
(e.g. PE terminals).
via the Sub-D plug X5 (only for digital frequency input or incremental encoder
feedback).
In case of interruptions at terminal boards, relays, fuses etc. keep connections of
control cable screens as short as possible.
For screening of the control wires of the serial LECOMinterface see technical
description LECOMAlB.
SCREENINGOF MOTORCABLESAND BRAKECHOPPERCABLES
Motor cables and cables of the brake resistors are a source of electrical noise and
must be screened if sensitive equipment is close by.
Connect the screen of the motor cable directly to PE, for wires longer than 3m, both
sides, if possible.
lenze
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