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Key Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | A06B-0590-B004#7000 / A06B-0590-B004#7008 |
| Motor Series | FANUC AC Servo Motor α-Series, Model 30S/1200 |
| Continuous Stall Torque (Tc) | 2.35 Nm (at low speed, 20°C) |
| Rated Output | 0.54 kW (≈ 0.72 HP) |
| Maximum Speed | 3000 min⁻¹ (RPM) |
| Base Speed | 1200 min⁻¹ (for 30S/1200 variant) |
| Encoder Type | Incremental optical encoder (Pulsecoder) |
| Encoder Resolution | 2000 pulses/rev (2000P) |
| Rated Current (Ic) | 9.0 A (rms, at low speed) |
| Maximum Current (Imax) | 54 A (peak) |
| Torque Constant (Kt) | 0.224 Nm/A (rms) |
| Back EMF Constant (Ke) | 23.5 V / 1000 min⁻¹ (approx.) |
| Rotor Inertia | 0.00229 kg·m² |
| Insulation Class | Class F (155°C) |
| Protection Rating | IP44 (standard for α-Series) |
| Cooling | Self-ventilated (fan-cooled on some variants) |
| Shaft Type | Straight shaft with key (#7000: straight/slick; #7008: keyed) |
| Brake Option | Available on some suffixes (not standard on base B004) |
| Flange Size | 130 mm (typical for 30S class) |
| Weight | ~4.3 kg (without brake; varies by suffix) |
| Voltage Class | 200 V AC servo amplifier compatible |
Product Introduction
The FANUC A06B-0590-B004 (A06B-0590-B004#7000 / #7008) is an AC servo motor from the α-Series, designated Model 30S/1200. It delivers 2.35 Nm continuous torque at up to 3000 RPM and uses a 2000-pulse incremental encoder for precise position feedback in CNC axis drives and automation systems.
This motor is chosen for its compact 130 mm flange, proven reliability in legacy FANUC CNC machines, and direct compatibility with 200 V-class α-Series servo amplifiers. The #7000 and #7008 suffixes denote shaft and encoder configurations (straight vs. keyed shaft, 2000P incremental encoder), making them drop-in replacements for worn or failed 30S/1200 units.
A06B-0590-B004#7000
A06B-0590-B004#7000
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| Motor won’t rotate, no alarm | Servo amplifier fault or enable signal missing | ❌ Low | Check amplifier status LEDs and CNC alarm screen; verify servo ON signal | Issue is likely at amplifier or CNC, not the motor itself |
| Excessive vibration or noise | Encoder fault, mechanical coupling issue, or bearing wear | ⚠️ Medium | Monitor encoder feedback on servo diagnostics; check coupling alignment and backlash | Replace motor if encoder errors persist; inspect mechanical drive train |
| Overheat alarm on axis | Overload, poor cooling, or high ambient temperature | ⚠️ Medium | Check duty cycle and load torque vs. motor rating; inspect cooling fins and airflow | Reduce load or improve ventilation; verify motor is not undersized for application |
| Position error or following error alarm | Encoder signal loss, cable damage, or tuning issue | ✅ High | Check encoder cable continuity and shielding; review servo tuning parameters | Replace motor or encoder cable if feedback is intermittent; re-tune if needed |
| Burning smell or smoke from motor | Winding insulation failure or short circuit | ✅ High | Visual inspection for discoloration; megger test windings to ground | Replace motor immediately; do not re-energize |
| Motor fails after swap | Wrong encoder type or shaft configuration mismatch | ✅ High | Compare old motor label (suffix #7000 vs #7008, encoder resolution) before removal | Match exact part number and encoder specs on replacement |
If you’re stuck, send photos of the motor nameplate, encoder cable connector, and any CNC/servo alarm screens. We’ll review them before you commit to a swap.
Frequently Asked Questions (FAQ)
Q: What’s the difference between A06B-0590-B004#7000 and #7008?
A: Both are Model 30S/1200 α-Series servo motors with 2.35 Nm torque and 2000P incremental encoders. The suffix indicates shaft and encoder details: #7000 typically denotes a straight/slick shaft, while #7008 indicates a keyed shaft. Electrically, they are equivalent for most CNC axis applications.
Q: Is this motor compatible with β-Series or αi-Series amplifiers?
A: No. The A06B-0590- is an α-Series motor designed for α-Series servo amplifiers (e.g., αSV 20/40/80). It is not directly compatible with β-Series or newer αi-Series drives without significant reconfiguration and parameter changes. Always match motor series to amplifier series.
Q: Can I use this motor on a 400 V servo system?
A: No. This is a 200 V-class motor. Using it on a 400 V amplifier will damage the windings and encoder. Verify your amplifier voltage class before ordering.
Q: Will my CNC parameters and servo tuning survive a motor swap?
A: Yes. The motor parameters (torque constant, inertia, encoder type) are stored in the CNC/servo parameter set. As long as you replace it with the same model (30S/1200, 2000P encoder), the existing parameters remain valid. Always back up your servo parameters before hardware changes.
Q: Why is this cheaper than buying direct from FANUC?
A: This is new surplus or inspected stock from decommissioned systems and authorized distributors. It’s genuine FANUC hardware, function-tested, but sold as surplus rather than factory-direct new. That’s why the price is lower while still carrying a 1-year replacement warranty.
Q: What condition is the unit in—new, used, or refurbished?
A: We list each unit explicitly: “New Original / New Surplus” means factory-sealed or unused surplus with original packaging; “Refurbished (tested)” means cleaned, electrically tested, and verified functional on a FANUC α-Series servo test rig. The product page or quote will state which applies.
Q: Do you provide test reports or run-up videos?
A: Yes. For refurbished units, we can supply a basic functional test report (insulation resistance, no-load run-up, encoder feedback verification) and short run-up video on request. Just ask before purchase.
