Issue
How do I configure a UNC532 Controller to accept a 0–10Vdc or 0/4–20mA analogue input?
Product Line
Satchwell BAS & SigmaEnvironment
Satchwell Sigma UNC532
Cause
The 532 Controller requires specific hardware configuration and resistor placement to correctly interpret 0–10Vdc or 0/4–20mA analogue signals. Incorrect configuration may result in inaccurate readings or non-functional inputs.
Resolution
To configure the 532 Controller for 0–10Vdc or 0/4–20mA analogue input, follow these steps:
- Configure the Input Links
The UNC532 Controller has two rows of configuration links:
-
Left-hand row:
-
Set to non-resistive by removing the link.
-
This disables the internal pull-up resistor, which is not required for voltage or current inputs.
-
-
Right-hand row:
- Set for Analogue Input (AI) by linking the middle and right-hand pins.
- This enables the input to function in analogue mode.
-
- Modify the Input with Resistors
Depending on the type of signal you are connecting, use the following resistor configurations:
-
For 0–10Vdc Input:
- No additional resistor is required.
- Ensure the signal is within the 0–10V range.
-
- For 0/4–20mA Input:
- Install a 250-ohm precision resistor across the input terminals.
- This resistor converts the current signal to a voltage (e.g., 4–20mA becomes 1–5V across 250 ohms).
