Copley Controls Xenus R10 Manual page 73

GROUNDING & SHIELDING FOR CE
Grounding and shielding are the means of
controlling the emission of radio frequency
energy from the drive so that it does not
interfere with other electronic equipment.
The use of shielded cables to connect the
drive to motors and feedback devices is a
way of extending the chassis of the drive
out to these devices so that the conductors
carrying noise generated by the drive
are completely enclosed by a conductive
shield.
The process begins at the connector J1
of the drive. When possible, it is best to
ground the (-) HV terminal to the equipment
earth ground with as short a connection as
possible. The drives' PWM outputs produce
current pulses in the wires between drive
and power supply. By grounding the power
supply at the drive end of the cables, this
noise will not appear between earth ground
and drive circuit ground. And, using shielded
cable between drive and power supply will
provide a return path for noise produced in
the cables that might otherwise radiate to
adjacent equipment.
The shield of the motor cable should also
connect to either J1-4, or to a nearby star
ground at the chassis where the power-
supply (-) terminal connects. Connecting
the shields of the motor cable to the motor
frame completes the return path for noise
that is capacitively coupled to the motor
frame.
Next, ground the motor heatplate using
an external-tooth locking washer. This
will penetrate the anodized finish of the
heatplate (which is an electrical insulator)
and make good electrical contact with the
aluminum plate. Grounding the heatplate
in this way shortens the path from drive
to earth ground and further reduces
emissions.
Shield should also be added to the cables
from the motion controller or control
system, and from the feedback device on
the motor.
Copley Controls, 20 Dan Road, Canton, MA 02021, USA
Tech Support: E-mail: sales@copleycontrols.com, Internet: http://www.copleycontrols.com
Accelnet R20
CONTROLLER
BRUSHLESS/BRUSH MOTORS
J3
ACCELNET
Notes:
1) Shielded cables required for CE are shown in the
diagram above.
Tel: 781-828-8090
R20
RUGGEDIZED DIGITAL
SERVO DRIVE FOR
J2
J1
Fax: 781-828-6547
Page 19 of 24
RoHS
FEEDBACK
MOTOR
DC
POWER
SUPPLY