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Key Technical Specifications
| Parameter | Specification |
| Manufacturer | B&R Industrial Automation |
| Model Code | 8MSA4S.R0-31 |
| Motor Type | 3-Phase Permanent Magnet Synchronous Servo Motor |
| Flange Size (Size 4) | 100 mm Flange |
| Stator Length | Short (Length S) |
| Rated Speed | 3000 RPM nominal rating |
| Feedback System | Robust Resolver Feedback (R0) |
| Shaft Design | Smooth cylindrical shaft (no keyway) |
| Holding Brake | Without integrated mechanical holding brake |
| Degree of Protection | IP65 Standard Enclosure |
| Electrical Connection | Dual circular angle plug receptacles (Power & Feedback) |
| Operating Temperature | -15°C to +40°C |
Product Introduction & Supply Chain Strategy
The B&R 8MSA4S.R0-31 is a high-dynamic, three-phase synchronous AC servo motor engineered to pair with B&R ACOPOS, ACOPOSmicro, and ACOPOSmulti drive systems. Featuring a Size 4 frame (100 mm flange) with a length S stator stack, this motor delivers impressive continuous torque and rapid acceleration in demanding industrial applications such as packaging machines, metalworking feeds, plastics machinery, and printing lines.
Equipped with a heavy-duty analog resolver (“R0” designation), the 8MSA4S.R0-31 handles extreme mechanical shock, high structural vibration, and elevated operating temperatures where fragile optical encoders fail. An unexpected motor failure on an automated feed axis halts production immediately. Stocking a factory-fresh, New Surplus 8MSA4S.R0-31 unit in facility inventory guarantees zero rotor magnet demagnetization, factory bearing integrity, and rapid replacement without waiting on long OEM manufacturing lead times.
Installation & Alignment Guide
1.Stage 1: Pre-Installation (Prep & Safety):Safety Prep & LOTO.
- Lock out main electrical power to the ACOPOS drive cabinet and verify DC bus rail voltage is fully discharged (< 50 VDC).
- Inspect the 100 mm pilot flange, smooth shaft, and circular electrical connectors for transit damage or contamination.
- Ensure keyless clamping elements or couplings match the motor shaft diameter precisely and are free of grease/lubricants.
2.Stage 2: Removal:Mechanical Extraction.
- Twist the bayonet locking collars counter-clockwise to disconnect power and resolver feedback cables.
- Loosen clamping bolts on the driven load coupling or gearbox input sleeve.
- Remove the 4 flange mounting bolts and carefully slide the motor straight off the pilot without applying axial impact to the shaft.
3.Stage 3: Mechanical & Electrical Connection:Mounting & Coupling Setup.
- Align the 8MSA4S.R0-31 pilot flange onto the machine mounting faceplate and insert the smooth shaft into the clamping sleeve.
- Cross-torque mounting flange bolts to specified torque ratings using a calibrated torque wrench.
- Secure keyless coupling clamping bolts, ensuring zero axial loading or radial binding on the motor bearings.
- Connect circular power and resolver cables until bayonet locking rings snap firmly into place.
4.Stage 4: Drive Initialization & Testing:Drive Commutation & Test Run.
- Apply 24 VDC logic power to the ACOPOS servo drive; confirm resolver signal detection without feedback fault codes.
- Verify motor parameter table settings in B&R Automation Studio software match the 8MSA4S.R0-31 nameplate rating.
- Perform a low-speed manual jog test to confirm proper rotation direction, correct commutation angle, and smooth acceleration.
8MSA4S.R0-31
8MSA4S.R0-31
Firmware/Software Integration & Resolver Notes
- Automation Studio Compatibility: Fully supported across all releases of B&R Automation Studio via standard ACOPOS motor catalog hardware definitions.
- Resolver Feedback Reliability: Analog resolver feedback units contain no optical glass scales or onboard microelectronics. Sinusoidal/cosinusoidal analog position signals provide extreme immunity against electrical noise, thermal stress, and high physical shock.
- Cable Shielding Requirement: Always utilize factory-terminated, double-shielded B&R motor power and resolver cables. Proper grounding of cable braids at the drive ground bar prevents high-frequency PWM switching noise from interfering with analog resolver signals.
Frequently Asked Questions (FAQ)
Q: What do the “R0” and “31” designators signify in the 8MSA4S.R0-31 model code?
A: “R0” indicates an analog resolver feedback device for high-vibration environments. “31” specifies a smooth cylindrical shaft design without a keyway and without an internal mechanical holding brake at a 3000 RPM nominal rating.
Q: Is the 8MSA series directly compatible with current ACOPOS drive families?
A: Yes. The 8MSA motor family pairs directly with standard B&R ACOPOS, ACOPOSmicro, and ACOPOSmulti drive modules when configured with the appropriate resolver interface card (e.g., 8AC120.60-1).
Q: Why choose New Surplus over a refurbished or rewound servo motor?
A: Rebuilt motors often suffer from degraded permanent magnets (caused by past over-temperature events) and altered stator insulation. Our New Surplus inventory delivers 100% unused hardware with factory magnet flux, pristine bearings, and factory-aligned feedback devices.
Q: Is this 8MSA4S.R0-31 motor guaranteed authentic B&R manufacture?
A: Yes. All stock is guaranteed original B&R equipment. Each unit undergoes visual, shaft rotation, and electrical winding continuity verification prior to dispatch.
Q: What degree of ingress protection does this motor offer?
A: The standard housing provides IP65 protection, sealing the motor against dust ingress and low-pressure water jets from any direction.
Q: What warranty applies to this New Surplus B&R servo motor?
A: We provide a full 1-Year Comprehensive Replacement Warranty. If any operational or mechanical fault occurs under normal operating conditions within 12 months, we will replace the unit or issue a full refund.
