FANUC A06B-6114-H303 Alpha i Series Three-Axis Servo Amplifier Module
The FANUC A06B-6114-H303 Alpha i Series Three-Axis Servo Amplifier Module (SVM3-20/20/20i) is a compact, high-performance drive component found in numerous smaller CNC machine tools built after the early 2000s. This 60mm-wide module controls three axes (L, M, and N) simultaneously, delivering 6.5A per axis to connected Alpha i servo motors from a single DC bus input.
Module Overview and Application
As part of FANUC's modular Alpha i servo drive system, the A06B-6114-H303 takes DC bus power from the paired PSM (power supply module) and drives three servo axes. Its compact 60mm width makes it ideal for space-constrained electrical cabinets in compact machining centers, CNC lathes, and wire EDM machines. The module communicates via FSSB (FANUC Serial Servo Bus), a high-speed fiber optic interface that simplifies cabinet wiring and enables multi-axis synchronized motion.
Technical Specifications
| Parameter | Value |
|---|
| Part Number | A06B-6114-H303 |
| Model Designation | SVM3-20/20/20i |
| Series | FANUC Alpha i (αi) - 6114 Series |
| Module Type | Three-Axis Servo Amplifier Module |
| Number of Axes | 3 (L-axis, M-axis, N-axis) |
| Rated Input Voltage | 283-339 V DC |
| Rated Input Power | 7.5 kW |
| Rated Output Current | 6.5 A per axis (L, M, N) |
| Peak Output Current | 20 A |
| Peak Output Power | 30 kW |
| Output Voltage | 200-240 V AC |
| Output Frequency Range | 0.1-400 Hz |
| Input Frequency | 50/60 Hz |
| Width | 60 mm |
| Dimensions | 195 * 300 * 220 mm |
| Weight | Approx. 2.6 kg |
| Operating Temperature | 0 °C to +55 °C |
| Humidity | Up to 90% RH (non-condensing) |
| Wiring Board | A16B-2203-0698 |
| Control PCB | A16B-2101-004x |
| Interface | FSSB (FANUC Serial Servo Bus - fiber optic) |
| Manufacturer | FANUC Corporation, Japan |
Space-Saving Design Advantage
The SVM3-20/20/20i's 60mm cabinet width provides significant space savings compared to using three separate single-axis SVM units. This compact design is essential for machine tool builders working with tight electrical cabinet dimensions. The module includes an internal cooling fan and heatsink, eliminating the need for external forced-air cooling in standard installations.
Compatible CNC Controls
The A06B-6114-H303 requires FSSB interface compatibility and works with these FANUC CNC generations:
- FANUC 0i-B and 0i-C - Most widely deployed FANUC CNCs globally
- FANUC 16i, 18i, 21i (model B generation) - Higher-function CNCs for capable machining centers
- FANUC 15i - High-end CNC for complex multi-axis machining
- FANUC Robot Controls - Robot controllers using Alpha i drive architecture
Compatible Servo Motors
This module is designed for FANUC Alpha i series small-capacity motors, typically the αi4 and αi8 series. These standard feed axis motors are commonly found on compact machining centers and CNC lathes where the 6.5A per axis rating adequately serves X, Y, and Z axis requirements.
Alarm Reference Guide
| Alarm Code | Condition |
|---|
| 1 | Internal cooling fan stopped |
| 2 | Low control power voltage (5V supply) |
| 5 | Low DC link voltage |
| 6 / b | Inverter overheat |
| F | External cooling fan stopped |
| P | FSSB communication error |
| 8 | L-axis overcurrent |
| 9 | M-axis overcurrent |
| A | N-axis overcurrent |
| b | L & M-axis overcurrent |
| C | M & N-axis overcurrent |
| d | L & N-axis overcurrent |
| E | L, M, N all-axis overcurrent |
| 8. | L-axis IPM alarm |
| 9. | M-axis IPM alarm |
| A. | N-axis IPM alarm |
Application Environment
The A06B-6114-H303 is commonly deployed in:
- Compact vertical machining centers (400-600mm travel range)
- CNC turning centers with 2-3 servo axes
- Wire-cut EDM machines
- Drilling and tapping centers
- Smaller horizontal machining centers
The 6.5A per axis rating adequately serves the Alpha i feed motor requirements for X, Y, and Z axes on these machine types.
Internal Board Architecture
The module features two main internal boards: the wiring board (A16B-2203-0698) handling power transistor stages and motor outputs, and the FSSB control card (A16B-2101-004x) managing servo loop computation and CNC interface. While the boards are not available separately, component-level repair is feasible for internal cooling fans, battery packs, fuses, and transistor modules at specialized FANUC service facilities.
Frequently Asked Questions
What is the FSSB interface and does the A06B-6114-H303 require it?
FSSB (FANUC Serial Servo Bus) is FANUC's fiber optic high-speed serial interface between the CNC and servo amplifier modules. The A06B-6114-H303 exclusively uses FSSB and is not compatible with older Type A or Type B analog interfaces. Verify FSSB compatibility with your FANUC CNC before specification.
Which servo motors are compatible with the A06B-6114-H303?
Designed for FANUC Alpha i series small-capacity motors, this module typically pairs with αi4/3000 and αi8/3000 models. These standard feed axis motors match the 6.5A rated output per axis. Motors requiring higher current need single-axis SVM modules with larger current ratings.
Can one A06B-6114-H303 replace three separate single-axis SVM1 modules?
Functionally yes, provided each axis requires no more than 6.5A rated current (20A peak). The SVM3-20/20/20i handles three axes in one 60mm module with the same FSSB interface and motor compatibility, offering substantial cabinet space reduction. The trade-off is that a single module failure affects all three axes simultaneously.
What does alarm code P mean and how should I troubleshoot it?
Alarm P indicates an FSSB communication error in the fiber optic serial data link. First inspect FSSB optical fiber cables for connector damage, contamination, or excessive bending. Clean optical connectors if necessary. If the alarm persists, the fault may be in the module's FSSB control card or CNC servo interface, requiring specialized diagnosis.
Is the A06B-6114-H303 still in production and is it repairable?
The A06B-6114-H303 belongs to FANUC's Alpha i (6114 series) generation, which has been superseded by newer drives and is no longer in current production. However, it remains widely available through industrial automation channels as surplus and refurbished stock. Component-level repair is well-supported with available service parts for internal cooling fans, transistor modules, fuses, and battery packs.
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