Optex Fiber SenSys Terrain Defender TD 100 Installation Manual page 17

Ground Rod/Plate
Ground Rod/Plate
Centered between SUMA
Power is provided to the sensor cables at the SUM. For Fail-Safe operation, DC power is
supplied independently to the TX and RX cables. Each processor collects its power over the
lead-in cables with a diode "OR" arrangement so that one can withstand either an open or
shorted sensor cable failure.
Color-coded cable ends
Page 17
TD24/48PSU
TD100
(24 or 48VDC)
SUM
SUM
Figure 11. System grounding
Figure 12. TX and RX Lead-In Cables
10Ω Earth to
Ground resistance
SUMA
SUM
SUMA
SUM
Heat shrink secured ferrite beads
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