Proper installation begins with understanding the electrical boundaries of your device. Always disconnect the power supply before handling any electrical wiring. Terminal Configuration
This comprehensive manual provides an in-depth breakdown of how to install, program, calibrate, and troubleshoot your Fourtech temperature controller. 1. Technical Specifications and Hardware Overview
Shifts control between automatic PID mode and manual output percentage overriding.
: Most Fourtech-style controllers feature an "AT" function. When activated, the controller "learns" the thermal characteristics of your system, automatically calculating the best P, I, and D values for stability.
| Code | Name | Function | Typical Settings | | :--- | :--- | :--- | :--- | | | Alarm 1 | Sets the temperature for Alarm 1 (High/Low). | e.g., 100°C | | AL2 | Alarm 2 | Sets the temperature for Alarm 2. | e.g., 110°C | | Hy | Hysteresis | Dead band for alarm or on/off control. | 1-3 degrees | | P | Proportional Band | PID Parameter. Low P = Aggressive heating. | Default usually 10-30. | | I | Integral Time | PID Parameter. | Default usually 100-200. | | D | Derivative Time | PID Parameter. | Default usually 20-50. | | InPt / Sn | Sensor Input | Selects sensor type (K, J, Pt100). | K type is standard for most ovens. | | OutP | Output Type | Defines output signal (Relay, SSR, 4-20mA). | SSr or rEL . | | LoC | Lock | Locks the keypad to prevent changes. | 0 (Unlock), 1 (Lock Setpoint), 2 (Lock All). | fourtech temperature controller manual
Use the or Down Arrow buttons to change the flashing number to your desired target temperature.
Fourtech controllers offer two methods for controlling temperature: On/Off control and PID control. On/Off Control Mode
Instead of relying on trial-and-error, which can be time-consuming and dangerous, the technician can reference the manual to isolate the fault. For example, if a display reads "HHHH" or "EEEE," the manual clarifies whether the issue lies with a broken sensor or an internal hardware failure. This diagnostic capability minimizes downtime and reduces the operational costs associated with prolonged production halts.
Dual-line LED (Process Value in Red, Set Value in Green). Wiring Terminal Layout switch between settings
PID control (with auto-tuning) or ON/OFF control.
If your display starts flashing cryptic codes, the Instruction Manual is your best friend. Common faults include:
Small LEDs (usually labeled OUT, ALM, or AT) that show if the heater is active, if an alarm is triggered, or if "Auto-Tuning" is in progress. 2. Basic Configuration and Wiring
Used to enter the programming menu, confirm parameter changes, and toggle through settings. and save changes.
For precise temperature stability without oscillations, use PID mode. The controller calculates exactly how much energy to apply based on how close it is to the target.
: You must match the physical sensor (like a K-type or J-type thermocouple) to the settings in the manual. If you plug in a J-type but the controller thinks it's a K-type, your readings will be completely wrong. The Setup: Programming the "Brain"
Used to enter the parameter menu, switch between settings, and save changes.
Consult the of your FourTech temperature controller manual when you see a flashing message. Here are the most common codes:
Increases or decreases numerical values within parameter menus. 3. Programming and Parameter Setup
The measured temperature is below the low-end physical scale limit of the active sensor, or the sensor polarity is wired backward.