12 • vacon
installation
Tel.+358-(0)201-21
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5
4.4.2.1
Grounding the bus cable shield directly to the frequency converter frame using an RC-filter
We recommend you to do the grounding in this manner when the distance between the devices
exceeds 50 meters (55 yds.). When the distance between the devices is long disturbances (e.g. voltage
spikes) are more likely to appear. In this grounding method, the disturbances are filtered out. Even if
the ground planes of A, B and C are different (which is very typical e.g. in construction) there is no
current between them because the points do not have a ground connection.
Figure 4-11. Grounding with RC filter
1
Set jumper X1 in OFF position
Figure 4-12. Jumper X1 positions
2
Carry out the grounding in the same way as advised in Chapter 4.4.1.
C
a
n
O
p
e
n
c
a
b
l
e
c
a
b
l
e
c
a
b
l
e
A
B
C
C
a
n
p
e
n
O
C
a
n
p
e
n
O
X1
A
M
ON
OFF
1
2
3
4
5
