Fanuc A06B-0116-B203 AC Servo Motor
βiS 1/6000, 6,000 RPM, Keyed Shaft, B64iA Absolute Encoder
Product Overview
Part Number: A06B-0116-B203
Also Searched As: A06B0116B203, FANUC A06B-0116-B203, Fanuc Beta iS servo motor BIS1/6000
Motor Model: βiS 1/6000 (Beta iS 1/6000)
Classification: Fanuc Beta iS Series AC Brushless Servo Motor -- 0.5 kW, 6,000 rpm, Straight Shaft with Keyway, No Brake, B64iA Absolute Encoder, IP65
Technical Specifications
| Parameter |
Value |
| Part Number |
A06B-0116-B203 |
| Motor Model |
βiS 1/6000 |
| Rated Output |
0.5 kW |
| Maximum Speed |
6,000 rpm |
| Motor Input Voltage |
172V (3-phase) |
| Current |
1.8 A (rated) / 2.6 A (peak) |
| Phases |
3-phase |
| Encoder |
B64iA (absolute, 64,000 ppr) |
| Shaft Type |
Straight with keyway (ST, KEY) |
| Electromagnetic Brake |
None |
| Protection Rating |
IP65 |
| Insulation Class |
Class F |
| Operating Temperature |
0°C to +40°C |
| Compatible Amplifiers |
Fanuc βi series servo amplifiers (βiSV) |
| Compatible Controls |
Fanuc Series 0i, 16i, 18i, 21i, 30i, 31i, 32i |
| Origin |
Japan |
Performance Advantages
Six Thousand RPM in Half a Kilowatt
The 6,000 rpm ceiling enables fast axis positioning with light loads. On a 5mm pitch ball screw in direct coupling, this delivers 30 m/min of linear traverse—matching the rapid traverse capability of larger alpha series motors while drawing only 1.8 amps at rated conditions.
The 0.5 kW rated output is correctly sized for secondary positioning axes, ATC mechanisms, compact lathe feeds, and small machining center axes cutting aluminum and non-ferrous materials. This motor exceeds the 5,000 rpm ceiling of comparable Fanuc αiF 1/5000 motors, providing enhanced productivity for applications where axis traverse time limits cycle performance.
Keyed Shaft for Positive Torque Transmission
The straight shaft with keyway provides positive mechanical engagement for torque transmission, preventing micro-slip in high-reversal applications. This ensures consistent positioning accuracy over thousands of direction reversals per shift. When replacing this motor, confirm the coupling hub has a matching keyed bore.
B64iA Absolute Encoder for Immediate Startup
The B64iA absolute encoder delivers 64,000 pulses per revolution with multi-turn position retention through power-off events. This eliminates homing cycles after power-up, allowing immediate automatic operation. At 64,000 counts per revolution on a 5mm pitch ball screw, the position loop closes at approximately 78 nanometers per count—adequate resolution for drill-tap positioning, gang-tool slide positioning, and compact VMC feed axis control.
No Brake Configuration for Horizontal Axes
The no-brake configuration is correct for horizontal axes where position at rest is maintained by the βiSV amplifier's servo lock. This keeps the motor compact and lighter than braked variants while eliminating brake circuit complexity. For vertical axis applications, specify the braked variant A06B-0116-B576.
IP65 Sealing for CNC Environments
Standard IP65 protection provides dust resistance and protection against directed water jets. For applications with direct coolant exposure, the A06B-0116-B203#0100 variant upgrades to IP67 sealing with identical performance specifications.
Series Comparison
The βiS series provides cost-optimized performance compared to the αiF series. While the αiF 1/5000 carries a higher-resolution A1000 encoder (1,000,000 ppr), the βiS 1/6000 reaches 6,000 rpm versus the αiF's 5,000 rpm ceiling. The two families are not interchangeable due to different encoder protocols, amplifier families, and parameter sets.
Compatibility Information
Operates with Fanuc βi series servo amplifiers (βiSV)—specifically the βiSV 4 for this 0.5 kW power class. Compatible CNC platforms include Fanuc Series 0i-D, 0i-F, 16i, 18i, 21i, 30i-A, 30i-B, 31i-A, 31i-B, and 32i. Not compatible with αiSV amplifiers.
Typical Applications
- Compact CNC machining center and drill-tap feed axes - X, Y, and Z drives on small-format VMCs and drill-tap centers
- Gang-tool CNC lathe axes - X and Z slide drives on gang-tool turning machines
- CNC grinding machine feed axes - Infeed and traverse drives on small CNC grinding machines
- ATC mechanism and tool magazine drives - Tool magazine indexing and ATC arm position drives
Frequently Asked Questions
What is the difference between the standard B203 and the B203#0100 sealed variant?
The base B203 carries IP65 protection against dust and directed water jets. The #0100 upgrades to IP67, adding resistance to temporary coolant immersion and direct flood exposure. All performance specifications remain identical.
The motor has an absolute encoder—why does the axis still home on power-up?
Check the backup battery in the βiSV amplifier—a depleted battery resets the multi-turn counter. Also verify CNC axis parameter 1815#4 (APC bit) is set to absolute mode.
Can this motor be driven by an αiSV amplifier instead of a βiSV?
No. The αiSV is designed for Alpha i motors with different parameter sets and current ratings. The correct paired drive is the βiSV 4.
What are the most common failure modes, and is the motor repairable?
B64iA encoder failure from coolant mist contamination and bearing wear are most common. Both are repairable by qualified servo motor facilities through encoder or bearing replacement.
Can the keyed shaft B203 replace a smooth shaft B078 directly?
No. The shaft type determines the coupling interface. A keyed shaft requires a hub with a matching keyway bore. Confirm the original motor's shaft configuration before ordering replacement.
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