FXB-VAC1 Three-Phase Protector Instruction Manual

1. Precautions

• The device must be installed by qualified professionals.
• Before operating the device, disconnect all power supplies; do not touch any terminals when the device is energized.
• After installation, confirm that the terminal connections are correct.
• Disassembly or maintenance of the device is prohibited regardless of whether it is operating normally; the manufacturer and seller shall not be liable for any consequences arising from non-compliance.
• Do not use the device in locations that may be exposed to gas corrosion, direct strong sunlight, or rain.
• Clean the device with a cloth.
• Failure to comply with the above instructions may result in serious personal injury or major accidents.

2. Product Features

• Equipped with protection functions for excessive/low set power supply voltage, three-phase unbalance, and phase sequence error.
• Designed based on a microcontroller, ensuring high stability.
• Digital display of operating voltage and current values for intuitive data viewing.
• Voltage measurement accuracy of 2% (across the entire frequency spectrum).
• Supports parameter setting via buttons for easy operation.
• Equipped with LED indicators to show fault statuses such as overvoltage, undervoltage, and overcurrent.
• Adopts a 6-module specification and supports DIN rail mounting, suitable for industrial installation requirements.

3. Technical Parameters

4. Product Status Statement

• During relay reset/start-up delay counting: If a voltage fault is detected, the output relay will be energized, and the fault indicator LED will light up accordingly.
• During normal operation of the relay: Real-time operating voltage and current values will be displayed on the screen; if a voltage or current fault is detected, the output relay will be energized, and the fault indicator LED will light up accordingly.
• During voltage fault recovery: If the input voltage returns to the threshold (Hys) after a fault, the relay will reset automatically during the counting period, the fault indicator LED will turn off, and the operating voltage and current values on the screen will flash.
• Current trip fault: When the relay fails due to a current trip, it will reset automatically; during the reset/start-up delay period, the fault indicator LED will turn off, and the operating voltage and current values will flash on the screen.
• Phase sequence fault: When an inter-phase fault occurs, the screen displays 'L1-L3-L2', and the protector will disconnect from the output power supply.
• Continuous overcurrent fault: After the continuous overcurrent fault indicator is triggered, the overload device must be disconnected first, and the relay can be restarted only after manual reset.

5. Wiring Instructions

• Wiring diagrams in this manual are for reference only; actual wiring shall be based on the markings on the actual device.
• Real-time voltage operating values are displayed on the screens corresponding to L1, L2, and L3; current values are displayed on the screen corresponding to L2 when the delay timing starts.
• After the delay timing ends, the output relay closes and then opens according to normal logic