EGBO 1-Channel Optocoupler Isolation Module User Manual

1. Introduction

The EGBO 1-Channel Optocoupler Isolation Module is designed for convenient and reliable signal isolation in various electronic applications. It features 5.0 pitch screw terminals for easy wiring and utilizes the PC817/EL817 optocoupler for stable performance and long service life.

This module is ideal for scenarios where a single-chip microcomputer's output level needs to drive inductive components like motors, providing anti-interference protection for the microcontroller's circuits. It also facilitates level matching, such as converting a low microcontroller output voltage to a higher voltage required by modules like PLCs (e.g., 24V inputs). Additionally, it can be used for signal inversion in inverter applications, high voltage detection (e.g., isolating a 12V sensor output for a 5V microcontroller), and current amplification when the microcontroller's output current is insufficient to drive certain circuits.

2. Safety Information

⚠ WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Always ensure proper handling of electronic components. Disconnect power before making any connections or adjustments. Avoid contact with live circuits. If you are unsure about any aspect of installation or operation, consult a qualified professional.

3. Product Overview

The optocoupler isolation module provides electrical isolation between two circuits, preventing high voltages or noise from one circuit from affecting the other. It consists of an input side (LED) and an output side (phototransistor), optically coupled but electrically separated.

Figure 3.1: EGBO 1-Channel Optocoupler Isolation Module with basic wiring diagram.

4. Specifications

Figure 4.1: Physical dimensions and weight of the optocoupler module.

5. Setup Instructions

Before connecting the module, ensure all power sources are disconnected. The module has distinct input and output sections, each with screw terminals for secure connections.

5.1 Wiring Diagram

Figure 5.1: Detailed internal circuit diagram and terminal connections.

5.2 Terminal Connections

• Input Side (J1):
  • IN+: Positive input for the signal.
  • IN-: Negative input for the signal.
• Output Side (J2):
  • VCC: Positive power supply for the output circuit (DC 1.8V-24V).
  • OUT: Isolated output signal.
  • GND: Ground for the output circuit.

Important: The input voltage (DC 3V-5V, 12V, or 24V) must match the specific variant of the module you are using. The output VCC can be a different voltage within the 1.8V-24V range, allowing for level shifting.

Figure 5.2: Top view of the module, highlighting the input and output terminals.

6. Operating Instructions

Once wired correctly, apply power to both the input and output circuits. When a signal is applied to the input terminals (IN+ and IN-), the internal LED will illuminate, activating the phototransistor on the output side. This action will then control the OUT terminal relative to GND on the output side.

• Signal Activation: A positive voltage difference between IN+ and IN- (matching the module's input voltage variant) will activate the optocoupler. The red LED on the module will light up when the input is active.
• Output Control: The OUT terminal will change its state based on the input signal. For example, if used as a switch, the output might go low when the input is active, or high depending on the external pull-up/pull-down configuration on the output side.
• Level Shifting: By supplying a different VCC to the output side, you can shift the voltage level of your signal. For instance, a 5V input signal can control a 12V output circuit.
• Current Amplification: Ensure the input current is within the recommended range (15-20mA for 50mA output) to achieve the maximum output current capability.

7. Maintenance

The EGBO Optocoupler Isolation Module is designed for durability and requires minimal maintenance. Follow these guidelines to ensure its longevity:

• Keep Dry: Protect the module from moisture and humidity, which can cause short circuits and damage.
• Cleanliness: Keep the module free from dust and debris. Use a soft, dry brush or compressed air for cleaning if necessary. Avoid using liquids.
• Temperature: Operate the module within its specified temperature range of -55℃ to 110℃. Avoid extreme heat or cold.
• Physical Protection: Handle the module with care to prevent physical damage to the PCB or components.

8. Troubleshooting

• No Output Signal:
  • Verify that the input voltage applied to IN+ and IN- matches the module's variant (3V-5V, 12V, or 24V).
  • Check the input current. Ensure it is sufficient to activate the internal LED (>1mA).
  • Confirm that the output side VCC and GND are correctly powered (DC 1.8V-24V).
  • Inspect all wiring for loose connections or incorrect polarity.
• LED Indicator Not Lighting Up:
  • Check the polarity of the input signal. IN+ should be positive relative to IN-.
  • Ensure the input voltage is within the specified range for your module variant.
  • Verify the input current is sufficient to light the LED.
• Output Current is Lower Than Expected:
  • For maximum output current (50mA), the input current must be between 15-20mA. Adjust your input circuit if necessary.
  • Ensure the load connected to the output does not exceed the module's maximum output current rating.

9. User Tips

• AC Input Considerations: This module is designed for DC input signals. If you need to isolate an AC signal, you will first need to rectify and filter the AC signal to convert it into a DC signal before feeding it to the module's input. The output voltage will be determined by the VCC supplied to the output side, not directly by the input.
• Protecting RS485 Networks: Yes, this optocoupler module can be effectively used to protect sensitive communication networks like RS485 from high voltage spikes, transient noise, and ground loop issues. The galvanic isolation provided by the optocoupler ensures that electrical disturbances on one side do not propagate to the other.
• Driving Inductive Loads: When driving inductive loads such as motors or relays, consider adding a flyback diode across the inductive load to protect the output transistor of the optocoupler from voltage spikes generated when the load is switched off.

10. Warranty and Support

For technical support or inquiries regarding the EGBO 1-Channel Optocoupler Isolation Module, please contact your retailer or the manufacturer directly. Keep your purchase receipt for any warranty claims. General support for electronic components typically covers manufacturing defects for a limited period from the date of purchase.