NUZEZCJG A30 Relay Switch Controller

1. Introduction

The NUZEZCJG A30 Relay Switch Controller is a versatile device designed for DC voltage detection and relay control. It features a digital display for clear voltage readings and two buttons for easy operation. This controller can be used as a voltage detection switch, a battery over/under voltage protector, or a discharge meter. It supports an adjustable voltage detection range from DC 0V to 99.9V and operates within a DC 6V to 80V power supply range.

2. Safety Information

• Power Supply: Ensure the input voltage is within the specified DC 6V to 80V range. Exceeding this range may damage the device.
• Wiring: Always disconnect power before making any wiring connections. Incorrect wiring can lead to device malfunction or electrical hazards.
• Load Current: For electric loads above DC 60V, ensure the load current is less than 10A to prevent damage to the relay contacts due to high voltage DC electric arc.
• Environment: Do not expose the device to moisture, extreme temperatures, or corrosive environments.

3. Product Overview

The A30 controller features a digital LED display, two control buttons (SET and ENTER), and terminal blocks for power and relay connections. It comes with a protective case.

Figure 3.1: Front view of the A30 Controller, showing the digital display, SET and ENTER buttons, and terminal labels for Volt+, GND, Power+, NC, COM, NO.

Figure 3.2: Internal view of the A30 Controller circuit board, highlighting the 30A relay, high-voltage power chip, and terminal connections for Voltage+ (DC 0-99.9V), GND, and Power+ (DC 6-80V).

Figure 3.3: Dimensions of the A30 Controller, measuring 9.4cm (3.7in) in length, 5.2cm (2.04in) in width, and 3cm (1.18in) in height.

4. Specifications

5. Setup and Installation

Carefully follow the wiring diagrams below for proper installation. Ensure all power sources are disconnected before making connections.

5.1 Terminal Connections

• Volt+: Input for voltage detection (DC 0-99.9V).
• GND: Common ground connection.
• Power+: Power supply input for the controller (DC 6-80V).
• NC (Normally Closed): Relay contact that is closed when the relay is de-energized and open when energized.
• COM (Common): Common terminal for the relay contact.
• NO (Normally Open): Relay contact that is open when the relay is de-energized and closed when energized.

5.2 Wiring Diagrams

Figure 5.1: Wiring diagram for charging protection. The relay controls AC power to a charger, which then charges a battery. The controller monitors the battery voltage.

Figure 5.2: Wiring diagram for battery discharge, over/low voltage protection. The controller monitors a 6-60V battery and controls a load based on the detected voltage.

Figure 5.3: Illustration of the time delay relay function. The controller supports adjustable on and off delay times from 0s to 999s.

6. Operating Instructions

The A30 controller is operated using the 'SET' and 'ENTER' buttons located below the digital display.

6.1 Basic Operation

• Power On: Connect the DC 6-80V power supply to the 'Power+' and 'GND' terminals. The LED display will illuminate, showing the current detected voltage.
• Voltage Display: The digital display continuously shows the voltage detected at the 'Volt+' terminal.

6.2 Setting Voltage Limits and Delay

The controller allows setting upper and lower voltage limits, and a detection sampling delay. Specific button press sequences are required to enter programming mode and adjust these parameters.

• Entering Setting Mode: Press and hold the 'SET' button for a few seconds until the display changes, indicating entry into the parameter setting mode.
• Navigating Parameters: Use the 'SET' button to cycle through different parameters (e.g., upper voltage limit, lower voltage limit, delay time).
• Adjusting Values: Use the 'ENTER' button to adjust the value of the currently selected parameter. Repeated presses or holding the button may increase/decrease the value.
• Saving Settings: After adjusting all desired parameters, press and hold the 'SET' button again, or wait for a timeout, to save the settings and exit the programming mode.
• Detection Sampling Delay: This parameter (0.1 to 0.9 seconds) determines the sensitivity and response time of the voltage detection. Adjust as needed for your application.

7. Maintenance

• Cleaning: Keep the device clean and free from dust. Use a soft, dry cloth for cleaning. Do not use liquid cleaners or solvents.
• Inspection: Periodically inspect wiring connections to ensure they are secure and free from corrosion. Check the device for any signs of physical damage.
• Environmental Conditions: Ensure the operating environment remains within the specified temperature and humidity ranges to prolong the device's lifespan.

8. Troubleshooting

• No Display/No Power:
  • Check the power supply connection to 'Power+' and 'GND'.
  • Verify the input voltage is within DC 6-80V.
  • Ensure the power supply is active.
• Incorrect Voltage Reading:
  • Verify the 'Volt+' and 'GND' connections are correct and secure to the voltage source being measured.
  • Check for any loose wires or poor contacts.
• Relay Not Activating/Deactivating:
  • Confirm that the set upper and lower voltage limits are appropriate for the desired operation.
  • Check the 'COM', 'NO', and 'NC' wiring for the load.
  • Ensure the load current does not exceed the relay's maximum rating, especially for DC loads above 60V (max 10A).
  • Verify the detection sampling delay setting.
• Buttons Unresponsive:
  • Ensure the device is powered on.
  • Briefly disconnect and reconnect power to reset the device.