1. Introduction
The CT8893D/CT8893B is an advanced temperature controller designed for air dryers, air compressors, and coal coolers. It is capable of monitoring and controlling dew point and condensation temperatures, ensuring optimal performance and energy efficiency of your industrial equipment. This manual provides detailed instructions for the installation, operation, and maintenance of the controller.
2. Specifications
| Feature | Specification |
|---|---|
| Model | CT8893D, CT8893B |
| DIY Supplies | Electrical |
| Origin | Mainland China (Guangdong) |
| Certification | CE |
| Type | PLC Controller Board, Temperature controller for air dryer |
| Material | Plastic (PC-ABS) |
| Temperature Range | -50℃ to 150℃ (resolution 1℃) / -58℉ to 302℉ (resolution 0.1℉) |
| Power Supply Voltage | 220V ± 10% AC or 380V ± 10% AC (refer to product label) |
| Usage Environment Temperature | -10℃ to 50℃ |
| Usage Environment Humidity | ≤ 85% (non-condensing) |
| Output Contact Capacity (Compressor) | 20A / 250VAC (pure resistive load) |
| Output Contact Capacity (Defrosting/Fan) | 8A / 250VAC (pure resistive load) |
| Temperature Sensor | NTC R25=5kΩ, B(25/50)=3470K |
| Ingress Protection (IP) Rating | IP65 CAT II |
3. Setup and Installation
Before installation, ensure the power supply is disconnected to prevent electrical shock. The controller should be mounted in a location that meets the specified usage environment conditions (temperature and humidity) and allows for proper ventilation.
3.1 Wiring Diagram
Refer to the detailed wiring diagram on the back of the controller for correct connections. The following table outlines the terminal assignments:
| Terminal No. | Description |
|---|---|
| 1, 2 | T1: Dew point temperature sensor input |
| 3, 4 | T2: Condensation temperature sensor input |
| 5, 6 | S1: External Alarm Signal input |
| 7, 8 | Compressor output (20A / 250VAC) |
| 9, 10 | Fan output (8A / 250VAC) |
| 11 | N: Neutral power input (220V AC) |
| 12 | L: Live power input (220V AC) |
Ensure all connections are secure and correctly matched to avoid damage to the controller or connected equipment.
4. Operating Instructions
The CT8893D/CT8893B controller offers a range of functions to manage your air dryer system effectively.
4.1 Main Functions
- Temperature Display: Real-time display of current temperatures (dew point and condensation).
- Temperature Control: Adjustable cooling/heating modes to maintain desired temperature set points.
- Compressor Startup Delay Protection: Protects the compressor from frequent starts, extending its lifespan.
- Defrosting Modes: Supports two defrosting methods: electric defrosting and hot gas defrosting.
- Defrosting Start Modes: Configurable to start defrosting based on a time interval or cumulative compressor operation time.
- Defrosting End Modes: Defrosting can be terminated by dual control of timing and temperature, ensuring thorough defrosting.
- Defrosting Drip: Manages the drip time after defrosting to remove excess water.
- Manual Defrosting: Allows for manual initiation of the defrosting cycle.
- Sensor Abnormal Alarm: Alerts the user to any issues with the temperature sensors.
- External Alarm Signal Input: Can receive and process external alarm signals from other system components.
- Password Protection: Access to advanced settings can be protected by a password.
- Fahrenheit/Celsius Conversion: Easily switch between temperature units.
4.2 Control Buttons
The controller features intuitive buttons for navigation and setting adjustments:
- Up (↑) / Down (↓) Buttons: Used to navigate menus and adjust parameter values.
- M Button: Typically used to enter menu mode or confirm selections.
- Set Button: Used to save settings or confirm actions.
Detailed programming instructions for specific parameters (e.g., setting temperature set points, defrosting intervals) are typically found in the full programming guide, which may be available from the manufacturer.
5. Maintenance
Regular maintenance helps ensure the longevity and reliable operation of your CT8893D/CT8893B controller.
- Cleaning: Periodically wipe the controller's surface with a soft, dry cloth. Avoid using abrasive cleaners or solvents that could damage the casing or display.
- Connection Checks: Annually inspect all wiring connections to ensure they are tight and free from corrosion. Loose connections can lead to intermittent operation or damage.
- Sensor Inspection: Check temperature sensors for physical damage or buildup that might affect their accuracy. Clean or replace as necessary.
- Environmental Conditions: Ensure the operating environment remains within the specified temperature and humidity ranges to prevent premature failure.
6. Troubleshooting
This section provides general guidance for common issues. For complex problems, contact technical support.
- Controller Not Powering On:
- Check the power supply voltage at terminals N and L.
- Ensure all power connections are secure.
- Verify the circuit breaker or fuse for the power supply.
- Incorrect Temperature Readings:
- Check the connections of T1 and T2 sensors.
- Inspect sensors for damage or corrosion.
- Ensure sensors are correctly positioned to measure the intended temperatures.
- Compressor/Fan Not Activating:
- Verify the temperature set points and control modes.
- Check the wiring to the compressor and fan outputs (terminals 7-10).
- Ensure there are no active alarms (e.g., sensor abnormal, external alarm) preventing operation.
- Check for compressor startup delay settings.
- Defrosting Issues:
- Review defrosting mode, start, and end settings.
- Check connections to defrosting components (if applicable, through compressor/fan outputs).
- Display Errors:
- If the display shows an error code, consult the full product manual for specific error definitions.
- A power cycle (turning off and on) might resolve temporary display glitches.
7. User Tips
No specific user tips from reviews or Q&A were available for this product. However, general best practices include:
- Always ensure proper grounding for electrical safety.
- Keep the controller's display clean for easy monitoring.
- Familiarize yourself with the programming parameters to fully utilize the controller's features.
- For critical applications, consider having a backup controller or spare parts readily available.
8. Warranty and Support
The CT8893D/CT8893B Air Dryer Temperature Controller comes with a 1-Year Warranty from the date of purchase, covering manufacturing defects.
For technical support, inquiries, or assistance with customization or production, please contact:
Contact Person: Phoebe
Email: sales_phoebe@126.com
Whatsapp: +852 65705287
Please provide your product model and a detailed description of the issue when contacting support to ensure a prompt resolution.
