A20B-2101-0051/12G
May 22, 2026

A20B-2101-0051/12G

Model: A20B-2101-0051/12G Type: Servo amplifier control PCB (Beta I servo drive board) Version: 12G hardware revision Manufacturer: FANUC Function: Core control for βi servo amplifiers; handles servo motor drive, current/velocity loop control, encoder signal processing, I/O logic, and fault diagnosis Weight: Approx 0.09–0.20 kg

Description

Specifications

  • Power Supply: DC 5V, DC 24V, DC 200–400V (high-voltage drive)

  • Control Axis: Single-axis servo (βi series)

  • Communication: FSSB optical fiber interface, encoder serial I/F

  • Operating Temp: 0°C to +55°C (non-condensing)

  • Storage Temp: -20°C to +85°C

  • Humidity: 5%–95% RH (non-condensing)

  • Protection: Overcurrent, overvoltage, overtemperature, short circuit, encoder error, IGBT fault

Compatibility

  • Matching Amplifier: A06B-6130-Hxxx (Beta SVI 6130 series servo amplifiers)

  • Applicable CNC: FANUC 0i Mate-MD, 0i-D/F, 30i-B series

  • Applicable Motor: βi series servo motors (e.g., A06B-006x-Bxxx)

Safety Instructions

  1. Cut off all power and wait ≥5 minutes for capacitor discharge before service.

  2. Use an anti-static wrist strap to avoid ESD damage.

  3. No hot-plugging of cables/connectors.

  4. Do not modify onboard circuits.

Installation

  1. Power off the entire machine.

  2. Insert the board into the designated slot and secure screws.

  3. Connect FSSB fiber, encoder, and power cables correctly.

  4. Verify all connectors are locked.

  5. Restore power and test operation.

Maintenance

  1. Clean dust from the PCB surface regularly.

  2. Inspect connectors for looseness or aging.

  3. Check component temperatures during operation.

  4. Keep the cabinet dry and free of oil mist.

Troubleshooting

  1. Amplifier alarm: Check power voltages and board seating.

  2. Communication failure: Reconnect FSSB optical cable.

  3. Abnormal motor rotation: Inspect encoder wiring and signals.

  4. Overtemperature alarm: Clean cooling fan and ventilation paths.


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