Illuminates when the control output is active.
PID parameters are poorly matched, or the SSR/Relay output is stuck in the closed position.
Adjust HyS (Hysteresis) to create a dead-band buffer. This prevents your relays from switching on and off too quickly. PID Control and Auto-Tuning Best for high-precision thermal systems. To run the automatic calibration cycle: Access the configuration menu and locate the AT parameter. Change the value from oFF to on . Press to confirm. The AT light on the front panel will flash. fourtech temperature controller manual
To change the target operation temperature, follow these steps:
Happy manufacturing, and stay precise.
The manual will include a diagram (often as "Fig. 1") of the control panel. Familiarizing yourself with its components is the first step to mastery. While specific models vary slightly, you'll generally find the following:
Fourtech units are widely used in refrigeration, heating, HVAC, and industrial processes. They offer features such as: Adjustable hysteresis (temperature differential) Defrost cycle management (in refrigeration models) Sensor correction (calibration) Compressor delay protection 2. Technical Parameters & Initial Settings Illuminates when the control output is active
Check terminal connections 7 and 8. Test sensor continuity with a multimeter. Replace the sensor if it is open-circuit. Temperature Overcharging (Overshooting Target)
Adjust parameters, setpoints, and navigate menus. OP1/OP2 LED: Indicates relay output status (active). AT/Status LED: Indicates when Auto-tuning is active. 2. Basic Wiring Guide This prevents your relays from switching on and
Press the key briefly. The SV display will begin to flash.