Appendix E
117
Mount the filter within 2 inches (50mm) of the drive as shown in Figure 4. Ensure that there
is no paint on the mounting panel under the filter mounting lugs - it is vital that there is
large-area conductive contact between the filter and the panel.
Connect the incoming AC supply cable to the push-on or screw type terminals on the filter,
with the earth lead connected to a local earth stud, bus bar or metal back-plane. Route the
supply cable so that it runs close to the walls of the enclosure. Connect the earth terminal on
the filter case to earth.
Figure 3 shows the controller/drive system with two separate AC line filters. Another option
is to use the AC mains filter to power the AC control input.
Fit a ferrite absorber, Figure 1, over the cable before wiring the filter output terminals to the
AC input on the drive, see Figure 4. Locate the absorber as close as possible to the drive
using heat-shrink sleeving. Take the drive earth connection from the same stud that retains the
filter case earth.
Motor Connections
Standard
Compumotor
Motors
Compumotor servo motor systems ship with motors that do not incorporate the use of a
braided screen to control conducted emissions. Therefore when used in installations where the
motor cable is not within earthed conduit the entire length of travel, the standard motor cable
should not be used.
For motors with exposed cabling (not within earthed conduit), follow the guidelines below:
Removable cabling ...... Remove the motor cable from the standard motor, and replace with a
suitable cable described below, see Motor Cables.
Permanent cabling ....... Cut off cable in excess of approximately 4 inches (10 cm), and attach
a suitable cable described below, see Motor Cables.
Termination of the braid shield at the motor must be made using a 360° bond to the motor
body or mounting flange, and this may be achieved by using a suitable clamp. Many servo
motors are designed to accommodate MS style connections or an appropriate terminal gland
which can be used for this purpose, (in the case of MS style connectors, ensure that the cable
braid is in full contact with the metal MS connector body). If this is not the case, P-clip the
braid, see Figure 2, to the rear end bell of the motor housing, (on Compumotor Servo Motors
rather than securing the cable braid to the motor end bell, P-clip the braid to the conductive
motor mounting surface as shown in Figure 3). This will not only provide a good high
frequency bond, but strain relief as well.
At the drive end of the motor cable, fit a ferrite absorber over the cable before wiring to the
motor connector (it may be necessary to remove the existing connector). Locate the absorber
as close as possible to the connector using heat-shrink sleeving. Run the motor cable down to
the mounting panel, expose a short length of braiding and anchor to the panel with a P-clip.
The APEX615n Controller/Drive requires a safety earth connection to the motor (green and
yellow striped wire) - take this from the stud or bus bar. Run the safety earth lead alongside
the motor lead. Note that the motor cable should be kept away from I/O cables carrying
control signals.
Motor Cables
Braided Screen cable with at least 80% coverage should be used for after-market motor cables.
Consult the APEX User Guide for require cable gages and number of conductors.
There must be no break in the 360° coverage that the screen provides around the cable
conductors. If a connector must be used it should retain the 360° coverage, possibly by the use
of an additional metallic casing where it passes through the bulkhead of the enclosure. The
cable screen must not be connected to the cabinet at the point of entry. Its’ function is to
return high-frequency chopping current back to the drive or controller. This may require
mounting the connector on a sub-panel insulated from the main cabinet, or using a connector
having an internal screen which is insulated from the connector housing.
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