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| Place of Origin | JAPAN |
| Brand Name | FANUC |
| Certification | CE ROHS |
| Model Number | A06B-0116-B855#0048 |
Part Number: A06B-0116-B855#0048
Series: Beta iSR (βiSR) — Robot-Grade AC Servo Motor
Model: BiS 1 / 6000
Configuration: Straight Shaft with Keyway, 90V DC Spring-Applied Brake, Absolute Encoder
Rated Output: 0.5 kW
Motor Input: 172 V, 1.8 A
Maximum Speed: 6,000 RPM
Poles: 8 Phase: 3-Phase
Amplifier Input: 200–240 VAC, 50/60 Hz
Ingress Protection: IP67
Application: Industrial Robot Wrist/Arm Axis
Condition: New / Refurbished
The Fanuc A06B-0116-B855#0048 is a Beta iSR series AC servo motor — model BiS1/6000 — specifically configured for industrial robot applications.
The "R" designation in the iSR series marks this as a robot-grade variant of the standard Beta iS motor, with modifications to the sealing, connector, and mechanical construction that address the installation and environmental demands of robotic arm joints rather than standard machine tool axes.
At 0.5 kW, 172V motor input, 1.8A rated, and 6,000 RPM maximum speed, this is a compact high-speed motor — the BiS1/6000 is among the smaller end of the Beta iS family in output, but the 6,000 RPM ceiling reflects the high angular velocities that robotic wrist and arm joints require for rapid positioning of light end-effectors.
The #0048 suffix combination identifies the specific configuration with the IP67 sealed construction and the connector arrangement used in Fanuc's robot series.
Two features define this motor's installation context: the straight keyed shaft that provides positive mechanical engagement for the robot's internal transmission components, and the 90V DC spring-applied brake — a specification that distinguishes this motor from the standard Beta iS series motors where brakes run at 24V DC.
The 90V brake is the Alpha-series brake voltage, and its presence on this Beta iSR motor is a deliberate design choice for the robot application class where holding torque requirements and brake coil response characteristics differ from those of CNC machine tool axes.
| Parameter | Value |
|---|---|
| Rated Output | 0.5 kW |
| Motor Input Voltage | 172 VAC |
| Rated Current | 1.8 A |
| Maximum Speed | 6,000 RPM |
| Phase | 3-Phase |
| Poles | 8 |
| Amplifier Input | 200–240 VAC, 50/60 Hz |
| Shaft Type | Straight with Keyway |
| Brake | 90V DC Spring-Applied |
| Encoder | Absolute Pulsecoder (iSR series) |
| Ingress Protection | IP67 |
| Application | Industrial Robot — Fanuc βiSR Series |
| Part Number Suffix | #0048 (IP67 sealed, robot connector) |
The standard Beta iS compact servo range prioritises torque within a 2,000–3,000 RPM working envelope. The BiS1/6000 is a different balance: 0.5 kW at up to 6,000 RPM, with the higher speed ceiling serving the specific kinematic requirements of robotic joints where light-weight links must be repositioned at high angular velocities between work positions.
A robot wrist axis during high-speed pick-and-place or arc welding path traversal may need to rotate through a defined angle in a fraction of a second.
The speed at which the motor can achieve and sustain the commanded angular velocity directly affects cycle time. At 6,000 RPM through the robot's reduction gearbox, the BiS1/6000 delivers the positioning speed that makes tight cycle time targets achievable — while the absolute encoder provides position continuity through power interruptions so the robot does not require a reference return on restart.
The 8-pole design at 172V motor input gives the BiS1/6000 its combination of compact rotor size, adequate torque for its output class, and the electrical frequency characteristics compatible with the Beta i servo amplifier's current control bandwidth. At 6,000 RPM and 8 poles, the fundamental electrical frequency is 400 Hz — the upper end of the beta iS amplifier's operating range for this motor class.
The keyway on the A06B-0116-B855#0048 shaft provides positive rotational engagement between the motor shaft and the robot's internal harmonic drive or cycloidal reducer.
In robot joints where the transmission ratio between motor and joint output is fixed and high — harmonic drives commonly offer ratios of 50:1 to 160:1 — the motor shaft must transmit the full motor torque into the reducer input reliably, without any possibility of rotational slip.
A plain slick shaft relying on friction clamping alone would carry the risk of slip at the motor-reducer interface under the shock loading that rapid direction reversals and high-acceleration positioning cycles impose.
The keyway provides a positive mechanical interlock: the key engages both the shaft keyway and the reducer input hub keyway, creating a rotational lock independent of the hub clamping force.
The hub clamping force provides axial retention and radial concentricity; the key provides the rotational engagement that cannot slip regardless of the torque loading magnitude or the number of direction reversals.
For a robot axis that may execute millions of positioning cycles over its working life, this reliability of torque transmission interface is not a marginal consideration — it is a fundamental requirement of the mechanical design.
The 90V DC brake on the A06B-0116-B855#0048 is the most immediately distinctive specification compared to the standard Beta iS motor series, where brakes use 24V DC.
The 90V specification matches the brake voltage used on Fanuc's Alpha series servo motors, and its use here in a Beta iSR robot motor reflects the robot application's specific holding torque and response requirements.
Robot joints that are gravity-loaded — wrist and elbow joints on a vertical-articulated robot carrying an end-effector — require the brake to hold the joint position reliably whenever the servo is de-energised.
