Fanuc A14L-0102-0002 CNC Power Supply Module — Technical Reference & Procurement Guide

The Fanuc A14L-0102-0002 is a genuine OEM power supply module from FANUC Corporation, designed to provide regulated DC power to the CNC control unit and associated peripheral circuitry in Fanuc Series-based CNC systems. As a safety-critical component that feeds power to the CNC CPU, memory, I/O interface, and servo command circuitry, the power supply module is one of the highest-impact replaceable units in a Fanuc CNC cabinet — a failed or degraded module causes complete machine downtime and can produce misleading fault symptoms across multiple CNC subsystems.

This guide covers the module's technical specifications, system placement, common failure diagnostics, and selection guidance for engineers and maintenance technicians working with Fanuc CNC equipment.

✅ 100% genuine FANUC product. Brand new. Ready for immediate worldwide shipment.

The Role of the Power Supply Module in a Fanuc CNC System

To understand why correct module identification matters, it helps to understand where the A14L-0102-0002 sits within the Fanuc CNC electrical architecture.

A typical Fanuc CNC cabinet contains several distinct power domains:

1. Main AC power circuit — incoming three-phase or single-phase AC from the machine transformer, feeding the servo amplifiers and spindle drive directly.

2. CNC control power supply (this module's domain) — converts AC mains voltage to regulated low-voltage DC rails (typically +5V, ±15V, +24V) that power the CNC CPU board, SRAM memory, display interface, I/O unit, and manual pulse generator (MPG) circuits.

3. Servo/spindle DC bus — separate high-voltage DC bus within the servo amplifier unit, fed from its own rectifier section.

The A14L-0102-0002 operates in the second domain — it is the control voltage source for the CNC's logic and interface circuitry, not the servo power amplifier. This distinction is critical when diagnosing faults: if the CNC display is blank, the system fails to boot, or multiple axes fault simultaneously at startup, the control power supply is the first component to investigate — before assuming CPU board or servo amplifier failure.

Technical Specifications

Parameter	Specification
Manufacturer	FANUC Corporation
Part Number	A14L-0102-0002
Module Type	CNC Control Power Supply Unit
Input Voltage	200–240V AC (single phase or derived from transformer)
Output Rails	Regulated DC (5V, 15V, 24V — refer to Fanuc technical manual)
Mounting	Rack / cabinet mount, direct backplane connection
Form Factor	Compact plug-in module for Fanuc CNC control unit
Compatible Systems	Fanuc Series 0, Series 16, Series 18, related CNC generations
Cooling	Convection / forced air (cabinet fan dependent)
Certification	CE, UL
Condition	Brand New / Genuine OEM

💡 Note on specifications: FANUC publishes detailed electrical output specifications in the CNC Maintenance Manual for each system series. Engineers requiring confirmed voltage/current ratings for the specific machine should reference the manual for their CNC model (e.g., B-64305EN for Series 0i-F, or the equivalent for their generation). Contact our team if you need the relevant document reference.

Fanuc Part Number Structure — Understanding A14L-0102-0002

Fanuc part numbers follow a structured format that encodes the product category and revision:

A 14L - 0102 - 0002
│ │ │ └─ 0002: Revision / sub-variant identifier
│ │ └────────── 0102: Base model / circuit design identifier
│ └──────────────────── 14L: Product category code (power supply / PSU module series)
└───────────────────────── A: Fanuc component prefix (standard hardware module)

The "14L" category code is Fanuc's designation for control power supply units within the CNC cabinet architecture. This distinguishes them from "06B" prefix parts (servo amplifiers), "06B-0" prefix (servo motors), and "02B" prefix (CNC CPU boards). When searching for this part or verifying a substitute, the category code is the first cross-check point — a power supply and a servo amplifier will never share the same "14L" or "06B" prefix.

