ANCA Motion AMD5x Series, Руководство пользователя

Страница: 81 / 170

Power Wiring
ANCA Motion D-000129 Rev 09 69
5
Motor Power Cable Shielding 5.6.4
Motor power cables from the AMD5x drive to the motor must have braided outer shields to minimize effects to
other equipment. The cable shield minimizes radiated electromagnetic noise which may be coupled into nearby
conductors, and the shield provides a low impedance path for common mode noise currents back to the drive via
correct shield grounding.
Figure 5-5: Common Mode Noise Current Paths in a Drive System illustrates the path of
common mode noise currents. The following guidelines must be followed.

Power cables between the Drive and motor must be shielded, and the shield grounded at both ends.

There must be no break in the shield between the motor and Drive

Use motor cables with high conductivity shields (low transfer impedance), and with shields that cover at
least 80% of the cable.

Use motor cables with dedicated PE conductor(s). Do not use the shield as a PE.
Power Cable Shield Clamping 5.6.5
The motor power cable shield returns common mode noise currents back to the Drive and the shield must be
correctly clamped to the metal gear tray as close as possible to the Drives. Failure to correctly clamp the shields
may result in the common mode noise currents finding alternative paths which may affect other electrical
equipment. The gear tray layout and correct equipotential bonding of the shield in the cabinet is a critical
component in managing EMC problems. The following guidelines must be followed:

It is preferable to use motor connectors where the shield is terminated to the connector housing, and
thus is directly bonded to the motor. If a shield terminated motor connector is not used, then the cable
shield must clamped to the earthing system close to the motor.

Select shield clamps with low impedance in the MHz range, and those which enclose the cable shield,
such as in
11.8.9 Motor Power Cable Shield Clamps .

Shield clamps may include integral (additional) mechanical strain relief.

Local strain relief for the motor power cable must be provided to support the connection of the shield
clamp.

Shield clamps must be connected to the exposed metal braid of the cable. For armature cables such as
in
11.8 Cables , clamp to existing exposed metal braid at Drive cable end. For customer supplied
armature cables, remove a sufficient amount of outer sheath close to Drive cable end. See example in
Figure 5-10. Ensure that the metal braid is not damaged in this process.

Shield clamps can be mounted directly to the gear tray, or on to a common DIN rail, or on to a common
Bus Bar.

If using painted metal gear tray, remove any paint to expose the bare metal beneath the shield clamp,
or DIN rail, or Bus Bar.

Do not connect shields to cabinet entry points. Only connect to the Drive gear tray as close as possible
to the Drives.

Do not terminate shield screens with pigtails, or PE conductors.
Figure 5-10: Example Shield clamp mounting for gear tray