The brake holding torque must exceed the maximum gravitational torque the joint experiences at any arm configuration. The 90V DC coil design achieves the required holding torque within the compact envelope of the BiS1/6000 frame, where a 24V coil at the same holding torque would require a larger coil or a different spring preload arrangement.
The 90V supply must come from the robot controller's brake power supply circuit, which is designed for this voltage in Fanuc robot systems that use this motor family.
Connecting this motor to a 24V brake supply produces the same critical failure mode as connecting any 90V brake coil to 24V: the electromagnetic force is insufficient to overcome the spring, the brake remains partially engaged, the motor runs against continuous brake drag, and both the brake and the motor bearing sustain progressive thermal and mechanical damage. Before any installation, confirm the robot controller's brake supply voltage is 90V DC.
The #0048 suffix identifies the specific construction variant with IP67 sealing and the connector configuration used in Fanuc's robot-series wiring harness.
IP67 provides complete dust exclusion and protection against temporary immersion — substantially stronger than the IP65 standard on most CNC machine tool servo motors — reflecting the operating environment of a robot arm that may operate in coolant-rich manufacturing cells, spray washing stations, or other environments where the motor body may receive direct fluid impingement.
The IP67 designation requires that both the motor body seal and the encoder connector engagement are correctly assembled and maintained.
The feedback connector provides IP67 performance only when fully and correctly engaged — a partially seated connector creates a gap that allows fluid ingress to the encoder, producing feedback errors or encoder alarm codes. Robot installation and maintenance procedures must include confirmation that all connectors are fully engaged and locked before operation.
The A06B-0116-B855#0048 is designed for use in Fanuc industrial robot systems, driven by the Beta i servo amplifier within the robot controller — the βiSVSP or equivalent module in the robot's axis amplifier rack.
It is a robot-axis motor rather than a machine tool feed axis motor, and its parameters are configured through the robot controller's servo parameter system rather than through a CNC machine tool's servo setting screen.
The encoder fitted to the #0048 is an absolute type appropriate to the robot's startup behaviour — the robot re-establishes its joint positions from the absolute encoder data at power-up without requiring a mastering or reference return procedure, provided the encoder battery (in robots that use battery-backed absolute encoders) is maintained within service life.
Q1: Why does this Beta iS motor have a 90V brake instead of the 24V DC brake found on most Beta iS models?
The A06B-0116-B855#0048 is a Beta iSR series motor — "R" denoting a robot-application variant. Fanuc's industrial robot controllers supply 90V DC to the joint brakes, matching the brake voltage used in the Alpha-series servo motors also found in robot applications.
The 90V brake coil design achieves the holding torque required for robot joint gravity loads within the compact BiS1/6000 frame. Connecting this motor to a 24V supply leaves the brake partially engaged — the spring is not overcome, and the motor will sustain damage from continuous brake drag.
Q2: What is the difference between the A06B-0116-B855#0048 and a standard BiS1/6000 Beta iS CNC motor?
The core electromagnetic design — rated output, speed, voltage, current — is the same. The differences are in the construction and configuration for robot use: IP67 sealing (vs IP65 on standard CNC motors), 90V brake (vs 24V on standard Beta iS CNC variants), the #0048 connector arrangement matching Fanuc robot wiring harnesses, and the straight keyed shaft suited to robot internal reducer interfaces.
A standard Beta iS1/6000 CNC motor cannot be directly substituted in a robot installation because its brake voltage, sealing, and connector configuration differ.
Q3: What does the #0048 suffix mean?
The #0048 suffix identifies a specific variant combination — in the Fanuc Beta iSR series, this suffix designates the IP67 sealed construction with the particular connector configuration used in Fanuc robot controllers.
It is not interchangeable with other suffix variants that may carry different connector layouts, sealing levels, or brake specifications.
When ordering a replacement motor for a Fanuc robot, the full part number including the #0048 suffix must be matched to ensure mechanical and electrical compatibility with the robot's wiring harness and control system.
Q4: What amplifier and robot controller is the A06B-0116-B855#0048 compatible with?
This motor is designed for use within Fanuc industrial robot systems — the robot controller provides the servo amplifier function through its internal βiSVSP or equivalent axis amplifier module. It is not configured for direct use with standalone CNC machine tool servo amplifiers without the appropriate parameter and wiring configuration.
The specific Fanuc robot models that use this motor series include those in the compact articulated robot range that uses the Beta iS/iSR motor generation. Confirm the robot model against the motor part number in Fanuc's robot spare parts documentation before ordering.
Q5: What are the most important checks when evaluating a used A06B-0116-B855#0048?
Test the brake first: apply 90V DC and confirm the shaft rotates freely with no drag; remove the 90V and confirm the shaft locks firmly.
A brake that does not fully release at 90V indicates brake coil degradation or mechanical wear; one that does not hold firmly indicates brake pad or spring failure. Inspect the shaft keyway for wear or deformation from previous reducer installation.
Check the IP67 encoder connector for pin condition and correct connector seating — a partially disengaged robot motor connector is the most common cause of encoder alarm codes in robot service. Measure winding resistance for phase balance and insulation resistance to earth.
A run-up test on a compatible Fanuc robot controller at incremental speeds with absolute encoder position verification is the correct final check before returning the motor to service.
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