SPEEDGATE Installation and Maintenance Manual
Revision 1 - MAY 2023
125
TROUBLESHOOTING
The following ferrite EMI cable core installation instructions are provided
for informational purposes
only
. Consult Wallace Perimeter Security for installation requirements relevant to your project.
1. Unplug cable, located in the operator enclosure, connecting the primary and secondary controller
COM boards.
2. Twist the cable five times around the ferrite EMI cable core on both sides (i.e., one cable core at each
end). In some instances, multiple twists may be required; e.g., as many as possible.
3. Plug cable back into board.
PART
NUMBER
DIMENSIONS mm
(inches)
Typical Impedance (Z) in ohms (Ω)
Ω @ 500 KHz
Ω @ 1 MHz
Ω @ 5 MHz
# of Wire Turns
# of Wire Turns
# of Wire Turns
A
B
C
1
2
5
1
2
5
1
2
5
LFB259
128-
000
25.91
(1.020)
12.83
(0.505)
28.58
(1.125) 61
220
1446
106 420
2647
62
240
1487
EMI shielding occurs when the geometry and electromagnetic properties of coiled wire over the ferrite
core attenuate high-frequency EMI/RFI electronic noise from active components, effectively protecting
other boards or components in the vicinity from EMI contamination.
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