The A06B-6079-H304 is a three‑axis Alpha series servo amplifier (SVM3‑20/20/20) for compact, multi‑axis CNC and automation systems. It controls three independent servo axes with a shared power stage, connecting to FANUC CNC via the FSSB optical bus (Type A interface) for noise reduction and simplified wiring.

Rated DC input voltage: 283–325 VDC. Rated input power: 3.7 kW. Control power: 24 VDC ±10%.

Maximum output voltage: 230 VAC three‑phase. Rated continuous output current: 5.9 A for L‑axis, 5.9 A for M‑axis, 5.9 A for N‑axis. Compatible with FANUC Alpha servo motors such as α6/3000, α8/3000 and similar low‑to‑medium power models.

Operating temperature: 0°C to +55°C. Storage temperature: ‑40°C to +85°C. Humidity: 10%–90% RH, non‑condensing.

Dimensions: 380 mm (H) × 90 mm (W) × 307 mm (D). Weight: approximately 3.9–5 kg.

High‑performance digital servo control with HRV3 ensures precise position, speed, and torque regulation for three axes simultaneously. The FSSB optical interface eliminates electrical interference and supports long‑distance communication. A built‑in regenerative circuit manages deceleration energy efficiently. Integrated protection functions include overcurrent, overvoltage, undervoltage, overtemperature, and overload. An internal cooling fan maintains stable operation under continuous load. It supports both incremental and absolute encoders and is compatible with FANUC 0i, 16i, 18i, 30i/31i/32i series CNC. No S1/S2 jumpers are present on this three‑axis model.

Install vertically in a well‑ventilated control cabinet. Maintain a minimum 100 mm clearance around the unit for proper airflow. Secure the amplifier with mounting screws to prevent vibration during operation.

Connect the DC link input (283–325 VDC) from the power supply unit to the DC terminals. Run 24 VDC control power and emergency stop signals to the CX1A/CX1B connectors.

For each axis, connect motor power cables U, V, W, and ground to the corresponding motor terminals. Attach encoder cables to the feedback connectors. Use shielded cables for all signal lines and ensure proper earthing to minimize electrical noise.

Disconnect all power before installation or maintenance. Wait at least five minutes after power‑off for DC link capacitors to fully discharge. Never touch high‑voltage terminals to avoid electric shock. Use only specified fuses such as A06B-6077-K250. Repeated alarm trips indicate a fault; inspect wiring, motors, and amplifier before restarting. Keep the unit away from flammable materials and corrosive gases.

Alarm 1: Internal fan stopped (FAL). Alarm 2: Low control power voltage (LV5V). Alarm 5: Low DC link voltage (LVDC). Alarm 8: L‑axis overcurrent (HCL). Alarm 9: M‑axis overcurrent (HCM). Alarm A: N‑axis overcurrent (HCN). Alarm b: L & M‑axis overcurrent. Alarm C: M & N‑axis overcurrent. Alarm d: L & N‑axis overcurrent. Alarm E: All three axes overcurrent. Alarms IPML, IPMM, IPMN: IPM module faults (short circuit or overheating) on L‑, M‑, N‑axis respectively.

Regularly inspect the cooling fan for proper operation and clean dust from the fan and heat sink. Verify all terminal screws are tight and cables are undamaged. Keep the heat sink free of debris to ensure efficient heat dissipation. Use only FANUC original replacement parts. Refer to manual B‑65165E for detailed maintenance procedures.

Ideal for three‑axis compact CNC machines such as small machining centers, lathes, grinders, and multi‑axis rotary tables. Suitable for applications requiring high acceleration, smooth rotation, and accurate positioning with low‑to‑medium power demands.