1. Introduction
This manual provides detailed instructions for the installation, operation, and maintenance of the LDHJBNAC CH102 Digital PID Temperature Controller. This device is designed for precise temperature control in various industrial and commercial applications, featuring a relay output for controlling heating or cooling elements.
Key Features:
- Simplified Operation: Designed for ease of use with straightforward parameter setting.
- High Accuracy: Provides precise temperature display and control.
- Mounting: Features flush mounting and secure screw terminals for installation.
- Wide Application: Suitable for light industry, chemistry, machinery, metallurgy, ceramics, petrification, food & beverage, ovens, furnaces, and plastic extruder heating processes.
2. Product Overview
The CH102 controller features a clear digital display for Process Value (PV) and Set Value (SV), along with indicators for AT (Auto-Tuning), OUT1 (Output 1), OUT2 (Output 2), ALM1 (Alarm 1), and ALM2 (Alarm 2). Control buttons include SET, R/S (Run/Stop or Reset), and Up/Down arrows for navigation and value adjustment.
Figure 2.1: Front panel of the CH102 Temperature Controller, showing PV/SV displays and control buttons.
3. Setup and Installation
Before installation, ensure the power supply is disconnected. The CH102 is designed for flush mounting. Carefully follow the wiring diagram provided on the side of the unit for correct connections.
3.1 Wiring Instructions
Refer to the diagram below for proper electrical connections. Incorrect wiring can damage the unit or connected equipment.
Figure 3.1: Side panel with wiring diagram for power, input, and output connections.
- Power Supply (AC 100-240V): Connect to terminals 1 and 2.
- Relay Output (OUT1): Connect to terminals 3 and 4 (Normally Open - NO).
- Alarm Output (ALM1/ALM2): Connect to terminals 7, 8, 9 (NO/NC).
- Temperature Sensor Input (Type K Thermocouple or RTD): Connect to terminals 10, 11, 12. Ensure correct polarity for thermocouples.
Figure 3.2: Detailed view of the screw terminals for secure wiring connections.
Caution: Read the operation manual before use. Otherwise, injury or accident may happen.
4. Operating Instructions
The CH102 controller is designed for intuitive operation. The upper display (PV) shows the current process temperature, while the lower display (SV) shows the set target temperature.
4.1 Setting the Target Temperature (SV)
- Press the SET button once. The SV display will begin to flash.
- Use the Up (▲) and Down (▼) arrow buttons to adjust the target temperature to your desired value.
- Press the SET button again to confirm the new SV and exit the setting mode. The SV display will stop flashing.
4.2 Accessing Advanced Parameters
To access advanced parameters such as PID settings, alarm configurations, or input type selection:
- Press and hold the SET button for approximately 3-5 seconds until the display changes to show a parameter code.
- Use the SET button to cycle through different parameter codes.
- Use the Up (▲) and Down (▼) arrow buttons to adjust the value of the currently displayed parameter.
- After adjusting, press SET to save the change and move to the next parameter, or press and hold SET again to exit the advanced parameter mode.
4.3 Auto-Tuning (AT) Function
The auto-tuning function helps the controller automatically determine optimal PID parameters for your specific heating/cooling system. To initiate auto-tuning:
- Ensure the system is at a stable temperature, preferably near the desired SV.
- Access the advanced parameter menu (refer to Section 4.2).
- Locate the auto-tuning parameter (often labeled "AT" or similar). Set its value to "1" or "ON".
- Exit the parameter menu. The "AT" indicator on the front panel will illuminate, and the controller will begin the auto-tuning process. This may involve several cycles of heating and cooling.
- Once auto-tuning is complete, the "AT" indicator will turn off, and the controller will operate with the newly calculated PID parameters.
5. Maintenance
The LDHJBNAC CH102 Temperature Controller requires minimal maintenance to ensure long-term reliable operation.
- Cleaning: Periodically wipe the front panel with a soft, dry cloth. Avoid using abrasive cleaners or solvents.
- Connections: Regularly check all wiring connections to ensure they are secure and free from corrosion.
- Environment: Ensure the operating environment remains within the specified temperature and humidity ranges to prevent damage. Avoid excessive dust or moisture.
6. Troubleshooting
This section provides solutions to common issues encountered with the CH102 Temperature Controller.
| Problem | Possible Cause | Solution |
|---|---|---|
| Controller does not power on. | No power supply; incorrect wiring; blown fuse. | Check power connections (terminals 1 & 2). Verify power source. Inspect internal fuse if accessible (consult qualified personnel). |
| PV display shows "HHHH" or "LLLL". | Sensor open circuit (HHHH) or short circuit (LLLL); sensor wired incorrectly; sensor type mismatch. | Check sensor wiring (terminals 10, 11, 12). Ensure sensor type matches controller settings. Replace faulty sensor. |
| Output (OUT1) does not activate. | SV not reached; output wiring incorrect; controller in manual mode; faulty relay. | Verify SV is set correctly. Check output wiring (terminals 3 & 4). Ensure controller is in automatic control mode. Test relay if possible. |
| Temperature oscillates widely. | PID parameters not optimized; system disturbance. | Perform auto-tuning (Section 4.3). Manually adjust PID parameters if auto-tuning is insufficient. |
7. Specifications
| Parameter | Value |
|---|---|
| Model | CH102 |
| Brand | LDHJBNAC |
| Input Type | Multiple Input (K-type Thermocouple, RTD, etc.) |
| Output Type | Relay Output (1 Alarm) |
| Supply Voltage | 100-240VAC, 50/60Hz |
| Power Consumption | 7VA (100V), 10VA (240V) |
| Temperature Range | 0-400°C (for K-type input) |
| Ambient Temperature | Max 50°C |
| Item Weight | 300 Grams (approx. 10.6 ounces) |
| Package Dimensions | 1.18 x 0.79 x 0.39 inches |