Fanuc A06B-0372-B171 | ALPHA Series AC Servo Motor
α2/2000 -- 0.4kW, Taper Shaft, Brake, Serial C Encoder
Part Number: A06B-0372-B171
Series: ALPHA AC Servo Motor
Model: α2 / 2000
Configuration: Tapered Shaft (Standard), Spring-Applied Brake, Serial C Pulse Coder (40,000 ppr), IP67
Status: Discontinued by Manufacturer -- Refurbished & Surplus Stock Available
Condition: Refurbished / Surplus
Product Overview
The Fanuc A06B-0372-B171 is a compact ALPHA series AC servo motor featuring a tapered shaft, integrated spring-applied brake, and Serial C pulse coder for position and velocity feedback. Rated at 0.4 kW continuous output with 2 Nm stall torque and 2,000 RPM maximum speed, this motor is designed for smaller, high-cycle secondary axes in machine tools and automation equipment where compact dimensions, fail-safe position holding, and reliable feedback are essential.
Technical Specifications
| Rated Output | 0.4 kW |
| Stall Torque | 2 Nm |
| Stall Current | Approx. 3.5 A |
| Rated Current | 2.2 A |
| Motor Voltage | 120 V (3-phase) |
| Rated Frequency | 133 Hz |
| Maximum Speed | 2,000 RPM |
| Encoder | Serial C Pulse Coder -- 40,000 ppr (A860-0356-T101) |
| Shaft Type | Tapered (Standard) |
| Brake | Spring-Applied, 90V DC |
| Ingress Protection | IP67 |
| Insulation Class | F |
| Series | ALPHA -- α2/2000 |
| Status | Discontinued by Manufacturer |
Compact Torque Performance
The α2 torque class represents the smallest in the standard ALPHA servo motor lineup, making it ideal for light feed axis loads, compact rotary tables, tool magazine indexing mechanisms, and sub-axes of small machine tools. With modest 2.2A rated current requirements, this motor pairs efficiently with the SVM1-12 amplifier module.
Tapered Shaft Design
The precision tapered shaft creates a self-centering interference fit for optimal coupling alignment and positioning repeatability. This engineering feature ensures consistent performance even at the motor's 2 Nm torque capacity, though proper installation torque and professional removal procedures are essential to maintain shaft integrity.
Spring-Applied Brake System
Featuring a fail-safe spring-applied, electrically-released brake system that engages automatically during power loss or shutdown. The 90V DC brake supply provides reliable position certainty for auxiliary positioning axes and indexing mechanisms. Proper voltage verification is critical during installation to prevent damage.
Serial C Pulse Coder
Equipped with the early-generation Serial C encoder (A860-0356-T101) providing 40,000 pulses per revolution. This incremental encoder requires homing sequences at startup and specific amplifier configuration. Direct replacement with this exact encoder type is strongly recommended to maintain system compatibility.
Environmental Protection
IP67-rated housing provides complete protection against dust ingress and temporary immersion, making this motor suitable for challenging industrial environments with coolant mist and cleaning operations. Regular inspection of shaft seals is recommended for motors with extended service histories.
Drive & Control Compatibility
Compatible with Fanuc ALPHA series SVM servo amplifiers, specifically the SVM1-12 module, and integrates with Fanuc CNC controls including Series 0, 0i, 15, 16, 18, and 21. Proper parameterization for the α2/2000 with Serial C encoder is essential for operation.
Frequently Asked Questions
What distinguishes the B171 from B175 and B177 variants?
All three variants share identical electrical specifications but differ in encoder type. The B171 uses Serial C (40,000 ppr), while B175 uses A64 absolute and B177 uses I64 incremental encoders (both 64,000 ppr). Direct substitution requires amplifier compatibility verification and parameter adjustments.
How does Serial C encoder compare to I64?
Serial C provides 40,000 ppr resolution using Fanuc's earlier interface protocol, while I64 offers 64,000 ppr with later interface technology. Both are incremental encoders requiring homing. The critical factor is amplifier support for the specific encoder interface.
What amplifier is required for this motor?
The SVM1-12 (A06B-6096-H101) servo amplifier module is specified for the α2/2000. The amplifier must be parameterized for this motor type with Serial C encoder and verified for Serial C interface support, especially in upgraded systems.
Why is brake voltage critical during installation?
The 90V DC brake specification must be strictly followed. Lower voltages cause partial engagement and thermal damage, while higher voltages burn the coil. Always verify the machine's brake supply voltage before connecting the motor.
What are key inspection points for used units?
Test brake function with 90V DC, inspect taper shaft for damage, check IP67 shaft seal condition, examine encoder connector for corrosion, measure winding resistance for phase balance, and verify insulation resistance. Bench testing with compatible amplifier completes verification.
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