FANUC A06B-6089-H104 Servo Amplifier Unit

The FANUC A06B-6089-H104 Servo Amplifier Unit is a single-axis AC servo amplifier from the FANUC α (Alpha) series, designed for CNC machine tool and automation applications. It drives the servo motor with HRV high-response vector control, delivering precise speed and torque regulation for axes such as X, Y, and Z on machining centers and lathes.

Key Features

• Single-axis servo amplifier for α / αi series motors (small-to-medium power)
• HRV (High Response Vector) control for fast dynamic response and precise speed/torque regulation
• FSSB (FANUC Serial Servo Bus) fiber-optic communication with 0i-series and other FANUC CNCs
• Three-phase 200–230 V AC input, 50/60 Hz
• 12.5 A rated output current (L axis) with 230 V AC maximum output
• Characteristic FANUC yellow enclosure with grey AC SERVO front cover
• Conforms to VDE 0160

Technical Specifications

• Type Designation: A06B-6089-H104
• Product Type: Single-axis AC servo amplifier (α series)
• Input Voltage: 200–230 V AC, three-phase, 50/60 Hz
• Input Current: 13.4 A at 200 V
• Max. Output Voltage: 230 V AC
• Rated Output Current: 12.5 A (L axis)
• Control Method: HRV high-response vector control
• Communication: FSSB fiber-optic serial bus
• Motor Compatibility: FANUC α / αi series servo motors
• Weight: 5.0 kg
• Standards: VDE 0160
• Origin: Japan

Installation Notes

1. Isolate the CNC’s main power and discharge the DC link before handling the amplifier.
2. Mount the unit in the electrical cabinet with adequate clearance for airflow; verify heatsink ventilation is unobstructed.
3. Connect three-phase line power to the main input terminals, the servo motor power cable to the U/V/W output, and the motor encoder cable to the connector on the front panel.
4. Route the FSSB fiber-optic cable from the CNC controller to the amplifier’s FSSB connector; observe bend radius and cleanliness of the fiber ends.
5. After power-up, confirm the amplifier status LED sequence and clear any alarm codes (e.g., axis alarm) via the CNC diagnostics screen.

Common Questions

Which FANUC CNC systems is this amplifier compatible with?

The A06B-6089-H104 communicates via FSSB and is typically paired with FANUC 0i / 16i / 18i / 21i series CNCs. Confirm the FSSB connection count and axis parameter settings for your specific control before retrofitting.

Is this a single-axis or dual-axis amplifier?

Single-axis. The H104 designation identifies a one-axis unit with 12.5 A rated output; dual-axis units in the 6089 family carry different suffixes (e.g., -H3xx) with two output stages.

What is the rated output current?

12.5 A for the L axis at 230 V AC maximum output voltage. Do not exceed the nameplate rating when sizing the servo motor.