1. General Information

• Model: A06B-6140-H055 (αiPS-55, PSM-55i)

• Type: 3‑phase regenerative power supply module (Alpha i series)

• Manufacturer: FANUC

• Description: High‑power common DC‑bus supply for αiSV servo amplifiers and αiSP spindle amplifiers; supports heavy‑duty CNC machines, large machining centers, and high‑torque spindle applications.

• Function: Provides main motor power + control power to servo units; includes regeneration (feeds deceleration energy back to the line).

• Manual Reference: B‑65282EN

2. Electrical Specifications

• Input: 3‑phase AC 200–240 V ±10%, 50/60 Hz

• Rated Input Current: 228 A @ 200 V

• Rated Input Power: 65 kW

• DC Link Output: 283–339 VDC

• Rated Output Current: 234 A DC

• Regeneration: Built‑in (no external resistor needed)

• Control Power: 24 VDC (internal, for servo logic)

• Cooling: Forced air (internal fan A90L‑0001‑0441#39 + external fan A50L‑0001‑0509)

• Insulation Class: Class H (180 °C)

3. Environmental & Mechanical

• Operating Temp: 0 °C to +55 °C

• Storage Temp: −20 °C to +70 °C

• Humidity: 5–95% RH, non‑condensing

• Altitude: ≤1000 m (derate 1%/100 m above)

• Protection: IP20 (front)

• Mounting: Vertical in cabinet; ≥100 mm clearance top/bottom

• Dimensions (W×H×D): 300 mm × 350 mm × 250 mm

• Weight: Approx. 20 kg (44 lbs)

4. Key Features

• 65 kW high‑power: For large servo/spindle combinations

• Regenerative: Reduces energy waste and heat

• Common DC bus: Synchronizes multiple axes, reduces wiring

• Dual‑fan cooling: Heavy‑duty thermal management

• Built‑in protection: Overcurrent, overvoltage, undervoltage, overtemperature, fan fault, input phase loss

• LED indicators: Power, alarm, DC link ready

• Diagnostics: Real‑time monitoring via FSSB

5. Installation & Wiring

1. Power off: Disconnect all AC power; wait ≥15 minutes for DC bus discharge.

2. Mounting: Secure vertically to rigid rail; maintain airflow clearances.

3. AC input: Connect L1/L2/L3 and PE (protective earth); use 120 mm² cables for 228 A.

4. DC bus: Connect DC+ / DC− to servo/spindle amplifiers; torque terminals to 2.5–3.0 N·m.

5. Control power: 24 VDC to CNC/servo logic.

6. Fans: Verify internal/external fans run on power‑on.

6. Alarm Codes (Common)

• AL‑1: Main circuit overcurrent (short, ground fault, overload)

• AL‑2: Cooling fan stopped (replace fan immediately)

• AL‑3: Heatsink overtemperature (poor ventilation, fan blocked)

• AL‑4: DC link undervoltage (input loss, phase failure)

• AL‑5: Precharge failure (capacitor bank fault)

• AL‑6: Input power abnormal (phase imbalance, voltage drop)

• AL‑7: DC link overvoltage (regeneration overload, faulty servo)

7. Maintenance

• Monthly: Clean air filters; check fan operation (replace if noisy/stuck).

• Quarterly: Torque check on all power terminals; inspect cables for wear.

• Annual: Test regeneration function; check DC bus capacitor ripple.

8. Safety Precautions

• Only qualified electricians may install/service.

• High voltage remains 15+ minutes after power‑off—risk of shock.

• Do not block ventilation—fire/overheating hazard.

• Use only FANUC‑specified cables/connectors.

• Properly ground the module chassis.