Compatible CNC Systems and Machine Applications

The A14L-0102-0002 power supply module is associated with Fanuc Series 0, Series 16, and Series 18 CNC controller generations, which were deployed extensively in the following machine types:

Vertical machining centers (VMC) — 3-axis and 4-axis configurations with Fanuc Series 0-MC or 16-M control
CNC turning centers and lathes — Fanuc Series 0-TC, 16-T, and 18-T control variants
Horizontal machining centers (HMC) — larger 4/5-axis configurations with Fanuc 16/18-M
CNC grinding machines — precision axis control with Fanuc Series 0-GC
Injection molding machines — Fanuc Series 0-PB / 18-PB variants
Wire EDM machines — Fanuc Series 0-WA/WB

⚠️ Always verify against your machine's CNC model plate before ordering. The correct way to confirm PSU compatibility is to match the part number exactly from the existing module's label inside the CNC cabinet — not from the machine's external model designation alone.

Diagnosing Power Supply Module Failure in Fanuc CNC Systems

Because the control power supply feeds multiple subsystems simultaneously, its failure is often misdiagnosed as a CPU fault, memory fault, or I/O fault. The following diagnostic sequence helps engineers confirm whether the PSU module is the root cause before ordering a replacement.

Step 1 — Check the CNC power-on sequence. Apply AC power and observe the sequence. If the CNC display never illuminates (not even briefly), and the servo ready signal is not asserted, the control power supply is the primary suspect. A partial boot followed by a specific alarm (e.g., 910-series SRAM alarm) points more toward battery/memory issues.

Step 2 — Measure the DC output rails. With a multimeter, measure the DC output voltages at the power supply module's output connectors or at the CNC backplane test points specified in the maintenance manual. Voltages significantly outside the rated tolerance (typically ±5% for logic rails) confirm PSU degradation or failure.

Step 3 — Check the LED indicators on the PSU module. Most Fanuc power supply modules include status LEDs. A red fault LED or absent green "power good" LED indicates the module has detected an internal fault condition — this is a direct indication of PSU failure rather than a downstream load fault.

Step 4 — Isolate the load. If DC voltages are low, briefly disconnect peripheral loads (I/O unit, MPG, display) one at a time to determine whether a shorted load is pulling down the supply. If voltages recover when a specific load is disconnected, that load — not the PSU — is the failed component.

Step 5 — Swap test with known-good unit. If the above steps are inconclusive, a direct swap with a known-good A14L-0102-0002 is the definitive diagnostic. If the system boots normally with the replacement module, the original PSU has failed internally.

Common Fanuc CNC Alarms Associated with PSU Failure

Alarm / Symptom	Description	Relation to PSU
Blank display, no boot	CNC fails to initialize	Direct — +5V supply absent
910 / 911 SRAM parity error	Memory fault on startup	Possible — insufficient +5V causes corrupt read
5V LED off on CNC unit	DC status indicator fault	Direct — 5V rail failed
Servo ready not established	Axes remain in E-stop after boot	Possible — control power not stable
Random multi-axis faults	Multiple axes fault simultaneously	Possible — noisy or intermittent DC supply
Watchdog alarm (e.g., 930)	CPU watchdog timeout	Possible — unstable 5V causing CPU reset cycle

Note that alarms 910, 911, and 930 can also be caused by failing SRAM backup battery, CNC CPU board faults, or memory module issues. The PSU should be confirmed as the root cause through voltage measurement before replacement.

Why Genuine Fanuc Parts Matter for the Power Supply Module

The power supply module is not a component where cost-optimization through third-party alternatives carries an acceptable risk profile. The reasons are architectural:

Every DC voltage rail from the PSU directly powers Fanuc's proprietary CNC CPU, SRAM memory, and servo command hardware. Non-Fanuc PSU units may produce nominally correct voltage under no-load conditions but fail to maintain voltage regulation under the transient load demands of a Fanuc CNC boot sequence, servo enable cycle, or rapid axis command burst. The consequence of under-voltage or ripple on the 5V rail during operation is not a clean fault alarm — it is unpredictable memory corruption, random axis faults, and CNC control behavior that is difficult to diagnose and may result in machine crashes or workpiece damage.

For safety-critical and production-critical CNC systems, a genuine Fanuc A14L-0102-0002 from a verified supplier is the only appropriate replacement specification.

