Keenso 2-Channel Relay Module User Manual

1. Introduction

This manual provides detailed instructions for the Keenso 2-Channel Relay Module. This module is designed for controlling various electrical devices with a low-level trigger signal, making it suitable for integration with microcontrollers like Arduino, Raspberry Pi, 8051, AVR, PIC, DSP, ARM, and MSP430. It features optocoupler isolation for stable performance and offers flexible voltage options.

Image 1.1: Overview of the Keenso 2-Channel Relay Module.

2. Product Features

• Humanized Interface Design: All interfaces can be directly connected via terminal cables for convenience.
• Easy Installation: Equipped with four fixed screw holes for simple mounting.
• Microcontroller Compatibility: Standard interface directly controllable by microcontrollers (e.g., Arduino, Raspberry Pi, 8051, AVR, PIC, DSP, ARM, MSP430, TTL logic).
• Stable Performance: Utilizes high-quality relays with normal interface and a maximum load of AC 250V/10A, DC 30V/10A.
• Optocoupler Isolation: SMT optocoupler isolation provides strong driving capability and stable performance.
• Low Trigger Current: Trigger current is 5mA.
• Flexible Trigger Levels: Modules can be activated by setting high or low levels via jumpers.
• Error-Tolerant Design: Ensures the relay remains stable even if the control line is interrupted.
• Status Indicators: Features a green power indicator and two red relay status indicators.
• Multiple Voltage Options: Available in 5V, 12V, and 24V operating voltages.
• Compact and Reliable: Designed for easy integration into projects with high-quality components for reliable and long-lasting performance.

3. Specifications

Package List: 1 * Keenso 2-Channel Relay Module

Image 3.1: Keenso 2-Channel Relay Module with key dimensions.

4. Component Identification

4.1. Relay Output Terminals

Image 4.1: Detailed view of relay output terminals.

1. NO1: Normally Open interface for Channel 1 relay. The relay is open before activation and short-circuited with COM1 after activation.
2. COM1: Common interface for Channel 1 relay.
3. NC1: Normally Closed interface for Channel 1 relay. It is short-circuited with COM1 before relay activation and open after activation.
4. NO2: Normally Open interface for Channel 2 relay. The relay is open before activation and short-circuited with COM2 after activation.
5. COM2: Common interface for Channel 2 relay.
6. NC2: Normally Closed interface for Channel 2 relay. It is short-circuited with COM2 before relay activation and open after activation.

4.2. Power and Control Input Terminals

Image 4.2: Detailed view of power and control input terminals.

1. S1: Jumper for high/low-level trigger selection for Channel 1 relay.
2. S2: Jumper for high/low-level trigger selection for Channel 2 relay.
3. DC+: Connect to the positive pole of the power supply.
4. DC-: Connect to the negative pole of the power supply.
5. IN1: Signal trigger terminal for Channel 1. Can be set for high or low-level control for relay activation.
6. IN2: Signal trigger terminal for Channel 2. Can be set for high or low-level control for relay activation.

5. Setup and Wiring

Before connecting the module, ensure all power sources are disconnected to prevent electrical shock or damage to components.

5.1. Power Supply Connection

• Connect the DC+ terminal to the positive (+) output of your power supply (e.g., 12V DC for this model).
• Connect the DC- terminal to the negative (-) output (ground) of your power supply.
• The green power indicator LED will illuminate when power is correctly supplied.

5.2. Load Connection

Each relay channel has three terminals: Normally Open (NO), Common (COM), and Normally Closed (NC). Choose the appropriate connection based on your application requirements.

• Normally Open (NO) Configuration: For a device that should be OFF when the relay is inactive and ON when the relay is activated, connect one side of your load to the NO terminal and the other side to your power source. Connect the COM terminal to the other side of your power source.
• Normally Closed (NC) Configuration: For a device that should be ON when the relay is inactive and OFF when the relay is activated, connect one side of your load to the NC terminal and the other side to your power source. Connect the COM terminal to the other side of your power source.

5.3. Control Signal Connection

• Connect your microcontroller's output pin to the IN1 terminal for Channel 1 or IN2 for Channel 2.
• Ensure the microcontroller's ground is connected to the relay module's DC- terminal for common ground reference.

