Installation and commissioning DATAEAGLE 3XXX X-treme
Chapter 9
– Tips and Tricks
In highly disturbed environmental conditions, which may
occur for example in industry buildings with induction
furnaces we recommend a PE free installation (see
illustration). The galvanized mounting plate cannot be
grounded due to the high voltage drop of the different
grounding points within the building. Because the radio
modem is only supplied with 9-33V DC grounding is not
necessarily requested. Only HF earth is required. If a circular
current across the screen is measured (measure with a
clamp-on ammeter) a DC isolation should be realized by
using a X capacitor 100nF /230V. The capacitor acts with low
impedance against high frequent interferences but avoids cir-
cular currents.
In this installation the mounting plate may not be
grounded through PE.
Fig. 5.2: PE-free installation
Legend
Geschirmte Profi-
busleitung
= screened
Profibus cable
Referenz Masseflä-
che! Verzinkte
Montageplatte des
Schaltschranks =
Reference ground-
ing surface!
Galvanized mount-
ing plate of the
control cabinet
Geschirmte Strom-
versorgungsleitung
=
screened power
supply cable
Schaltschrank =
Control cabinet
Steuerung =
Controller