Procurement and Shipping Information

🔒 100% genuine FANUC Corporation product — factory new with original labeling
✅ Not refurbished, not repaired, not third-party compatible
🔍 Part number verified against physical module label before dispatch
📦 Anti-static and shock-resistant industrial packaging
🌍 Worldwide express shipping (DHL, FedEx, UPS)
⚡ In-stock orders dispatched within 1–2 business days

Technical FAQ — Fanuc A14L-0102-0002 Power Supply Module

Q1: Which Fanuc CNC systems is the A14L-0102-0002 compatible with? The A14L-0102-0002 is primarily associated with Fanuc Series 0, Series 16, and Series 18 CNC controller generations used in VMC, lathe, turning center, and grinding machine applications from the 1990s through early 2000s. Compatibility must be confirmed by matching the part number against the existing module's label inside the CNC cabinet — the machine's external model designation is not sufficient for PSU part number confirmation. Contact our team with your machine builder, CNC model, and existing PSU label details for a compatibility check before ordering.

Q2: How do I confirm the A14L-0102-0002 is the correct replacement for my machine? Open the CNC cabinet and locate the power supply module. The module will have a Fanuc part number label — typically on the front face or side of the module housing. Confirm the label reads "A14L-0102-0002" exactly. If the label reads a different part number (e.g., A14L-0102-0001, A14L-0104-0001), that is a different revision or capacity variant and the correct part number should be ordered instead. Never order based solely on physical appearance.

Q3: What symptoms indicate the A14L-0102-0002 has failed? The most definitive indicators are: (1) the CNC display does not illuminate at all after power-on; (2) DC output voltages measured at the module outputs are outside specified tolerance (typically more than 5% below nominal); (3) the module's fault LED is illuminated or the power-good LED is absent; (4) the CNC intermittently fails to boot or produces random alarms that clear on power cycle. Random multi-axis faults and SRAM parity alarms (910/911) can also indicate a degraded PSU, though these should be differentiated from battery and memory faults before PSU replacement.

Q4: Can a third-party or generic power supply be used as a substitute? This is strongly not recommended for Fanuc CNC control power supply applications. The Fanuc CNC CPU, SRAM, and servo command circuitry have specific transient load regulation requirements that generic industrial PSUs are not characterized or tested against. A substitute that passes static voltage measurement may still fail under the dynamic load conditions of a CNC boot cycle or rapid servo command burst, causing unpredictable control behavior including potential axis crashes. Genuine Fanuc A14L-0102-0002 units are the only specification that guarantees compatibility with the CNC's internal power architecture.

Q5: Does replacing the A14L-0102-0002 require any software or parameter reconfiguration? No — the power supply module is a purely electrical component with no software, firmware, or stored parameters. Replacement is a direct mechanical and electrical swap: disconnect the AC input and DC output connectors, unmount the module, install the new unit, reconnect, and power on. No CNC parameter changes, axis calibration, or software updates are required as a result of PSU replacement alone. However, if the PSU failure caused SRAM data corruption (indicated by 910/911 alarms persisting after PSU replacement), a parameter restore from backup may be required.

Q6: How does the A14L-0102-0002 differ from Fanuc servo amplifier power supply modules like the A06B-6110 series? These are fundamentally different products serving different power domains. The A14L-0102-0002 is a low-voltage DC control power supply — it powers the CNC's logic circuits (CPU, memory, I/O interface) at voltages such as +5V, ±15V, and +24V. The A06B-6110 series (PSM — Power Supply Module) is a high-voltage AC-to-DC converter that generates the servo bus DC voltage (typically 280–325V DC) driving the servo amplifier IGBT stages. These two module types are not interchangeable and serve completely separate electrical functions within the CNC cabinet. Ordering the wrong type will result in a module that physically does not connect to your system.

Q7: Is an expedited shipping option available for machine-down situations? Yes. For production machines that are stopped due to PSU failure, we offer priority processing and next-flight-out express shipping arrangements. Contact us immediately via WhatsApp with your machine details, existing PSU part number, and delivery location — our team will confirm part availability, compatibility, and the fastest shipping option to your facility.

CNC cabinet open and not sure which module has failed? Share your CNC model, alarm display, and a photo of the existing PSU module label — our technical team will confirm the correct part number and arrange the fastest possible shipment.

A14L-0102-0002 Fanuc A14L01020002 Fanuc Power Supply Module Genuine New