Parker Compumotor AT6200 Installation Manual page 37

Handling & Installing Ferrite Absorbers
Take care when handling the absorbers—they can shatter if
dropped on a hard surface. For this reason the suggested
method of installation is to use a short length of 30mm
diameter heat-shrink sleeving (see Figure 1). This gives a
degree of physical protection while the cable is being
installed. The sleeving should have a shrink ratio of at
least 2.5:1. Cable ties may be used as an alternative,
however they give no physical protection to the absorber.
Ferrite absorber
retained by
heatshrink sleeving
Figure 1a. Ferrite Sleeve
Figure 1b. Snap-on Ferrite
Figure 1c. Snap-on Ferrite Installation
P-Clip Installation Details
The function of the P-clip is to provide a 360-degree
metallic contact and thus a convenient means of ensuring a
proper R.F. ground. When dealing with EMI issues, it is
important to remember that continuity, a DC connection,
does not at all speak to the integrity of an AC (high-
frequency) connection. High-Frequency bonding typically
involves wide, flat cabling to establish a suitable system
ground. When applied properly, the P-clip has been shown
to give a reliable high-frequency contact.
When installing a P-clip (see Figure 2), install as close to
the cable end as possible, provided a suitable ground,
backplane, earth stud or bus bar is accessible, (this may
mean removing the paint from a cabinet or panel).
Remove only the outer (vinyl) jacket of the braided screen
cable (this allows the braid to continue to the cable
connector), be careful not to damage the braid. Snap the
P-clip over the exposed braid, and adjust for a tight fit.
Secure the clip to the designated ground with a machine
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screw and lock washer. The use of brass or other inert
conductive metal P-clip is recommended. Cover any
exposed bare metal with petroleum jelly to resist
corrosion.
Remove outer jacket only
P-Clip do not cut braid
Figure 2. P-Clip Installation
Clam-shell clamp
The function of the clam-shell clamp is to bond, both
physically and electrically, the high-density cable to the
system cabinet, which in turn must be reliably bonded to
Earth.
Clam-shell clamp Installation Details
1. Cut a hole in the front panel of the system cabinet
through which to pass the high density cable. See
Fig. 3 for cut-out dimensions.
2. Remove the paint from around the panel cut-out to
ensure a good Earth connection.
3. Pass the mating connector of the high-density cable
through the panel cut-out. Position the connector in
the approximate place where the Auxiliary Box will
be mounted. (If the Auxiliary Box is already mounted
in the enclosure, connect the high density cable to the
connector on the top of the box.)
4. Remove approximately 1/4 inch of the outer jacket of
the high-density cable at the point where the cable
passes through the panel cut-out. Remove only the
outer (vinyl) jacket of the braided screen cable (this
allows the braid to continue to the cable connector).
Use a razor blade or utility knife, taking care to not
cut the braid.
5. Position the two clam-shell clamp pieces around the
exposed braid of the high density cable, as shown in
Fig. 4a. Fit the center slots of the clamp pieces
around the cable, with the clamp pieces overlapping
each other, as shown in Fig. 4b. The clamp pieces
must make contact with the exposed braid of the high
density cable to ensure a good electrical connection.
6. Secure the clam-shell clamp and cable to the enclosure
using #10 nuts and bolts.
7. In harsh environments, it may be necessary to cover
any exposed bare metal with petroleum jelly to resist
corrosion.