30119-50 Rev. 2.2 | 23JUL2020
Page 15
Output Wiring Connection
*IMPORTANT NOTES: 4-20mA Current Loop In Presence Of Environmental Noise (VFDs, RF Transmitters etc.)
• The +24VDC Power Supply must be isolated by insuring that the -24VDC is NOT tied to earth ground
• To ensure that the power supply for 4-20mA output loop is properly isolated from the earth ground, check voltage
between earth ground and negative power supply terminal. You should see oating values, in approximate range of
4V to 8V.
• The shield for the Wiegand sensor must be connected to earth ground. Insure the shield for the sensor is not connected
to VSS.
• To locate good earth ground, measure impedance between any of the non-powered 4-20mA terminals and the chosen
ground spot. The ohmmeter should show a very low reading, lower than 1Ω.
Figure 15. Output Type 4-20mA Current Loop (Remote-mounted version) In The Presence Of
Environmental Noise (VFDs, RF Transmitters, etc.)
*IMPORTANT: SEE NOTES.
Housing Label: 1 (Figure 11)
EB420-02
Board
Wiegand
Sensor
Red to VCC
Black to IO-2
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