6. Operating Instructions

6.1. Trigger Level Selection (S1, S2 Jumpers)

The module supports both high-level and low-level trigger modes, selected via the S1 and S2 jumpers for each channel.

• High-Level Trigger: When the jumper is set to 'High' (usually by connecting the jumper to the 'H' pin), the relay will activate when a high voltage signal (e.g., 3.3V or 5V, depending on your microcontroller's logic level) is applied to the IN terminal.
• Low-Level Trigger: When the jumper is set to 'Low' (usually by connecting the jumper to the 'L' pin), the relay will activate when a low voltage signal (e.g., 0V or ground) is applied to the IN terminal.

Important: Always ensure the trigger level selected by the jumper matches the output logic of your controlling device (microcontroller).

6.2. Relay Activation

• Once power and control signals are connected, apply the appropriate trigger signal (high or low, as configured) to the IN1 or IN2 terminal.
• The red relay status LED for the corresponding channel will illuminate when the relay is activated.
• You should hear a distinct click sound as the relay switches state.

Image 6.1: Example of a relay module used in an industrial control environment.

7. Maintenance

• Keep Clean: Regularly inspect the module for dust or debris. Use a soft, dry brush or compressed air to clean.
• Environmental Conditions: Operate the module within its specified temperature and humidity ranges. Avoid exposure to moisture, extreme temperatures, or corrosive environments.
• Connection Integrity: Periodically check all wiring connections to ensure they are secure and free from corrosion. Loose connections can lead to intermittent operation or damage.
• Power Supply Stability: Ensure a stable and clean power supply. Voltage fluctuations can affect performance and lifespan.

8. Troubleshooting

• Relay Not Activating:
  • Check power supply: Ensure the correct voltage (5V, 12V, or 24V, matching your module) is applied to DC+ and DC-.
  • Verify trigger level: Confirm the S1/S2 jumper setting (high or low) matches the signal from your microcontroller.
  • Check control signal: Use a multimeter to verify that the IN1/IN2 pins are receiving the expected trigger signal.
  • Common ground: Ensure the ground of your control device is connected to the DC- terminal of the relay module.
• Power LED Not On:
  • Check power connections: Ensure DC+ and DC- are correctly wired and receiving power.
  • Verify power supply: Test your power supply to ensure it is providing the correct voltage.
• Relay Clicking Continuously/Erratic Behavior:
  • Signal noise: Ensure your control signal is clean and free from electrical noise. Add a capacitor across the power lines if necessary.
  • Incorrect trigger level: Double-check the S1/S2 jumper setting.
• Load Not Switching:
  • Check load wiring: Ensure the load is correctly connected to the NO/COM or NC/COM terminals.
  • Verify relay activation: Confirm the red status LED illuminates and you hear the click when the relay is triggered.
  • Load compatibility: Ensure the load's voltage and current do not exceed the relay's maximum ratings (AC 250V/10A; DC 30V/10A).

9. Safety Information

• Electrical Hazard: This module deals with electrical currents. Always disconnect power before making or changing any connections.
• Voltage Compatibility: Ensure the operating voltage of the module (5V, 12V, or 24V) matches your power supply. Using an incorrect voltage can damage the module.
• Load Limits: Do not exceed the maximum current and voltage ratings of the relays (AC 250V/10A, DC 30V/10A). Overloading can cause damage, overheating, or fire.
• Proper Insulation: Ensure all high-voltage connections are properly insulated to prevent short circuits and electrical shock.
• Professional Installation: If you are unfamiliar with electrical wiring, seek assistance from a qualified electrician or electronics professional.
• Keep Away from Water: Do not expose the module to water or high humidity.

10. Product Applications

The Keenso 2-Channel Relay Module is versatile and can be used in various applications, including:

• Home automation systems
• Industrial control systems
• DIY electronics projects
• Robotics
• Automotive applications
• Lighting control

Image 10.1: Examples of product applications in industrial and electronic settings.

11. Warranty and Support

Keenso products are manufactured to high-quality standards. For warranty information or technical support, please refer to the seller's policy on the purchase platform or contact Keenso customer service directly through their official channels. Please have your product model number (B07PY7LF9Z) and purchase details ready when seeking support.