Copley Controls Xenus R10 Series, Руководство пользователя

Страница: 17 / 30

Xenus XTL
™
3 TURNS
AROUND
TOROID
INDUCTOR
MOTOR
MAINS
REGEN
CONTROLLER
XENUS
FEEDBACK
LINE
FILTER
J1
J2
J8 J7
J3 J4
24 V
POWER
SUPPLY
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 mains connector
of the drive, J1. The ground terminal here
has a circle around it indicating that this is
the safety or “bonding” ground connection.
This should be connected with wire that is
the same gauge as that used for the mains.
In the case of a short-circuit in the drive
the function of this ground connection is to
carry the fault current to earth ground until
the safety device (fuse or circuit breakers)
disconnects the drive from the mains. This
connection ensures that the heatplate of
the drive remains at earth potential and
eliminating a shock hazard that could occur
of the chassis were allowed to float to the
potential of the mains.
While this connection keeps the heatplate
at earth potential the high frequency noise
generated by switching circuits in the drive
can radiate from the wire used for the
safety ground connection. In order to keep
the path between the heatplate and earth
as short as possible it’s also recommended
to mount the drive to the equipment panel
using external-toothed lock washers. These
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.
The heatplate also connects directly to
the frame ground terminals on the motor,
feedback, and regen connectors. note that
the ground symbols for these do not have
a circle around them which indicates that
these are for shielding and not not for
safety grounding. Motors and their feedback
devices (which are typically in the motor
case) should be grounded by mounting to
equipment that is grounded as a safety
ground. By connecting the shields for these
devices at the drive and at the device, the
connection is continuous and provides a
return path for radio-frequency energy to
the drive.
notes:
1) Shielded cables required for CE are shown in the
diagram above.
2) Line filter required for CE
3) Ferrite core required for shielded cable to regen
resistor which must be in shielded enclosure.
Copley Controls, 20 Dan Road, Canton, MA 02021, USA Tel: 781-828-8090 Fax: 781-828-6547
Tech Support: E-mail: sales@copleycontrols.com, Internet: http://www.copleycontrols.com Page 17 of 30
RoHS
DIGITAL SERVO DRIVE
for BRUSHLESS/BRUSH MOTORS
GROUnDInG & SHIELDInG FOR CE