Technical Reference for Fanuc A06B Servo Amplifiers and Drive Modules
Fanuc servo drives (servo amplifiers) are essential components for industrial robots, controlling robot axes motion, torque, and precise positioning.
This index provides a comprehensive overview of the main Fanuc servo drive types, A06B part numbers, applications, and replacement guidance. It is designed to help maintenance engineers and procurement teams quickly identify and source the correct Fanuc drive modules to minimize downtime.
Why Fanuc Servo Drives Matter
Fanuc servo drives interface between the robot controller and servo motors, ensuring:
- Axis motion execution and torque control
- Feedback processing from encoders
- Synchronization across multiple axes
- Safety and emergency stop integration
Drive failures can result in:
- Persistent servo alarms (e.g., ALM 11, ALM 14, ALM 18).
- Axis motion loss or instability
- Reduced production efficiency
- Unexpected robot downtime
A structured servo drive indexhelps reduce troubleshooting time and ensures proper spare parts management.
Main Categories of Fanuc Servo Drives
1. Alpha i Series (A06B-611x / 612x)
The flagship high-precision servo platform used in medium-to-heavy FANUC robots such as M-710 and R-2000 series.
Typical configurations include single-axis and dual-axis SVM modules.
Representative models
- A06B-6110-H101 Alpha i SVM1-20i (Single Axis, 200V)
- A06B-6114-H205 Alpha i SVM2-20/20i (Dual Axis, 200V)
- A06B-6120-H002 Alpha i High-Voltage Series (400V)
Typical failure signs
- Axis servo alarms
- Encoder signal loss
- Overtemperature shutdown
- Drive ready signal missing
2. Beta i Series (A06B-613x / 616x)
Compact and cost-optimized drives typically used in smaller robots, auxiliary axes, or integrated controller cabinets.
Representative models
- A06B-6130-H002 Beta i SVU1-20
- A06B-6160-H001 Beta i SVM for R-30iB Plus
Typical applications
- Light-payload robots
- Positioners and tracks
- Auxiliary servo axes
3. Alpha i All-in-One Amplifiers (A06B-6200 Series)
Integrated drive platforms combining:
- Power Supply Module (PSM)
- Servo Amplifier (SVM)
- Spindle Module (SPM)
These units are common in newer R-30iB controllers and reduce cabinet wiring complexity.
Typical configurations
- 3-axis integrated drive
- 6-axis integrated drive units
4. Technical Selection Table
| Drive Type | Part Prefix | Typical Application | Voltage |
|---|---|---|---|
| Alpha i SVM | A06B-6114 | High-payload R-2000 series | 200V |
| Alpha i HV | A06B-6120 | 400V High-Voltage Systems | 400V |
| Beta i SVU | A06B-6130 | Auxiliary axes & small robots | 200V |
| Integrated | A06B-6200 | R-30iB Compact Cabinets | Multi |
Cooling Fans & Auxiliary Modules
Servo drive reliability depends heavily on thermal management.
Representative spare parts
- A06B-6102-H001 Servo Drive Cooling Fan
- A06B-6103-H001 Cabinet Air Filter
Maintenance warning signs
- Overheating alarms
- Loud fan vibration
- Dust-clogged filters
- Drive temperature spikes
Replacing cooling components early often prevents amplifier failure.
Signs a Fanuc Servo Drive Needs Replacement
Typical indicators include:
- Persistent Servo Alarms: Faults on one or more axes that cannot be cleared.
- Loss of Motion: Axis cannot move despite the motor being functional.
- Electrical Faults: Frequent overcurrent or overvoltage warnings.
- Communication Failure: Inability to communicate with the controller.
- Physical Damage: Burn marks on the board, broken connectors, or fan failure.
Repair vs Replacement Strategy
Board-level repair is recommended when
- Only the control board is faulty
- Drive power stage remains intact
- Downtime must be minimized
Full drive replacement is recommended when
- Internal components are heavily damaged
- The drive is obsolete
- Stable long-term production is critical
A structured spare-parts strategy ensures faster recovery from servo failures.
Servo Drive Spare Parts by Robot Brand
Different robot manufacturers use dedicated servo drive architectures and compatibility standards.
Select your robot brand below to browse matching servo drive spare parts, improve repair efficiency, and reduce unexpected downtime.
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ABB Servo Drives Explore servo drive units compatible with ABB IRC5 and OmniCore robot controllers.
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FANUC Servo Drives Find original and replacement servo amplifiers for FANUC R-30iA, R-30iB, and related systems.
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KUKA Servo Drives Browse KUKA KPP and KSP drive modules designed for KRC2 and KRC4 controller platforms.
- Yaskawa Servo Drives View Yaskawa servo drive solutions for NX100, DX200, and YRC1000 robot controllers.
FAQ - Fanuc Servo Drives
Q: What do "U" or "L" status codes mean?
A: These usually indicate the drive is waiting for communication from the CPU. Check your FSSB (Fanuc Serial Servo Bus) fiber optic cables and 24V power.
Q: Will replacing the amplifier delete my programs?
A: No, programs are stored in the CPU. However, if the Pulse Coder batteries are disconnected, you will likely need to re-master (zero) the robot axes.
Q: Can I swap Alpha i with Beta i?
A: No. They use different voltage specs, physical footprints, and connectors. Always match the A06B-XXXX-XXXX part number exactly.
Related Fanuc Index Pages
- Fanuc Control Boards & Modules Index
- Fanuc Part Number Index
- Robot Servo Motors & Encoders Index
- Robot Power Supply Units Index
- Robot Communication Boards Index
Reference Notes
Identification: Always verify the silver label. A part number like A06B-6114-H105#N has a specific software suffix (#N) that may be critical for certain robot models.
Safety: The DC Bus remains charged at 300V+ even after power is removed. Do not touch terminals until the "Charge" LED is completely off.