Daviteq Latching Solenoid Valve Controller
LSV
New replacement products
Replaced SKU
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1. Introduction
Overview
LSV is a Latching Solenoid Valve Controller to control external Latching Solenoid Valve. This controller will be connected to latching solenoid valve such as HUNTER valve, EARLY BIRD valve. The LSV can be integrated into the wireless transmitter from Daviteq, such as Sub-GHz WS433, LoRaWAN WSLRW, and Sigfox WSSFC, to build the complete Wireless relay output node.
This Latching Solenoid Valve Controller valve is the best choice for an Irrigation System for a Garden, Smart Farm, or Hydroponic Farm. It can be used for FCU in HVAC or any water supply line in a Facility or Building.
Specification
Cable: 2 wires for control pulse of a solenoid valve
Control function: Pulse control (Positive pulse for open control and negative pulse for close control)
Pulse width: Configurable, default of 40ms for HUNTER valve and RAIN BIRD valve
Control mode: Schedule Control, Instant Control, Power-on Control, Fall-back Control
2. Principle of Operation
A latching valve controller works by using a brief electrical pulse to change the valve's state (open or closed). Once the state is changed, it remains in that position without needing continuous power. This is achieved through a mechanism involving a bi-stable solenoid.
Momentary Pulse Activation:
Electrical Pulse:
A short electrical pulse is used to change the state of the valve. This pulse can be either positive or negative, depending on whether you want to open or close the valve.
Polarity: The polarity of the pulse determines the direction of the magnetic field, which in turn changes the state of the valve.
Bi-stable Solenoid:
Solenoid Operation: The solenoid in a latching valve has two stable positions. When an electrical pulse is applied, it moves the solenoid to one of these positions.
Energy Efficiency: Since the solenoid only requires power during the transition between states, it is highly energy-efficient.
Components and Design
Coil Design:
Two-Way Coil: This design uses a single winding and changes the polarity of the current to move the solenoid.
Valve Mechanism:
Plunger and Pole Piece: The attractive force between the plunger and the pole piece is crucial for the valve's operation. The distance between these components (the valve's stroke) affects the efficiency of the valve.
3. Calibration
Calibrating a latching solenoid valve controller involves several steps to ensure accurate and reliable operation. Here's a detailed guide to help you through the process:
Steps for Calibration
Initial Setup:
Power Supply: Ensure the power supply is stable and within the required voltage range for the solenoid valve.
Connections: Verify all electrical connections are secure and correctly configured.
Pulse Duration:
Determine Pulse Length: Identify the optimal pulse duration needed to switch the valve state. This is typically specified in the valve's datasheet.
Test Pulses: Apply test pulses of varying lengths to find the minimum duration that reliably switches the valve.
Polarity Check:
Correct Polarity: Ensure the polarity of the pulses is correct. A positive pulse should open the valve, and a negative pulse should close it (or vice versa, depending on the valve design).
Reverse Polarity: Test the reverse polarity to confirm the valve returns to its original state.
Controller Configuration:
Programming: If using a microcontroller, program it to send the correct pulse duration and polarity based on the desired valve state.
Testing and Adjustment:
Initial Tests: Conduct initial tests to ensure the valve responds correctly to the control signals.
Fine-Tuning: Adjust the pulse duration and timing as needed to achieve consistent operation.
Environmental Considerations:
Temperature and Humidity: Test the valve under different environmental conditions to ensure reliable performance.
Load Conditions: Verify the valve operates correctly under varying load conditions (e.g., different pressures or flow rates).
Tools and Equipment
Oscilloscope: To measure the pulse duration and verify the signal integrity.
Multimeter: To check the voltage and current levels.
Power Supply: Adjustable power supply to provide the necessary voltage for testing.
Microcontroller or Timer Circuit: To generate the control pulses.
4. Application Notes
5. Installation Notes
Installation Notes for Latching Solenoid Valve Controller
1. Preparation:
Power Supply: Ensure the power supply matches the voltage and current requirements of the solenoid valve.
Tools: Gather necessary tools such as a multimeter, screwdriver, wire strippers, and connectors.
2. Mounting:
Location: Choose a clean, dry, and accessible location for the controller.
