Issue
Multiple passive 4-20mA sensors needs an external power supply and connected to a Sigma controller. How can this be done?
Environment
Sigma AI
Passive 4-20mA
12v DC or 24v DC
Cause
Non-passive 4-20mA sensor have a built in power supply. A passive 4-20mA sensor requires an external power supply when connecting to a Sigma controller
Resolution
- Use a 12v or 24v dc power supply as the external power supply per sensor
- The positive side must be connected to the Sigma controller
-
The correct jumper settings (current mA) are required before connecting the external supply.