Lenze EDB9300UES - Manual (Page 88)

Transport, Installation and Connection
BA8230 83
Above that length two separate compensator cables of 16 mm² copper should be
used for reasons of EMC. The potential compensation cable should be laid so that the
surface area enclosed between the signal cable and the compensation cable is as
small as possible.
In difficult cases where additional radio interference suppression measures are
needed, twisting with the cable affected by interference is a very efficient method for
effectively suppressing malfunctions.
Fig. 40: Efficiency of screen contact for induced effects
•
When the 8230 frequency inverter is supplied by an external 24 V auxiliary voltage
this voltage may not supply several consumers in different cubicles. Ideally each
8230 frequency inverter should have power supplies of separate potential.
•
The quality of the signal cable to the encoder is a critical factor for the maximum
possible encoder frequency. Screened encoder cables with the conductors twisted
in pairs, for example LIYCY 3 x 2 x 0.75 mm² at least, should always be used. The
screen is to be connected well at both ends. Signal cables should preferably always
be connected directly at the encoder interface, with no further terminals or
separation points. Unused signal conductors are to be grounded.
•
Only signal cables with a tinned copper screen braid should be used. The braid
should provide at least 85 % cover. Cables with a foil screen are less suitable as
they are easily damaged by bending and pressure.
•
The screen is to be continuous to peripheral equipment such as demand
potentiometers etc. Only one additional interruption point is permitted. This is to be
such that less than 2 cm of the cable remain unscreened. The screens at both ends
of the cable are to be connected through the screen rail (see Fig. 43). Various
different round cable clamps are supplied with the unit for securing cable screens to
the aluminium slide-in rack in the 8230 frequency inverter. It is to be secured using
a M4 screw (see Fig. 44).
Show/Hide Bookmarks