Electrical installation: AC input, motor and brake 53
Motor power cable shielding
It is essential that the motor cable shield is correctly bonded to a functional earth,
typically the same earthed metal backplane on which the MicroFlex e150 is mounted.
The motor power output cable carries a high frequency high current waveform to the
motor, so the cable’s shielding must be earthed to prevent the cable radiating
electromagnetic contamination into the surrounding area. Such contamination can
cause spurious errors in unrelated parts of the installation, such as low voltage
communication cables. To provide a low impedance path to earth and effective
shielding, the conductor must provide contact with a large proportion of the cable’s
circumference. The following diagram shows two possible methods.
Exposing the cable shield
1. Make a single circular cut in the cable’s outer sheath, ensuring that the cable’s
braided shield is not damaged.
2. Slide the section of outer sheath towards the end of the cable to expose an area
of braided shield. Carefully remove the excess sheath at the end of the cable.
3. Attach the metal P-clip or clamp to the exposed area of braided shield.
4. Ensure that the P-clip (or Motor Cable Management Bracket, OPT-CM-001) is
securely attached to an unpainted area of the metal backplane.
Motor
Earth
Connect motor
earth/ground
to protective
earth on top of
drive.
Unshielded
lengths should
be as short as
possible.
To earth/ground outer
shield, use 360° clamp
connected to backplane.
Optional motor
circuit contactors.
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