Check the P (Proportional) and I (Integral) settings. If P is too high, the controller acts too cautiously.
Safety first: always ensure the power is off before wiring. According to the standard Fourtech manual, the back terminals are typically grouped as follows:
Use the key to cycle through codes like Sn (Sensor Type), AL1 (Alarm 1), and P (Proportional Band). fourtech temperature controller manual
The "AT" light on the faceplate will blink. The controller will now "learn" the thermal dynamics of your machine.
The measured temperature is below the range of the sensor or the sensor is disconnected. Troubleshooting Tips Check the P (Proportional) and I (Integral) settings
Terminals for AC85-265V or DC24V depending on your model.
Before diving into the settings, familiarize yourself with the interface. Most Fourtech models feature: Displays the current temperature. SV (Set Value): Displays your desired target temperature. According to the standard Fourtech manual, the back
Verify the Hy (Hysteresis) or AL settings to ensure the alarm threshold isn't set too close to your working temperature.
Where you connect your SSR (Solid State Relay) or Magnetic Contactor. 3. Setting the Temperature (SV) Setting your target is the most common task: Press the SET key briefly. The SV display will flash.
If your temperature is "overshooting" (going too high) or "hunting" (oscillating around the target), you need to run . Navigate to the AT parameter in the menu. Change the value from oFF to on .