FANUC A06B-6140-H055 – αi Power Supply Module (aiPS‑55) for 400V CNC Drive Systems

The FANUC A06B-6140-H055 is an αi Power Supply Module commonly identified as aiPS‑55. It’s designed to feed the DC bus for FANUC αi servo and spindle amplifier stacks in 400V-class machine tools. From my experience, this model is picked when you need a reliable, higher-capacity power backbone for machining centers, turning cells, and multi-axis production lines where uptime really matters. You might notice that it drops in cleanly with αi amplifier families and keeps wiring straightforward inside a standard control cabinet.

Company’s Order Placement Process and Guarantees

• Warranty: 365 days
• Delivery: 1 week for in‑stock items; no more than one month at the latest
• Payment: 50% advance payment; full payment prior to delivery
• Express options: FedEx, UPS, DHL

Key Features

• 400V-class αi DC bus supply: Feeds the DC link for FANUC αi servo and spindle amplifiers in medium-to-high power machines.
• aiPS‑55 capacity: The H055 variant is suited for systems with multiple axes or larger spindles, typically where higher regen and bus stability are needed.
• Compact cabinet footprint: Vertical, panel-mounted design for standard CNC electrical enclosures; simplifies retrofit work.
• Integrated protection & diagnostics: Overvoltage/undervoltage protection and alarm signaling for quick fault tracing.
• External regenerative support: Works with external regeneration options when the duty cycle or decel profile demands it.
• Clean compatibility: Designed for FANUC αi amplifier stacks (400V-class), keeping harnessing and commissioning consistent.

Technical Specifications

Application Fields

This aiPS‑55 module is typically used in 400V-class CNCs across:

• Machining centers and horizontal lines with multi-axis servo loads
• CNC turning and mill-turn platforms with medium-to-large spindles
• Grinding and gear cutting where stable bus voltage is crucial
• High-throughput automotive cells and general-purpose metalworking machines

One thing I appreciate is how seamlessly it pairs with αi servo and spindle amplifiers in 400V cabinets—less trial-and-error during commissioning, and in many cases, shorter downtime during a swap. A Tier‑1 shop told us a direct replacement of their A06B-6140-H055 brought the machine back up in under two hours, with only a brief alarm check and thermal settings review.

Advantages & Value

• Reliability under load: Stable DC bus for multi-axis systems, helping avoid nuisance undervoltage trips during aggressive moves.
• Direct compatibility: Built for 400V-class FANUC αi drive stacks—minimal wiring changes in replacements.
• Serviceability: Clear alarm signaling; supports external regen when duty cycles demand higher braking energy.
• Procurement confidence: Tested units and 365-day warranty reduce risk on time-critical repairs.
• Cost control: In many cases, a like-for-like module swap is faster and more economical than reengineering mixed-vendor power solutions.

Installation & Maintenance

• Cabinet & environment: Mount vertically in a clean, enclosed cabinet with forced ventilation. Keep ambient near the unit under 45°C for best life.
• Power wiring: Use 3‑phase 380–480 VAC feed with proper PE grounding. Follow FANUC torque specs and use appropriately rated breakers/EMC filtering.
• Bus connections: Connect DC bus P/N to the αi servo/spindle amplifiers. If your cycle involves heavy decel energy, fit the designated external regen option per the machine maker’s scheme.
• Controls & checks: Verify PWR/ALM signal wiring; after power-up, confirm no overvoltage/undervoltage alarms and that the bus precharge completes normally.
• Routine care: Quarterly dust cleaning, check fans and airflow, inspect terminals for discoloration, and review alarm history. Capacitor health tends to be the limiting factor on older units—plan preventive replacement in high-duty environments.
• Safety: Lockout/tagout before any work; the DC bus retains charge after power-off—wait the specified discharge time and verify with a meter.

Quality & Certifications

• Typically conforms to CE requirements for industrial control equipment
• UL recognition for components is common on this series
• RoHS compliance for most later revisions (varies by production lot)
• Manufacturer’s design emphasizes long service life in 24/7 applications

Model variants and suffixes (e.g., different regen or firmware revisions) can exist. If you’re replacing an installed unit, sharing a photo of the nameplate and cabinet layout typically helps us verify the exact match and confirm any external regen requirements.