Introduction
The CEMELI REX-C100 is a high-precision PID temperature controller designed for various industrial and scientific applications. It features a digital thermostat with a 40A Solid State Relay (SSR) output and supports K, J, and E type thermocouples. This manual provides essential information for the proper installation, operation, and maintenance of your REX-C100 controller to ensure reliable and accurate temperature control.
1. Setup and Installation
1.1 Product Overview
The REX-C100 PID Temperature Controller is designed for precise temperature management. Below is an image illustrating the main unit and a typical K-type thermocouple included in some sets.
Figure 1.1: REX-C100 PID Temperature Controller and 1M K-Type Thermocouple. The controller features a digital display for process value (PV) and set value (SV), along with control buttons. The thermocouple is a standard temperature sensor for input.
1.2 Front Panel Description
Familiarize yourself with the front panel controls and indicators for effective operation.
Figure 1.2: REX-C100 Product Panel. The top display (PV) shows the actual temperature, while the bottom display (SV) shows the set temperature. Indicators include Alarm1 (ALM1), Output1 (OUT1), Alarm2 (ALM2), and Auto-tuning (AT). Control buttons are Set, Move, Minus, and Plus.
- PV (Process Value): Displays the current measured temperature.
- SV (Set Value): Displays the desired target temperature.
- ALM1/ALM2: Alarm indicators.
- OUT1: Output indicator, showing when the control output is active.
- AT (Auto-tuning): Auto-tuning indicator.
- SET Button: Enters parameter setting mode.
- MOVE Button: Shifts the cursor during parameter setting.
- MINUS (-) Button: Decreases the value of the selected parameter.
- PLUS (+) Button: Increases the value of the selected parameter.
1.3 Side Panel Information
The side panel provides crucial information regarding default settings and input/output specifications.
Figure 1.3: REX-C100 Product Side. This view shows the model number (REX-C100FK05-V*AN), default output (12VDC SSR), default temperature range (0-400°C, adjustable to 0-999°C for K-type), default input (K-type, also J, E options), and default power supply (100-240VAC).
1.4 Terminal Connections
Proper wiring of the terminals is essential for safe and correct operation. Refer to the diagram below for terminal assignments.
Figure 1.4: REX-C100 Terminal Explaining. Terminals 1 and 2 are for 100-240VAC power supply. Terminals 3, 4, 5 are for Relay Output (Normally Open, Common, Normally Closed). Terminals 6, 7 are for Alarm. Terminals 8, 9, 10 are for Thermocouple input.
- Terminals 1 & 2: Power Supply (100-240VAC).
- Terminals 3, 4, 5: Relay Output (3: Normally Open, 4: Common, 5: Normally Closed).
- Terminals 6 & 7: Alarm Output.
- Terminals 8, 9, 10: Thermocouple Input (Connect K, J, or E type thermocouple here).
1.5 Wiring Diagram for SSR Output
For models with SSR output, follow this wiring diagram carefully. Ensure all connections are secure and correct before applying power.
Figure 1.5: REX-C100 SSR Output Wiring. This diagram shows how to connect the REX-C100 controller, a Solid State Relay (SSR-40 DA), a heating element (heating pipe), an alarm, and a K-type sensor. The controller's output drives the SSR, which in turn controls the heating element. The sensor provides temperature feedback to the controller.
Wiring Steps:
- Connect the 100-240V AC input to the power terminals (1 & 2) of the REX-C100 controller.
- Connect the control output from the REX-C100 (typically terminals 3 & 4 for SSR control, referring to the side panel image for 12VDC SSR output) to the input terminals (3-32VDC) of the SSR-40 DA.
- Connect the main power supply (24-380VAC) for the heating element through the output terminals (1 & 2) of the SSR-40 DA.
- Connect the K-type thermocouple to the thermocouple input terminals (8 & 9) of the REX-C100, ensuring correct polarity.
- If an alarm is used, connect it to the alarm output terminals (6 & 7).
Note: Always ensure power is disconnected before performing any wiring. Consult a qualified electrician if you are unsure about any wiring procedures.
2. Operating Instructions
2.1 Power On and Initial Display
After successful wiring, apply power to the controller. The PV display will show the current temperature measured by the thermocouple, and the SV display will show the last set temperature.
2.2 Setting the Target Temperature (SV)
- Press the SET button once. The SV display will start flashing.
- Use the PLUS (+) and MINUS (-) buttons to adjust the SV to your desired temperature.
- Use the MOVE button to shift the digit for faster adjustment.
- Press the SET button again to confirm the new SV and exit the setting mode. The controller will now begin to regulate the temperature to the new SV.
2.3 PID Control and Auto-tuning
The REX-C100 uses PID (Proportional-Integral-Derivative) control for precise temperature regulation. For optimal performance, auto-tuning is recommended after initial setup or if the controlled system changes significantly.
