Programmable Multi-Axis Servo Drive Power Supply Unit Operation Manual
ID no.: CA97556-001 Date: 03/2015
moog
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Electrical installation
Figure 3.3 Power Supply Unit shield connection
y
Do not strip the shield too early.
y
Shields must not be used for current carrying, such as replacing the N or PE
conductor.
y
The shielding effect can be improved by laying in metal ducts/pipes.
y
If very large cable cross-sections have to be installed, shielded single wires may
also be laid instead of shielded cables.
y
Shields must be applied on at least one side. Multi-layer application is
recommended, otherwise equipotential bonding currents may flow through
widespread systems. If long earth connections are subject to interference, they
can be made by way of coupling capacitors. This enables a high-frequency
connection to discharge interference, without transmitting the 50 Hz
component.
y
The choke bases must have good contact with the cabinet earth. The contact
area must be metallically bright, in order to make a good earth connection to
the cabinet earth.
3.2.4
Shielding
Shielding should take account of the following points:
y
Use shielded mains power, motor and signal cables as set out in Figure 3.7,
p. 30. Use a cable type with double copper braiding, with 60 - 70 %
coverage, for all shielded connections.
y
Apply the shield on both sides, across a wide area. Extending the shield to the
earthing point by a wire (pigtail) will reduce the shielding effect by as much as
90 %.
Figure 3.1 Shield connection CORRECT
Figure 3.2 Shield connection INCORRECT - do not use an extension wire to the earthing point
(pigtail)
