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

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.

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.