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F-Guard IR3 HD User Manual
Current Output (0-20mA) Wiring
The detector’s 0-20mA current output can act as both a source or a sink transmitter and
can be 3-wire or 4-wire connected.
The following drawing shows how to wire the detector to act as a current source isolated
transmitter (4-wire connection):
F
IGURE
15
–
S
OURCE
4-W
IRE
S
CHEME
The following drawing shows how to wire the detector to act as a current sink isolated
transmitter (4-wire connection):
F
IGURE
16
–
S
INK
4-W
IRE
S
CHEME
The following drawing shows how to wire the detector to act as a current source non-
isolated transmitter (3-wire connection):
Detector
1
2
3
4
24VDC
Return
Return
24VDC
Detector
1
2
3
4
Power
24VDC
Return
Return
24VDC
Controller
24VDC
Return
Detector
1
2
3
4
1
Controller
Controller
Power
