1. Introduction
The MYPIN LM8-RRD Digital Weighing Controller is a high-precision instrument designed for various weighing and load cell applications. It features dual LED displays for Process Value (PV) and Set Value (SV), offering clear readings and easy operation. With its steady performance and two relay outputs, it is suitable for weight control, auto accumulation, and batch control systems.
2. Package Contents
Please check the package carefully to ensure all items are present and undamaged:
- 1 x MYPIN Digital Weighing Controller (Model: LM8-RRD)
- 2 x Mounting Brackets
- 1 x User Manual (English)
3. Specifications
| Feature | Specification |
|---|---|
| Model | LM8-RRD (4 Digits) |
| Display | LED Display (PV & SV) |
| Power Supply | 220V/110V AC |
| Accuracy | 0.2%F.S ±2dgt |
| Power Consumption | ≤5VA |
| Sampling Rate | ≤16 times/second |
| Input | mV (Load Cell), 1-4 pcs Load Cell |
| Output | 2 RELAY |
| Relay Specification | Open Contact 250V AC 3A or 30V DC 3A COSφ=1 |
| Auxiliary Power | DC 5V |
| Dimensions (L x W x H) | 95 x 85 x 46mm / 3.74 x 3.35 x 1.81in |
| Weight | 258g / 9.12oz |
| Material | Plastic + Metal |
4. Setup
4.1 Physical Installation
The MYPIN LM8-RRD controller is designed for panel mounting. Use the provided mounting brackets to secure the device into a suitable panel cutout. Ensure adequate ventilation around the unit to prevent overheating.
4.2 Wiring Diagram
Refer to the diagram below for proper electrical connections. Ensure all power is disconnected before performing any wiring to prevent electric shock or damage to the device.
Wiring Terminal Descriptions:
- AC 220V / 110V AC: Power input terminals. Connect according to your local power supply voltage.
- LOAD CELL Input:
- EXCSY: Excitation voltage output for load cell.
- SC-V: Signal input negative for load cell.
- SC+V: Signal input positive for load cell.
- EXCSY: Excitation voltage output for load cell (second terminal, typically for sense wires or redundant connection).
- Output Relays:
- COM: Common terminal for relay outputs.
- AL1: Alarm 1 relay output.
- AL2: Alarm 2 relay output.
- OUT: Main control output relay.
- Auxiliary Power: DC 5V output.
4.3 Initial Power-Up
After all wiring is securely connected and verified, apply power to the controller. The LED displays should illuminate, showing the current Process Value (PV) and Set Value (SV).
5. Operating Instructions
5.1 Front Panel Overview
- PV Display (Top): Shows the current Process Value (e.g., weight from the load cell).
- SV Display (Bottom): Shows the Set Value or parameter value during configuration.
- SET Button: Used to enter parameter setting mode and confirm selections.
- << / RST Button: Used to shift digits during parameter setting or to reset the device/process.
- Up (↑) Button: Used to increase values or navigate through menu options.
- Down (↓) Button: Used to decrease values or navigate through menu options.
- AL1 Indicator: Illuminates when Alarm 1 condition is met.
- AL2 Indicator: Illuminates when Alarm 2 condition is met.
- OUT Indicator: Illuminates when the main control output is active.
5.2 Basic Operation
- Power On: Connect the device to the appropriate AC power supply (110V or 220V).
- Zero Clearing: The instrument has a function for clearing zero. Consult the detailed manual (if available) for specific button sequences or menu options to perform this. This is crucial for accurate weighing.
- PV Modification: The Process Value (PV) can be modified. This might be used for calibration or fine-tuning the displayed weight. Refer to the full manual for the exact procedure.
- Setting Parameters (SV):
- Press the SET button to enter parameter setting mode.
- Use the Up (↑) and Down (↓) buttons to navigate through parameters.
- Use the << / RST button to shift the cursor to select specific digits for modification.
- Use the Up (↑) and Down (↓) buttons to change the value of the selected digit.
- Press SET again to confirm the value and move to the next parameter, or to exit the setting mode.
- Relay Control: The AL1, AL2, and OUT indicators will light up when their respective relay outputs are activated based on the configured set points and control logic.
For detailed programming and advanced functions (e.g., auto accumulation, mean calculation, batch control), please refer to the comprehensive user manual provided with the product or available from the manufacturer.
6. Maintenance
- Cleaning: Wipe the unit with a soft, dry cloth. Do not use abrasive cleaners or solvents.
- Environment: Ensure the controller is operated within its specified environmental conditions (temperature, humidity) to maintain optimal performance and longevity.
- Connections: Periodically check all wiring connections for tightness and signs of corrosion.
- Calibration: Regular calibration of the load cell and controller system is recommended to ensure continued accuracy, especially in critical applications.
7. Troubleshooting
If you encounter issues with your MYPIN LM8-RRD controller, try the following basic troubleshooting steps:
| Problem | Possible Cause | Solution |
|---|---|---|
| No display after power-up | No power, incorrect wiring, or faulty unit. | Check power supply connections. Verify input voltage (110V/220V AC). Ensure wiring is correct as per diagram. |
| Incorrect weight reading (PV) | Load cell not connected, faulty load cell, incorrect calibration, or zero not cleared. | Check load cell wiring. Perform zero clearing. Recalibrate the system. Test load cell independently if possible. |
| Relays (AL1, AL2, OUT) not activating | Incorrect set points, control logic error, or faulty relay. | Verify set points (SV) are correctly configured. Check control logic parameters. Ensure the PV is reaching the set point. |
| Unstable readings | Electrical noise, mechanical vibration, or faulty load cell/wiring. | Ensure proper grounding. Shield load cell cables. Minimize vibration. Check for loose connections. |
If the problem persists after attempting these solutions, please contact technical support.
8. User Tips
- Stable Power: Always ensure a stable and correct power supply (110V or 220V AC) to prevent erratic behavior or damage.
- Proper Grounding: For optimal accuracy and to minimize electrical interference, ensure the controller and load cell system are properly grounded.
- Cable Management: Keep load cell signal cables separate from power cables to reduce noise interference. Use shielded cables for load cells if possible.
- Regular Calibration: For applications requiring high precision, establish a routine calibration schedule for your load cell and controller.
9. Warranty and Support
The MYPIN LM8-RRD Digital Weighing Controller is covered by a standard manufacturer's warranty against defects in materials and workmanship. For warranty claims, technical assistance, or further support, please contact your point of purchase or the MYPIN customer service department. Keep your purchase receipt as proof of purchase.
