1. Introduction
This manual provides instructions for the installation, operation, and maintenance of the HANLEI DVR-118R Digital Display Variable Resistor Potentiometer. This device is designed to serve as a precise, digitally displayed replacement for traditional potentiometers in various control systems, such as speed controllers and inverters. It is a potentiometer module and cannot be used to directly adjust power or load.
2. Safety Information
Please read and understand all safety instructions before installing or operating the device. Failure to follow these instructions may result in electric shock, fire, or damage to the product or connected equipment.
- Ensure power is disconnected before making any electrical connections.
- This device is intended for use by qualified personnel.
- Do not expose the device to moisture, extreme temperatures, or corrosive environments.
- Verify correct voltage and polarity before applying power.
- The DVR-118R is a potentiometer module; it is not designed to directly control power or high-current loads. Connect it only to control inputs of compatible devices.
3. Package Contents
Upon unpacking, please verify that all items are present and undamaged:
- 1 x HANLEI DVR-118R Digital Display Potentiometer Unit
- 2 x Removable Terminal Blocks (pre-installed)
Figure 1: Front view of the DVR-118R Digital Display Potentiometer.
4. Product Overview
The DVR-118R is a compact, DIN-rail mountable digital potentiometer featuring a clear digital display for precise value indication. It is designed for easy integration into industrial and DIY electrical control panels.
4.1 Key Features
- Digital display for accurate resistance value readout.
- Rotary knob for smooth and precise adjustment.
- DIN-rail mountable for convenient installation.
- Available in various resistance values (1K, 2.2K, 3.3K, 4.7K, 10K, 100K, 470K Ohm).
- Supports both AC and DC input power supplies.
4.2 Components
Figure 2: DVR-118R mounted on a DIN rail.
- Digital Display: Shows the current resistance value.
- Rotary Knob: Used to adjust the resistance value.
- A/B Buttons: Used for setting parameters or fine-tuning (specific functions may vary or be application-dependent).
- Terminal Blocks: For electrical connections (power input and potentiometer output).
- DIN Rail Clip: For mounting the unit onto a standard DIN rail.
5. Specifications
| Parameter | Value |
|---|---|
| Model Number | DVR-118R |
| Input Power Supply | AC 110-230V / DC 8-28V |
| Potentiometer Power | 2W |
| Available Resistance Values | 1K, 2.2K, 3.3K, 4.7K, 10K, 100K, 470K Ohm |
| DIY Supplies Category | Electrical |
| Origin | Mainland China |
| Certification | None |
Figure 3: Approximate dimensions of the DVR-118R unit.
6. Setup
6.1 Mounting
The DVR-118R is designed for easy mounting on a standard 35mm DIN rail. Simply align the device's rear clip with the DIN rail and press firmly until it clicks into place. To remove, pull the release tab (if present) and lift the unit off the rail.
Figure 4: DIN rail mounting mechanism.
6.2 Wiring
IMPORTANT: Ensure all power is disconnected before proceeding with wiring.
The DVR-118R uses removable terminal blocks for electrical connections. Carefully insert wires into the appropriate terminals and tighten the screws to secure them. Refer to the wiring diagram below for connection details.
Figure 5: Wiring Diagram. Connect power to the input terminals and the potentiometer output to your control circuit.
Note: This device is a potentiometer module. It cannot be used to adjust power and load directly. It is intended to be used as a replacement for potentiometers on existing controllers and devices, providing a control signal, not direct power regulation.
Figure 6: Terminal connections.
7. Operation
Once properly wired and powered on, the digital display will illuminate, showing the current resistance value.
7.1 Adjusting the Value
Rotate the front knob clockwise to increase the resistance value and counter-clockwise to decrease it. The digital display will update in real-time to show the precise setting.
Figure 7: Demonstration of the digital display changing values as the knob is rotated.
7.2 A/B Buttons
The A and B buttons on the front panel may be used for specific parameter settings or fine adjustments depending on the application. Refer to the documentation of the device you are connecting the potentiometer to for specific button functionalities, if any.
8. Maintenance
The DVR-118R is designed for reliable operation with minimal maintenance.
- Keep the unit clean and free from dust and debris. Use a soft, dry cloth for cleaning.
- Periodically check all electrical connections to ensure they remain secure.
- Avoid exposing the device to harsh chemicals or solvents.
9. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Digital display is off | No power supply or incorrect wiring. | Check input power connections (AC 110-230V or DC 8-28V) and ensure correct polarity for DC. |
| Incorrect resistance value displayed | Faulty wiring or internal issue. | Verify all wiring connections are correct and secure. If the problem persists, contact support. |
| Device not controlling connected equipment | Misunderstanding of device function; attempting to control power/load directly. | Remember, the DVR-118R is a potentiometer module, providing a control signal. It cannot directly handle power or load. Ensure it is connected to the control input of a compatible device (e.g., a speed controller's potentiometer input). |
10. User Tips
- Understand its Role: The DVR-118R functions as a signal generator (variable resistance) for other electronic circuits. It is not a power regulator or a device that can directly drive motors or heaters.
- Check Compatibility: Before connecting, ensure your target device (e.g., inverter, motor controller) is designed to accept a potentiometer as an input for control.
- Verify Input Type: Double-check if your application requires AC or DC input power for the DVR-118R and select the appropriate model/wiring.
11. Warranty and Support
For warranty information or technical support, please contact your retailer or the manufacturer directly. Provide your model number (DVR-118R) and a detailed description of the issue when seeking assistance.