- To initiate auto-tuning, press and hold the SET button for approximately 3-5 seconds until the AT indicator starts flashing.
- During auto-tuning, the controller will cycle the output to analyze the system's thermal characteristics. The temperature may fluctuate around the SV.
- Once auto-tuning is complete, the AT indicator will stop flashing, and the controller will operate with optimized PID parameters.
- To cancel auto-tuning, press and hold the SET button again until the AT indicator turns off.
2.4 Advanced Parameter Settings
The REX-C100 has various advanced parameters that can be adjusted for specific applications. These include input type, control mode (PID/ON-OFF), alarm settings, and more. Refer to the detailed parameter list (usually provided in a separate comprehensive manual) for specific codes and adjustment ranges.
To access advanced parameters:
- Press and hold the SET button for an extended period (e.g., 5-10 seconds) until the first parameter code appears on the PV display.
- Use the SET button to cycle through the parameter codes.
- When the desired parameter code is displayed, use the PLUS (+) and MINUS (-) buttons to adjust its value.
- After adjusting, press SET to save the change and move to the next parameter, or hold SET to exit the parameter setting mode.
3. Maintenance
The REX-C100 PID Temperature Controller is designed for long-term, reliable operation with minimal maintenance. However, periodic checks can help ensure its longevity and accuracy.
- Cleaning: Keep the controller's front panel clean and free from dust. Use a soft, dry cloth. Do not use abrasive cleaners or solvents.
- Connections: Periodically check all wiring connections for tightness and signs of corrosion. Loose connections can lead to inaccurate readings or intermittent operation.
- Environment: Ensure the operating environment remains within the specified temperature and humidity ranges to prevent damage to internal components.
- Thermocouple: Inspect the thermocouple for physical damage or signs of wear. A damaged thermocouple can provide inaccurate temperature readings. Replace if necessary.
4. Troubleshooting
This section provides solutions to common issues you might encounter with your REX-C100 controller.
| Problem | Possible Cause | Solution |
|---|---|---|
| PV display shows "HHHH" or "LLLL" | Thermocouple open circuit or reversed polarity. Temperature exceeds measurement range. | Check thermocouple wiring and connections. Ensure correct polarity. Verify temperature is within the sensor's range. |
| Temperature not reaching SV | Heating element malfunction. Incorrect PID parameters. Insufficient heating capacity. | Check heating element and SSR. Perform auto-tuning. Ensure heating capacity matches application requirements. |
| Temperature overshoots/undershoots SV | PID parameters not optimized. | Perform auto-tuning to optimize PID parameters for your system. |
| Controller not powering on | No power supply. Incorrect wiring. | Check power connections (Terminals 1 & 2). Verify power source is active. |
| Output (OUT1) not activating | Wiring issue to SSR/relay. SV already reached. Controller in manual mode. | Check wiring to SSR/relay. Ensure SV is higher than PV (for heating). Check control mode settings. |
If the problem persists after attempting these solutions, please contact customer support.
5. Specifications
Detailed technical specifications for the REX-C100 PID Temperature Controller.
Figure 1.6: REX-C100 Dimensions and SSR-40 DA. This image provides physical dimensions for the REX-C100 controller (48mm x 48mm front panel, 86mm depth) and the SSR-40 DA (45.3mm x 60.1mm x 23.5mm). It also shows a heat sink and a K-type thermocouple.
| Feature | Specification |
|---|---|
| Model Number | REX-C100 series |
| Accuracy | ±0.5%FS ±1°C |
| Supply Voltage | 100-240VAC, 50/60 Hz |
| Input Types | Thermocouple: K, J, E |
| Output Types | Electromagnetic Relay + SSR (Solid State Relay) |
| Control Method | PID, or ON/OFF |
| Solid State Relay Output Current | 40A |
| SSR Input Voltage | DC 3-32V |
| SSR Output Voltage | 24-380V AC |
| Default Temperature Range | 0-400°C (adjustable to 0-999°C for K-type) |
| Item Weight | 50 Grams (approx. 1.76 ounces) |
| Package Dimensions | 1.18 x 0.79 x 0.39 inches (Controller dimensions are 48x48x86mm) |
6. Warranty Information
This product is covered by a standard manufacturer's warranty against defects in materials and workmanship. The specific duration and terms of the warranty may vary. Please retain your proof of purchase for any warranty claims. For detailed warranty information, refer to the documentation provided at the time of purchase or contact your retailer.
7. Customer Support
If you encounter any issues or have questions regarding the CEMELI REX-C100 PID Temperature Controller that are not addressed in this manual, please contact your point of purchase or the manufacturer's customer support. When contacting support, please have your product model number (REX-C100) and a detailed description of the issue ready.
For further assistance, you may also visit the official CEMELI website (if available) for FAQs, additional resources, or contact information.