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Key Technical Specifications
| Parameter | Specification |
| Manufacturer | B&R Industrial Automation |
| Model Code | 8MSA2S.R0-K4 |
| Motor Type | 3-Phase Permanent Magnet Synchronous Servo Motor |
| Flange Size (Size 2) | 55 mm Flange |
| Stator Length | Small (Length S) |
| Rated Speed | 6000 RPM nominal rating |
| Feedback System | Robust Resolver Feedback (R0) |
| Shaft Design | Shaft with key (K option) |
| 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 8MSA2S.R0-K4 is a compact, high-dynamic synchronous AC servo motor engineered to pair with B&R ACOPOS, ACOPOSmicro, and ACOPOSmulti drive platforms. Utilizing a ultra-compact Size 2 frame (55 mm flange) with a length S stator stack, this motor delivers high power density and rapid acceleration in space-constrained industrial machinery like lab automation, pick-and-place robotics, light packaging, and textile feeds.
Equipped with a robust analog resolver (“R0” designation), the 8MSA2S.R0-K4 handles continuous mechanical shock, intense machine vibration, and high ambient thermal stress where optical encoders fail. A servo motor failure on a precision feeder or high-speed indexer immediately halts production lines. Maintaining a factory-fresh, New Surplus 8MSA2S.R0-K4 unit in facility stock ensures zero magnet degradation, 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 55 mm pilot flange, keyed shaft, and circular electrical connectors for transit damage or contamination.
- Verify that the mating coupling, pulley, or gearbox bore matches the motor shaft keyway dimensions precisely.
2.Stage 2: Removal:Mechanical Extraction.
- Twist the bayonet locking rings counter-clockwise to disconnect power and resolver feedback cables.
- Loosen shaft set screws or clamp bolts on the driven load coupling.
- Remove the 4 flange mounting bolts and carefully slide the motor straight off the mounting pilot without applying axial force to the shaft.
3.Stage 3: Mechanical & Electrical Connection:Mounting & Coupling Setup.
- Align the 8MSA2S.R0-K4 pilot flange onto the machine mounting faceplate and insert shaft key into coupling keyway.
- Cross-torque mounting flange screws to specified torque ratings using a calibrated torque tool.
- Secure shaft coupling clamping bolts, ensuring zero axial loading or radial binding on the motor bearings.
- Connect circular power and resolver cables until connectors lock 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 8MSA2S.R0-K4 nameplate rating.
- Perform a low-speed manual jog test to confirm proper rotation direction, correct commutation angle, and smooth acceleration.
8MSA2S.R0-K4
8MSA2S.R0-K4
Firmware/Software Integration & Resolver Notes
- Automation Studio Compatibility: Supported across all releases of B&R Automation Studio via standard ACOPOS motor catalog hardware definitions.
- Resolver Feedback Reliability: The analog resolver feedback unit operates without optical glass scales or onboard microelectronics. Sinusoidal/cosinusoidal analog position signals provide extreme resistance 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 PWM inverter switching noise from coupling into analog resolver signals.
Frequently Asked Questions (FAQ)
Q: What do the “R0” and “K4” designators signify in the 8MSA2S.R0-K4 model code? A: “R0” indicates an analog resolver feedback device for high-vibration applications. “K4” specifies a shaft design equipped with a fitted key and keyway, without an internal mechanical holding brake.
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 compact servo motor? A: Compact Size 2 motors operate under dense thermal conditions; rebuilt units often suffer from degraded magnet field strength and altered stator insulation thickness. Our New Surplus inventory delivers 100% unused hardware with factory magnet flux, pristine bearings, and factory-aligned feedback devices.
Q: Is this 8MSA2S.R0-K4 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.
