1. Introduction
The Selec CH-403-2 is a precision temperature chiller controller designed for industrial and commercial applications requiring accurate temperature regulation. This manual provides essential information for the safe and efficient installation, operation, and maintenance of your device. Please read this manual thoroughly before installation and operation.
2. Safety Information
Always observe the following safety precautions to prevent injury and damage to the device:
- Ensure the power supply is disconnected before performing any wiring or maintenance.
- Installation and servicing should only be performed by qualified personnel.
- Verify that the power supply voltage matches the specifications of the controller.
- Do not expose the controller to excessive moisture, dust, or corrosive gases.
- Ensure proper grounding to prevent electrical shock.
3. Setup
3.1 Unpacking
Carefully remove the controller from its packaging. Inspect the device for any signs of damage during transit. Report any damage to your supplier immediately.
3.2 Mounting
The CH-403-2 is designed for panel mounting. Cut an opening of 45mm x 45mm (1.77" x 1.77") in the panel. Insert the controller into the opening and secure it using the provided mounting clamps. Ensure a snug fit to prevent dust and moisture ingress.
3.3 Wiring Connections
Refer to the wiring diagram located on the side of the controller or in the detailed technical specifications. Ensure all connections are secure and correct before applying power.
- Power Supply: Connect the appropriate AC voltage (e.g., 230V AC) to the designated power terminals.
- Sensor Input: Connect the temperature sensor (e.g., NTC, PT100) to the sensor input terminals. Observe polarity if applicable.
- Control Output: Connect the chiller or heating element to the relay output terminals. Ensure the load current does not exceed the relay's maximum rating.
- Alarm Output (Optional): If applicable, connect external alarm devices to the alarm output terminals.
3.4 Initial Power-Up
After all connections are verified, apply power to the controller. The display should illuminate, showing the current temperature and default settings.
4. Operating
4.1 Display Overview
The front panel features a digital display showing the process value (PV) and set point (SV), along with indicator LEDs for output status (e.g., ON/OFF, Alarm).
4.2 Button Functions
- SET Button: Used to enter parameter setting mode and confirm selections.
- UP/DOWN Buttons: Used to navigate through parameters and adjust values.
- MODE Button: Used to switch between display modes or access advanced settings.
4.3 Setting Temperature Setpoint (SV)
- Press the SET button once. The SV value will flash.
- Use the UP or DOWN buttons to adjust the setpoint to the desired temperature.
- Press the SET button again to confirm the new setpoint. The display will return to showing the PV.
4.4 Parameter Configuration
To access advanced parameters such as hysteresis, calibration offset, or delay times, press and hold the SET button for several seconds until the first parameter code appears. Use the UP/DOWN buttons to navigate through parameters and the SET button to select and modify values. Refer to the detailed parameter list in the full technical manual for specific codes and ranges.
5. Maintenance
5.1 Cleaning
Clean the front panel of the controller periodically with a soft, damp cloth. Do not use abrasive cleaners or solvents, as these can damage the display or casing. Ensure no liquid enters the device.
5.2 Regular Checks
- Inspect wiring connections for looseness or corrosion.
- Verify the temperature sensor is clean and properly installed.
- Check for any unusual noises or smells from the controller or connected equipment.
5.3 Calibration
If temperature readings appear inaccurate, the sensor or controller may require calibration. Refer to the advanced parameter settings for sensor offset adjustment. For precise calibration, consult a qualified technician.
6. Troubleshooting
This section addresses common issues you might encounter. For problems not listed here, contact technical support.
| Problem | Possible Cause | Solution |
|---|---|---|
| No display / Power off | No power supply; Incorrect wiring; Blown fuse | Check power connections; Verify voltage; Replace fuse if necessary. |
| Incorrect temperature reading | Sensor faulty; Sensor wiring incorrect; Calibration offset needed | Check sensor connections; Replace sensor; Adjust calibration offset in parameters. |
| Output not switching | Setpoint not reached; Hysteresis setting too wide; Output relay faulty | Verify setpoint and current temperature; Adjust hysteresis; Test output relay (by qualified personnel). |
| Error Code 'E1' | Sensor open circuit | Check sensor wiring for breaks; Replace sensor. |
| Error Code 'E2' | Sensor short circuit | Check sensor wiring for shorts; Replace sensor. |
7. Specifications
| Parameter | Value |
|---|---|
| Model | CH-403-2 |
| Input Type | NTC / PT100 (selectable) |
| Temperature Range | -50°C to 150°C (sensor dependent) |
| Control Output | 1 x Relay (NO/NC), 5A @ 250V AC resistive |
| Auxiliary Output | 1 x Relay (NO), 3A @ 250V AC resistive (Alarm) |
| Supply Voltage | 230V AC ±10%, 50/60 Hz |
| Accuracy | ±1% of full scale ±1 digit |
| Display | 3-digit LED |
| Mounting | Panel Mount (45x45mm cutout) |
| Operating Temperature | 0°C to 50°C |
| Dimensions (WxHxD) | 48mm x 48mm x 85mm |
8. Warranty and Support
Selec products are covered by a standard manufacturer's warranty against defects in materials and workmanship. For specific warranty terms and conditions, please refer to the documentation provided with your purchase or visit the official Selec website. For technical support, service, or spare parts, please contact your authorized Selec distributor or customer service department, providing your product model number (CH-403-2) and serial number.
