Description
The Kollmorgen PMA240-1050B-02 is a discontinued medium-frame permanent-magnet brushless servo motor originally manufactured under Pacific Scientific branding, engineered for high-speed precision positioning on CNC machinery, automated packaging, and robotic axes.
| Parameter | Value |
|---|---|
| Full Part Number | PMA240-1050B-02 |
| OEM Origin | Pacific Scientific (acquired by Kollmorgen) |
| Rated Continuous Power | 1.2 kW |
| Max No-Load Speed | 8,300 RPM |
| Continuous Stall Current | 3.4 A AC |
| Peak Stall Current | 24.4 A AC |
| DC Bus Operating Range | 560–640 V DC |
| Encoder Configuration | 1X-RX single-turn resolver feedback |
| Mechanical Enclosure Rating | IP65 (shaft and connector housing) |
| Insulation Class | Class 180 (N) |
| Shaft Feature | Standard keyed output shaft |
| Unit Weight | 4.0 kg |
| Construction Origin | Assembled in USA |
| Certifications | CE, cULus; verify with OEM datasheet |
| Status | Manufacturer Discontinued (end-of-production) |
Functional Description
This PMA-series motor relies on a sinusoidal brushless PM rotor design with low rotor inertia to deliver fast acceleration/deceleration cycles for high-throughput automation. The integrated resolver provides analog position feedback compatible with Pacific Scientific SC900 and SCE900 analog servo drives; digital encoder retrofits are not factory-supported for this model.
Dual circular bayonet connectors separate power wiring and resolver signal wiring to eliminate crosstalk in high-electrical-noise machine enclosures. Internal thermal cutout switches trigger drive fault alerts when winding temperature exceeds 155 °C, preventing permanent magnet demagnetization under sustained overloads.
The IP65 housing blocks coolant, cutting fluid, and airborne machining dust in machine tool environments; shaft seals require periodic lubrication during scheduled maintenance cycles.
Compatibility Matrix
- Valid Servo Drives: Pacific Scientific SC900, SCE900 analog servo amplifiers; incompatible with Kollmorgen AKD digital drives without custom signal conversion hardware
- Feedback Restriction: Only resolver-based control systems supported; native digital encoder (EnDat, Hiperface) functionality not available
- Supply Voltage Constraint: Requires 560–640 V DC bus; cannot operate on 230 V single-phase low-voltage drive platforms
- Mechanical Mounting: Standard metric IEC servo flange; direct replacement only for matching PMA-series frame-size motors
- Backward Compatibility: No cross-compatibility with older Pacific Scientific R-series brushed servo motors
Condition, Stock & Lead Time
- Available Unit Conditions: New Surplus (factory sealed unused OEM stock), Certified Refurbished (full load cycle testing), Used Pull (limited 6-month coverage)
- Typical In-Stock Volume: 5–22 new surplus units across global automation spare parts vendors
- Bench Test Scope (Refurbished Units): Winding insulation resistance test, resolver signal calibration, full-speed 1-hour load run, thermal fault trip simulation, connector continuity check
- Domestic Lead Time (North America): 2–4 business days via ground freight; expedited air shipping 1–2 business days
- International Lead Time: 7–14 business days via DHL/FedEx express
- Standard Warranty: 12-month replacement warranty for new surplus stock; 9-month warranty for certified refurbished units
Pricing Guidance
Global reseller indicative pricing ranges 9,800–11,300 USD per unit, with volume discounts for orders of 3+ motors.Price subject to surplus inventory availability and regional import tariffs; contact supplier for a firm quote including test documentation and shipping costs.
Industrial Application Notes
- Continuous-duty operation above 7,000 RPM requires forced air cabinet cooling to limit winding temperature rise; sustained ambient temperatures above 40 °C reduce allowable continuous torque output by 18%.
- Resolver cable runs longer than 15 meters require shielded twisted-pair wiring; unshielded cables produce position drift and velocity oscillation during high-speed moves.
- The motor does not include an integrated holding brake; add a third-party shaft brake for vertical Z-axis machine applications to prevent freefall during power loss.
- Discontinued OEM spare parts (resolvers, shaft seals, terminal pins) have extended lead times of 12–16 weeks; maintain a spare PMA240-1050B-02 unit for critical production lines.
- Do not mix this high-voltage 560–640 V motor with 240 V bus PMA-series variants; voltage mismatch causes immediate winding burnout on power-up.
Frequently Asked Questions
Q: Can this motor be controlled by modern Kollmorgen AKD digital drives?A: Native direct connection is not supported. A separate resolver-to-digital signal converter module is required, which adds measurable position loop latency to motion cycles.
Q: What is the expected service life of the internal resolver?A: Field data shows 35,000 operating hours before signal degradation; replace resolver during major machine overhauls at 30,000 hours to avoid unplanned downtime.
Q: Does this unit support regenerative braking?A: Yes, regenerative energy flows back to the drive DC bus; install external braking resistors for rapid deceleration of high-inertia loads to prevent overvoltage faults.
Q: Are factory original service manuals still available from Kollmorgen?A: Official OEM datasheets and service guides are archived digital-only; physical printed manuals are no longer produced. Request PDF documentation from your spare parts supplier before purchase.
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