Yamatake Sdc20 User Manual Updated May 2026

Yamatake (Azbil) SDC20 is a compact, digital indicating controller designed for precise PID control of temperature and other industrial variables. While it is a legacy model, it remains widely used in various manufacturing environments for its reliability and straightforward interface. Core Functionality is a single-loop controller that utilizes PID control with "RationaLOOP"

Community Archives: A scanned version of the original DigitroniK SDC20/21 Manual is hosted on the Internet Archive. yamatake sdc20 user manual

Understanding the Structure of the SDC20 Manual

Once you have the PDF, you need to navigate it efficiently. The manual is divided into five key chapters: Yamatake (Azbil) SDC20 is a compact, digital indicating

RTD (Pt100): Connect the three wires (A, B, B') to the corresponding terminals to compensate for lead wire resistance. Control Output Unstable Temperature: If the PV jumps around, check

• S.ERR (Sensor Error): The manual indicates a break in the thermocouple or RTD. Check wiring terminals 1-4. If a TC is broken, you need HHHH display – the manual confirms this is normal behavior.
• L.ERR (Input Range Error): The PV is above or below the sensor’s range (e.g., sensor disconnected or furnace on fire). Check your SL1 setting against your actual sensor type.
• A.ERR (A/D Converter Error): Internal hardware issue. The manual lists this as a “contact your supplier” error, but also advises checking for electromagnetic interference near the unit.
• The SV Flashing: This means the controller is in “Standby” (Stop) mode. Press the R/S key for 3 seconds. The manual confirms that no control output occurs in this state.

Unstable Temperature: If the PV jumps around, check for electrical noise near the sensor wires or re-run the Auto-Tuning.