Introduction
The MYPIN LM8-RRD Digital Weighing Controller Indicator is a high-precision instrument designed for various weighing and pressure measurement applications. It provides isolated auxiliary power for direct connection of 1-4 load cells and offers multiple output controls for tasks such as group ingredient weighing or fast/slow weighing. This manual provides essential information for the safe and efficient operation of your device.
Key Features
- High precision, steady performance, and easy operation.
- Dual LED nixie tube digits for clear display.
- Supports 1-4 load cell signals input.
- Equipped with 2 RELAY output alarms.
- Isolated auxiliary power (5V/80mA) for load cell connection.
- Functions include clearing zero and PV (Process Value) modification.
- Data and Peak value holding function for choice.
- Compatible with various pressure and weight sensors.
- Suitable for weight control, auto accumulation/mean for up/down batch control.
Specifications
| Parameter | Value |
|---|---|
| Model | LM8-RRD (4 Digits) |
| Display Type | LED Display |
| 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 |
| Item Size | 95 x 85 x 46 mm (3.74 x 3.35 x 1.81 in) |
| Item Weight | 258 g (9.12 oz) |
| Certification | CE |
| Origin | Mainland China |
Safety Information
- Ensure the power supply matches the device's requirements (220V/110V AC).
- All wiring should be performed by qualified personnel to prevent electric shock or damage to the device.
- Do not operate the device in environments with excessive moisture, dust, or corrosive gases.
- Disconnect power before performing any installation, maintenance, or troubleshooting.
Installation and Setup
Mounting
The LM8-RRD controller is designed for panel mounting. Use the provided brackets to secure the device into a suitable cutout in your control panel. Ensure adequate ventilation around the unit.
Wiring Instructions
Refer to the wiring diagram on the device label for correct connections. The main connections are:
- Power Supply (AC 220V/110V): Connect the main power supply to the designated terminals. Verify the voltage matches your local supply and the device's setting.
- Load Cell Input: The device supports 1-4 load cells. Connect the load cell signals to the EXC+, EXC-, SIG+, and SIG- terminals. The instrument provides an isolated 5V auxiliary power for the load cells.
- Relay Outputs (AL1, AL2, OUT, COM): The device features 2 relay outputs. Connect your external control circuits (e.g., alarms, solenoids) to the AL1, AL2, OUT, and COM terminals as required for your application. AL1 and AL2 are typically for alarm outputs, while OUT and COM are for general control.
Ensure all connections are tight and properly insulated. Double-check all wiring before applying power.
Operation
Display Overview
The device features a dual LED display:
- PV (Process Value): The upper red LED display shows the current measured value from the load cell.
- SV (Set Value): The lower green LED display shows the set point or parameter value.
Basic Functions
- Zero Clearing: Use the 'RST' button to clear the current weighing value to zero. This is essential before starting a new measurement or after placing an empty container on the scale.
- PV Modification: The instrument allows for modification of the Process Value (PV). Consult the detailed programming manual (not provided here) for specific steps on how to access and adjust this setting.
- Set Point Adjustment: Use the 'SET' button to enter the parameter setting mode. The '◀' and '▶' buttons are typically used to navigate through parameters and adjust values.
- Data/Peak Value Holding: The device offers a function to hold the current data or the peak value measured. Refer to the full programming guide for activation and usage of this feature.
User Tips
- This item can be utilized effectively as a digital pressure gauge when connected to appropriate pressure sensors.
- For precise measurements, ensure the load cell is properly calibrated and stable before use.
- Regularly check wiring connections for any signs of wear or looseness to maintain accuracy and safety.
Maintenance
- Cleaning: Wipe the device with a soft, dry cloth. Do not use abrasive cleaners or solvents.
- Inspection: Periodically inspect the wiring and connections for any damage or corrosion.
- Environment: Keep the device in a clean, dry environment, free from excessive vibrations or extreme temperatures.
Troubleshooting
- No Display: Check the power supply connection and ensure the correct voltage is applied.
- Incorrect Readings: Verify load cell wiring, ensure the load cell is functioning correctly, and check for proper calibration.
- Relay Not Activating: Confirm that the set points are correctly configured and that the input signal is within the expected range to trigger the relay. Check external relay connections.
- Unstable Readings: Check for electrical interference, loose connections, or mechanical issues with the load cell setup.
Warranty and Support
For warranty information and technical support, please refer to the documentation provided with your purchase or contact the seller directly. Keep your purchase receipt as proof of purchase.