A20B-2101-0390
May 22, 2026

A20B-2101-0390

Model: A20B-2101-0390 Type: Alpha I series servo/spindle amplifier power supply PCB (PSM control board) Manufacturer: FANUC Function: Provides stable DC power for αi servo/spindle amplifiers; integrates noise filter, regenerative energy management, voltage monitoring, and fault protection. Weight: Approx 0.47 kg Status: Discontinued; available as new surplus, refurbished, or used.

Description

Specifications

  • Input Voltage: 400–480V AC (3-phase)

  • Output Voltage: DC 200–400V (high-voltage DC bus)

  • Auxiliary Power: DC 5V, DC 24V

  • Communication: FSSB optical fiber interface (15 Mbps)

  • Display: 7-segment LED for status & fault codes

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

  • Storage Temp: -20°C to +60°C

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

  • Protection: Overvoltage, overcurrent, short circuit, overtemperature, regenerative overvoltage.

Compatibility

  • Matching Amplifier: A06B-6110, A06B-6111, A06B-6114 (Alpha I series)

  • Applicable CNC: FANUC 0i, 16i, 18i, 21i, 30i-B, 0i-TF/0i-MF

  • Applicable Motor: αi series servo and spindle motors.

Safety Instructions

  1. Power off and wait ≥5 minutes for capacitor discharge before service.

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

  3. No hot-plugging of power or fiber cables.

  4. Do not modify onboard circuits or jumpers.

Installation

  1. Shut down main power and lockout/tagout.

  2. Mount the board in the designated slot and secure screws.

  3. Connect 3-phase AC input, DC bus output, FSSB fiber, and 24V auxiliary power.

  4. Verify all connectors are fully seated and locked.

  5. Restore power and check LED status; test for normal operation.

Maintenance

  1. Clean dust from PCB and connectors quarterly.

  2. Inspect connectors for looseness, corrosion, or aging.

  3. Check LED fault codes during operation; address alarms promptly.

  4. Keep cabinet dry and free of oil mist.

Troubleshooting

  1. No LED power: Check 3-phase AC input and 24V auxiliary supply.

  2. Overvoltage alarm: Verify input voltage; check regenerative resistor.

  3. Overcurrent alarm: Inspect DC bus short circuit or amplifier fault.

  4. FSSB communication loss: Reconnect fiber; check for damage or bend radius.


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