Operation Manual ServoOne Supply Unit
31
ID no.: 1101.21B.6-00 Date:04/2020
Figure 4.3 ServoOne shield connection
y Do not strip back too far the shield.
y Shields are not allowed to be used to carry power, e.g. as a substitute for the N
or PE conductor.
y The shielding effect can be improved by laying in metal ducts/tubes.
y Shields must be connected at both ends. Additional connection at multiple
points is recommended, otherwise potential equalisation currents may ow in
physically extensive installations.
y The bases of the chokes must have good contact to the switch cabinet ground.
The contact area must be bare metal to establish a good ground connection to
the switch cabinet ground.
4.2.4 Shielding measures
You should take into account the following points for the shielding measures:
y Use only shielded mains, motor and signal cables as shown in Figure 4.7,
p.35. For all shielded connections, use cables with double copper braiding
with 60 to 70% coverage.
y Connect the shield at both ends using a large area connection. Extending the
shield to the earthing point using a wire (pigtail) reduces the shielding effect by
up to 90%.
Figure 4.1 CORRECT shield connection
Figure 4.2 INCORRECT shield connection - do not extend to the earthing point (pigtail)
Electrical installation
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