1. Introduction
The SKG TREX-CT401B is a versatile temperature and time integrated meter designed for precise control in various applications, particularly within garment and ironing equipment. This device combines temperature regulation and timing functions into a single unit, offering efficient and accurate process management. This manual provides essential information for the safe and effective installation, operation, and maintenance of your TREX-CT401B meter.
2. Product Overview
The TREX-CT401B features a clear dual-display interface for process value (PV) and set value (SV), along with indicator lights for various operational states and intuitive control buttons.
Front Panel Elements:
- PV Display (Red): Shows the current process value (e.g., actual temperature).
- SV Display (Green): Shows the set value (e.g., target temperature or time).
- AT Indicator: Illuminates when the auto-tuning function is active.
- OUT1 Indicator: Illuminates when Output 1 is active.
- AL Indicator: Illuminates when an alarm condition is met.
- OUT2 Indicator: Illuminates when Output 2 is active.
- SET Button: Used to enter parameter setting mode and confirm selections.
- Down Arrow Button: Used to decrease values or navigate menu options.
- Up Arrow Button: Used to increase values or navigate menu options.
3. Specifications
| Feature | Specification |
|---|---|
| Model Number | TREX-CT401B |
| Power Supply | 85-265VAC (Custom 24VDC/AC available) |
| External Dimensions (LxWxH) | 70mm x 96mm x 48mm |
| Panel Size | 96mm x 48mm |
| Installation Opening Size | 92mm x 45mm |
| Temperature Range | -20°C to 400°C |
| Main Output Mode | V-SSR (Solid State Relay), M-Timing Output RELAY (Relay) |
| Auxiliary Output Mode | M-Auxiliary Output RELAY (Relay) with 6 programmable modes |
| Timing Unit | Seconds (S), Minutes (M), Hours (H) - Self-programming selection |
| Temperature Sensor Compatibility | Various non-standard customization options |
| Is Smart Device | No |
| Origin | Mainland China |
4. Installation
Proper installation is crucial for the safe and accurate operation of the TREX-CT401B meter. Ensure all power is disconnected before proceeding with wiring.
4.1 Panel Mounting
- Cut an opening of 92mm x 45mm in your equipment panel.
- Insert the TREX-CT401B meter into the cutout from the front.
- Secure the meter using the provided mounting brackets from the rear of the panel.
4.2 Wiring Diagram
Refer to the wiring diagram below for correct electrical connections. Incorrect wiring can damage the device or lead to unsafe conditions.
Terminal Connections:
| Terminal Numbers | Function | Description |
|---|---|---|
| 1, 2 | AL-OUT | Alarm Output (Normally Open, Common) |
| 3, 4, 5 | RESET (计时触发) | Timing Trigger Input (Normally Open, Common, Normally Closed) |
| 6, 7, 8 | TC + | Temperature Sensor Input (B, A, +) |
| 9, 10 | 85-265VAC | Main Power Supply Input |
| 11, 12 | SSR + | Solid State Relay Output (Normally Open, Common) |
| 13, 14 | OUT1 | Output 1 (Normally Closed, Normally Open) |
| 15, 16 | OUT2 | Output 2 (Normally Open, Common) |
WARNING: Ensure all wiring is done by a qualified professional and adheres to local electrical codes. Disconnect power before making any connections.
5. Operation
The TREX-CT401B allows for setting both temperature and time parameters. The specific programming steps may vary based on the configured output modes (V-SSR, Timing Relay, Auxiliary Relay).
5.1 Basic Parameter Setting
- Power On: Connect the device to the power supply (85-265VAC). The PV and SV displays will light up.
- View Current Values: The PV display shows the current measured temperature, and the SV display shows the current set temperature or time.
- Enter Setting Mode: Press and hold the SET button for a few seconds to enter the parameter setting mode. The SV display will show the first programmable parameter.
- Navigate Parameters: Use the Up and Down arrow buttons to scroll through different parameters (e.g., set temperature, timing duration, alarm limits, control modes).
- Adjust Values: When the desired parameter is displayed, press the SET button briefly to select it. Use the Up and Down arrow buttons to adjust the value.
- Confirm and Exit: Press the SET button again to confirm the new value and move to the next parameter. To exit the setting mode and save changes, press and hold the SET button for a few seconds until the device returns to normal operation.
5.2 Temperature Control
Set the desired temperature using the SV parameter. The device will activate OUT1 (or SSR+) to maintain the PV at the SV, based on the configured control mode (e.g., PID, ON/OFF).
5.3 Timing Function
If configured for timing output, set the desired duration (in seconds, minutes, or hours) using the relevant timing parameter. The timing function can be triggered via the RESET input (Terminals 3, 4, 5) or other programmed conditions.
5.4 Auto-Tuning (AT)
If your model supports auto-tuning, activate it from the parameter settings. The AT indicator will light up, and the controller will automatically determine optimal PID parameters for stable temperature control. This process may involve temporary temperature fluctuations.
6. Maintenance
The SKG TREX-CT401B is designed for reliable operation with minimal maintenance. However, regular checks can help ensure its longevity and performance.
- Cleaning: Wipe the front panel with a soft, dry cloth. Do not use abrasive cleaners or solvents.
- Connections: Periodically check all wiring connections to ensure they are secure and free from corrosion.
- Environment: Ensure the operating environment is within the specified temperature and humidity ranges to prevent damage.
- Calibration: If temperature readings appear inaccurate, professional calibration may be required.
WARNING: Disconnect power to the device before performing any maintenance or cleaning.
7. Troubleshooting
This section addresses common issues you might encounter with your TREX-CT401B meter.
| Problem | Possible Cause | Solution |
|---|---|---|
| No display/Power off | No power supply; Incorrect wiring | Check power connections (Terminals 9, 10) and ensure voltage is within 85-265VAC. Verify wiring against Figure 4.1. |
| PV display shows 'HHHH' or 'LLLL' | Temperature sensor open circuit or short circuit; Sensor type mismatch | Check temperature sensor wiring (Terminals 6, 7, 8). Ensure the sensor is correctly connected and not damaged. Verify the sensor type configured in the meter matches the connected sensor. |
| Output not activating | Incorrect set value; Output mode misconfiguration; Wiring issue | Check SV and ensure it's within the operating range. Verify the main and auxiliary output modes are correctly set. Inspect output wiring (SSR+, OUT1, OUT2). |
| Temperature unstable/overshoots | PID parameters not optimized | Perform auto-tuning (AT function) to optimize PID parameters for your specific system. |
| Timing function not working | Timing mode misconfigured; Trigger input issue | Verify the timing unit (S, M, H) and mode are correctly set. Check the RESET input wiring and trigger signal. |
If the problem persists after trying these solutions, please contact customer support.
8. User Tips
- For critical applications, always test the temperature and timing accuracy after initial setup and any parameter changes.
- Consider using the auto-tuning function for optimal temperature stability, especially after changing the heating element or process load.
- Keep a record of your parameter settings for quick reference or restoration.
9. Warranty and Support
For warranty information, technical support, or service inquiries, please refer to the documentation provided with your purchase or contact your retailer. Ensure you have your product model number (TREX-CT401B) and any relevant purchase details available when seeking support.
