User's Manual

MR-1824 Revision E Reader Installation Sheet 15 August 2006 Page 3 of 3
Installation Sheet (Wiegand Interface) (Part No. 004-97-A)
Sentinel-Prox MR-1824 Reader
Instructions
INSTALLING FERRITE CLAMP ON POWER SUPPLY CABLE
To meet the requirements of the FCC, AWID supplies a “ferrite clamp” for installation on the power
supply wiring. The clamp can be installed by hand, easily and quickly, at the site, without removing
the reader or its wiring. This procedure may be used on a power supply that was installed earlier, or
on one being newly installed.
Three wires must pass through the ferrite’s channel when it is snapped closed – (a) the positive DC,
(b) the DC ground, and (c) the drain wire from the reader and the cable’s shield to earth-ground.
1. Locate the low-voltage DC power supply and the wires that connect it to the MR-1824 reader or
the MR-1824-MC reader.
2. Arrange for enough excess wire length so that the wires can loop through the ferrite clamp with two turns
of the wires inside the channel of the clamp.
3. Hold the open clamp (Figure 1) at a place where the three wires are accessible.
4. Loop the wires twice around the channel in the ferrite. Pull the wire loop tightly around the ferrite clamp.
5. Press the ferrite clamp around the wires until the latch at one end of the clamp snaps over the ears on the other
end of the clamp. (See Figure 2.)
FIGURE 3. Ferrite clamp (open) FIGURE 4. Ferrite clamp locked on 3 wires
Note
: If it is necessary to remove the ferrite clamp from the wires, insert a fingernail under the latch and lift it
off the ears. The clamp will then swing open.