1. Introduction
The MYPIN LH86-RR4D is a high-precision 6-digit LED digital display weight indicator and controller designed for various weighing applications. It features RS485 communication, mixed batching control, and supports 1-4 load cells. This manual provides essential information for the safe and efficient installation, operation, and maintenance of your device.
Video: Overview of MYPIN LM/LH Weighing/Force Indicators.
2. Setup
2.1 Unpacking
Carefully unpack the device and inspect it for any signs of damage. Ensure all components listed in the packing list are present. Keep the original packaging for future transport or storage.
Image: MYPIN LH86-RR4D unit and packaging.
2.2 Physical Installation
The LH86-RR4D is designed for panel mounting. The dimensions of the unit are 48mm (width) x 96mm (height) x 80mm (depth). Ensure adequate space for ventilation and wiring connections.
Image: Load cell dimensions and ordering code table. This image also shows the overall dimensions of the unit.
2.3 Wiring Connections
Refer to the wiring diagram below for proper connection of power, load cells, RS485 communication, and alarm outputs. Incorrect wiring can damage the device or connected equipment.
Image: Detailed wiring diagram for the LH86-RR4D.
Key Connections:
- Power Supply: Connect to terminals 23 and 24. The device supports 90-260V AC/DC.
- Load Cell Input: The device supports 1-4 load cells. Connect the load cell excitation (EXC+ and EXC-) and signal (SG+ and SG-) wires to the corresponding terminals (e.g., EXC+ to 5, EXC- to 6, SG+ to 8, SG- to 7).
- RS485 Communication: Connect RS485 A+ to terminal 2 and RS485 B- to terminal 1.
- Alarm Outputs (AL1, AL2): These are relay outputs. Connect external devices to terminals 20-22 for AL1 and AL2.
- RST/TARE: Connect to terminals 9-12 for reset/tare functionality.
Image: Rear view of the LH86-RR4D showing the terminal block for wiring.
3. Operating Instructions
The LH86-RR4D features a 6-digit LED display for Process Value (PV) and Set Value (SV), along with indicator lights for AL1, AL2, and OUT. Control is managed via the front panel buttons.
Image: Front panel of the MYPIN LH86-RR4D showing the display and control buttons.
3.1 Front Panel Controls
- PV Display: Shows the current weight reading.
- SV Display: Shows the set point or target value.
- AL1, AL2, OUT Indicators: Light up to indicate alarm states or output activation.
- SET Button: Used to enter parameter setting mode and confirm selections.
- /RST Button: Used for resetting functions or clearing tare.
- Up/Down Arrows: Used to navigate menus and adjust parameter values.
3.2 Basic Operation
- Power On: After proper wiring, apply power to the device. The display will show a self-test sequence before settling on the current weight.
- Tare Function: To zero out the weight of a container, place the empty container on the scale and press the /RST button. The display will show zero.
- Setting Parameters: Press the SET button to enter the parameter setting mode. Use the Up/Down arrows to navigate through parameters and adjust values. Press SET again to confirm and save changes.
- Mixed Batching Control: The device supports mixed batching. Refer to the detailed programming guide (not provided in this manual) for specific setup and operation of batching sequences.
- Data/Peak Value Holding: This function can be configured to hold the current data or the peak weight value. Consult the full product manual for activation and configuration details.
4. Maintenance
- Cleaning: Clean the device regularly with a soft, dry cloth. Do not use abrasive cleaners or solvents.
- Environmental Conditions: Ensure the device operates within its specified temperature and humidity ranges to prevent malfunction.
- Wiring Inspection: Periodically check all wiring connections for tightness and signs of wear or corrosion.
- Calibration: For accurate weighing, periodic calibration of the load cells and controller may be required. This typically involves using known weights and following a specific calibration procedure (refer to the full product manual).
5. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No display/No power | Incorrect power wiring, power supply failure, internal fuse blown. | Check power connections (90-260V AC/DC). Verify power supply. Consult a qualified technician for internal inspection. |
| Inaccurate weight readings | Load cell wiring error, load cell damage, calibration required, unstable environment. | Verify load cell wiring. Check load cell integrity. Perform calibration. Ensure stable operating environment. |
| RS485 communication failure | Incorrect wiring (A+/B- reversed), incorrect communication settings (baud rate, parity), faulty cable. | Check RS485 wiring. Verify communication parameters in device settings. Test with a different cable. |
| Alarms not triggering | Alarm set points incorrect, relay wiring error, relay failure. | Review and adjust alarm set points. Check relay output wiring. Test external alarm device. |
6. Specifications
| Feature | Specification |
|---|---|
| Model Number | LH86-RR4D |
| Display Type | 6 digits LED display |
| Power Supply | 90-260V AC/DC |
| Input | 1-4 PCS LOADCELL |
| Output | RS485 (MODBUS-RTU Protocol) |
| Alarm Output | 2-relays (Normal open contact 250V 3A OR 30V 3A, resistive load; SSR: 12V/24V, 30mA) |
| Accuracy | ±0.1%F.S ±2d |
| AUX. Power | 5V/80mA |
| Size | 48*96*80mm |
| Material | ABS Plastic |
| DIY Supplies | Electrical |
| Origin | Mainland China (Guangdong) |
7. User Tips
- For optimal accuracy, allow the device to warm up for at least 15-30 minutes after powering on before taking critical measurements.
- When connecting load cells, ensure all connections are secure and shielded cables are used to minimize electrical interference.
- Regularly check the stability of the mounting surface for the load cells and the controller to prevent measurement fluctuations.
- If using the RS485 communication, double-check the baud rate, data bits, parity, and stop bits settings to match your master device.
8. Warranty and Support
8.1 Warranty
This product comes with an 18-month warranty from the date of purchase. The warranty covers manufacturing defects and malfunctions under normal use. Please retain your proof of purchase for warranty claims.
8.2 Technical Support
For any technical assistance or inquiries, please contact MYPIN customer support:
- Phone Services: Available 24 hours/day.
- Email Services: Your email inquiries will be responded to within 12 hours.
- Contact Address: 7, Lane 5, Str. Anhe, Fengyu Road, Dongfeng Town, Zhongshan, Guangdong, China.
- Website: www.mypinchina.com
We value your feedback and suggestions regarding our products and services. Please do not hesitate to reach out if you have any questions or concerns.
