How to Use REX-100: Examples, Pinouts, and Specs

The REX-100 is a precision temperature controller designed for industrial applications. It features a digital display for real-time temperature monitoring, programmable set points for precise control, and versatile input/output options for seamless integration into a variety of control systems. This component is ideal for maintaining stable temperatures in processes such as manufacturing, chemical processing, and laboratory experiments.

• Industrial heating and cooling systems
• Laboratory temperature regulation
• Food processing and storage
• Chemical and pharmaceutical manufacturing
• HVAC systems

1. Power Connection: Connect the AC power supply to the AC L and AC N terminals. Ensure the voltage matches the specified input range (100-240V AC).
2. Sensor Connection: Attach the temperature sensor (e.g., thermocouple or RTD) to the Input+ and Input- terminals. Verify the sensor type is compatible with the REX-100.
3. Output Connection:
   • For relay output, connect the load to the Relay NO, Relay COM, and Relay NC terminals as needed.
   • For SSR output, connect the load to the SSR+ and SSR- terminals.
4. Set Parameters: Use the front panel buttons to configure the desired temperature set point and control mode (PID or ON/OFF).
5. Mounting: Secure the REX-100 in a panel cutout (48mm x 48mm) using the provided mounting brackets.

• Ensure proper grounding to avoid electrical noise or interference.
• Use shielded cables for sensor connections in noisy environments.
• Avoid exceeding the rated current and voltage for the output terminals.
• For PID control, perform auto-tuning (if available) to optimize performance.

The REX-100 can be used with an Arduino UNO to monitor and control temperature. Below is an example of how to read the temperature data from the REX-100 using a thermocouple sensor and display it on the Arduino Serial Monitor.

#include <SoftwareSerial.h>

// Define RX and TX pins for communication with the REX-100
SoftwareSerial rexSerial(10, 11); // RX = pin 10, TX = pin 11

void setup() {
  Serial.begin(9600); // Initialize Serial Monitor
  rexSerial.begin(9600); // Initialize communication with REX-100

  Serial.println("REX-100 Temperature Controller");
  Serial.println("Reading temperature data...");
}

void loop() {
  if (rexSerial.available()) {
    // Read data from REX-100
    String temperatureData = rexSerial.readStringUntil('\n');
    
    // Display the temperature data on Serial Monitor
    Serial.print("Temperature: ");
    Serial.println(temperatureData);
  }

  delay(1000); // Wait 1 second before the next reading
}

• Ensure the REX-100 is configured to output temperature data via serial communication.
• Use a level shifter if the REX-100 operates at a voltage level incompatible with the Arduino UNO.

1. No Display or Power:

   • Check the AC power supply connection to AC L and AC N.
   • Verify the input voltage is within the specified range (100-240V AC).

2. Incorrect Temperature Reading:

   • Ensure the correct sensor type (thermocouple or RTD) is selected in the settings.
   • Check for loose or incorrect sensor connections.

3. Output Not Activating:

   • Verify the load is connected to the correct output terminals (Relay or SSR).
   • Ensure the set point and control mode are configured properly.

4. PID Control Not Stable:

   • Perform auto-tuning to optimize PID parameters.
   • Check for external factors causing temperature fluctuations.

Q: Can the REX-100 handle multiple sensors simultaneously?
A: No, the REX-100 supports only one sensor input at a time. Ensure the correct sensor type is selected in the settings.

Q: How do I reset the REX-100 to factory settings?
A: Refer to the user manual for the specific reset procedure, typically involving a combination of button presses.

Q: Can I use the REX-100 with a DC power supply?
A: No, the REX-100 requires an AC power supply within the range of 100-240V AC.

Q: What is the maximum load the relay output can handle?
A: The relay output can handle up to 250V AC at 3A. For higher loads, use an external relay or contactor.

By following this documentation, users can effectively integrate the REX-100 into their temperature control systems and troubleshoot common issues with ease.