Secure Mounting: Mount the controller securely using screws or brackets.
3. Electrical Connections:
Polarity: Ensure correct polarity for the electrical connections. Use an H-bridge circuit if needed for polarity reversal.
Wiring: Connect the controller to the solenoid valve using appropriate gauge wires. Secure connections with wire nuts or terminal blocks.
Power Supply: Connect the power supply to the controller, ensuring it is turned off during installation.
4. Configuration:
Pulse Duration: Set the pulse duration on the controller to match the requirements of the solenoid valve.
Programming: If using a programmable controller, configure it to send the correct pulse duration and polarity.
5. Testing:
Initial Test: Turn on the power supply and test the controller to ensure it switches the valve correctly.
Adjustments: Make any necessary adjustments to the pulse duration or configuration settings.
6. Final Checks:
Secure Connections: Double-check all electrical connections to ensure they are secure and properly insulated.
Environmental Conditions: Verify that the installation can withstand the expected environmental conditions (e.g., temperature, humidity).
7. Documentation:
Record Settings: Document the configuration settings and any adjustments made during installation.
Maintenance Schedule: Establish a maintenance schedule to periodically check the controller and valve for proper operation.
6. Troubleshooting
Here are some common issues and troubleshooting steps for latching solenoid valve controllers:
1. Valve Does Not Open or Close:
Check Power Supply: Ensure the power supply matches the voltage and current requirements.
Verify Pulse Duration: Make sure the pulse duration is sufficient to switch the valve state.
Polarity: Confirm the polarity of the pulses is correct.
Inspect Connections: Check all electrical connections for secure and proper wiring.
2. Valve Stays in One Position:
Pulse Strength: Ensure the pulse is strong enough to overcome any resistance.
Mechanical Blockage: Inspect the valve for any debris or mechanical blockage.
3. Inconsistent Operation:
Environmental Conditions: Verify the valve is operating within the specified temperature and humidity range.
Interference: Ensure there is no electromagnetic interference affecting the controller.
Component Wear: Inspect the valve and controller components for wear and tear.
4. No Response from Controller:
Power Supply: Check if the controller is receiving power.
Fuse or Circuit Breaker: Inspect and replace any blown fuses or tripped circuit breakers.
Controller Settings: Verify the controller settings and reprogram if necessary.
5. Valve Makes Unusual Noise:
Loose Components: Tighten any loose components or fittings.
Vibration: Secure the controller and valve to minimize vibrations.
Air in System: Bleed any air from the system to ensure smooth operation.
7. Maintenance
Maintenance of Latching Solenoid Valve Controllers
1. Regular Inspection:
Visual Check: Inspect the controller and valve for any signs of wear, damage, or corrosion.
Connections: Ensure all electrical connections are secure and free from corrosion.
2. Cleaning:
Valve Components: Clean the valve components, such as the plunger, seal, spring, and O-ring, to remove any dirt or debris.
Controller Housing: Keep the controller housing clean and free from dust.
3. Testing:
Functionality Test: Regularly test the valve to ensure it opens and closes correctly with the controller.
Pulse Duration: Verify the pulse duration settings to ensure they are optimal for reliable operation.
4. Environmental Conditions:
Temperature and Humidity: Check that the valve and controller are operating within the specified environmental conditions.
Protection: Ensure the installation is protected from extreme conditions that could affect performance.
5. Component Replacement:
Worn Parts: Replace any worn or damaged parts, such as seals or springs, to maintain optimal performance.
Coil Inspection: Inspect the coil for any signs of burnout or damage and replace if necessary.
6. Documentation:
Maintenance Records: Keep detailed records of all maintenance activities, including inspections, cleanings, tests, and replacements.
Settings: Document the controller settings and any adjustments made during maintenance.
7. Manufacturer Guidelines:
Follow Instructions: Adhere to the manufacturer's maintenance guidelines and recommendations for best results.
Support: Contact the manufacturer for support if you encounter persistent issues.
8. Default Configuration
The LSV has the default configuration, however, those parameters can be changed. The user can change the configuration on the wireless transmitter so that the complete sensor (transducer + wireless) delivers the proper output value. Please check the Payload document for more information