10/05 AWB8230-1541GB
EMC compliance
31
Earthing
Connect the ground plate (mounting plate) with the protective
earth using a short cable. To achieve the best results, all
conducting components (frequency inverter, mains filter, motor
filter, line reactor) should be connected by an HF wire, and the
protective conductor should be laid in a star configuration from a
central earthing point. This produces the best results.
Ensure that the earthing measures have been correctly
implemented (a fig. 28). No other device which has to be
earthed should be connected to the earthing terminal of the
frequency inverter. If more than one frequency inverter is to be
used, the earthing cables should not form a closed loop.
All conductive components (frequency inverter, line filter, line
reactor, motor reactor, etc.) should have a large-surface
connection with the earth potential (mounting plate).
Figure 27: EMC-compliant setup
a Large-area connection of all metallic control panel components.
b Mounting surfaces of frequency inverter, RFI filter and cable screen must be free from paint.
c Connect screens of cables at frequency inverter’s output with earth potential (PES) across large surface area.
d Large-area cable screen contacts with motor.
e Large-area earth connection of all metallic parts.
PE
15
PES
PES
PES
W2
U2
V2
U1
V1
W1
PE
H
z
A
R
U
N
P
O
W
E
R
A
L
A
R
M
P
R
G
IO
P
R
G
E
N
T
E
R
a
b
c
d
e
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