Installation
10/05 AWB8230-1541GB
30
On the mains side, connect the RFI filter through the filter’s screw
terminals. Connect the filter’s output lines inside the frequency
inverter’s power section after removing the terminal shroud.
Radio interference filters produce leakage currents which, in the
event of a fault (phase failure, load unbalance), can be larger than
the rated values. The filters must be earthed before use in order to
avoid dangerous voltages. As the leakage currents are high
frequency interference sources, the earthing measures must be
undertaken with low resistance's on surfaces which as large as
possible.
With leakage currents f 3.5 mA, the VDE 0160 and EN 60335
stipulate that either:
• the protective conductor must have a cross-section f 10 mm
2
,
or
• the protective conductor is monitored to ensure continuity, or
• an additional protective conductor is also installed.
For DF51 frequency inverters, use the assigned DE51-LZ... filters.
EMC measures in the control panel
EMC compliance should already be ensured in the engineering
phase: making changes during installation invariably results in
higher costs.
To ensure an EMC
-compliant setup, connect all metallic
components of the devices and of the control cabinet with each
other using a large cross-section conductor with good HF
conducting properties. Do not make connections to painted
surfaces (Eloxal, yellow chromated). Connect mounting plates to
each other, and the cabinet doors with the cabinet using contacts
with large surface areas and short HF wires.
An overview or all EMC measures can be seen in the following
figure.
Fit additional RFI filters or mains filters and frequency inverters as
closely as possible to each other and on a single metal plate
(mounting plate).
Lay cables in the control cabinet as near as possible to the ground
potential. Cables that hang freely act as antennas.
To prevent transfer of electromagnetic energy, lay interference-
suppressed cables (for example mains supply before the filter) and
signal lines as far away as possible (at least 10 cm) from
HF-conducting cables (for example mains supply cable after a
filter, motor power cable). This applies especially where cables are
routed in parallel. Never use the same cable duct for interference-
suppressed and HF cables. Where unavoidable, cables should
always cross over at right angles to each other.
Never lay control or signal cables in the same duct as power
cables. Analog signal cables (measured, reference and correction
values) must be screened.
Figure 25: Book-type mounting (on right side in the example)
Figure 26: RFI filter connection
K1: RFI filter
T1: Frequency inverter
A
RUN
PRG
Hz
PRG
ENTER
IO
POWER
ALARM
M
3h
L/L1
L2
N/L3
U
V
W
R2
S2
T2
L1
L2
L3
L1
Z1 G1
L2
L3
PE
ee
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