Yaskawa SGMRV-05ANA-YR21 AC Servo Motor

Yaskawa SGMRV-05ANA-YR21 — Stop the Clock on Your Downtime. Ship Today.

Every hour a rotary axis sits dead, your production schedule bleeds money. The Yaskawa SGMRV-05ANA-YR21 is a 400W hollow-shaft direct-drive AC servo motor — the exact unit that keeps your indexing table, robotic joint, or precision assembly axis running at spec. We stock it in Xiamen. We ship it today. No 8-week OEM lead time. No compromise on authenticity.

Whether you’re staring at an A.810 encoder fault, a seized hollow shaft, or a burnt winding from a power surge, this is the part that gets your line back. Verified original Yaskawa. Tested before dispatch. Packed for air freight.

URGENT REQUIREMENT? Contact: [email protected] | WhatsApp: +86 18359268345

Quick Technical Datasheet

Troubleshooting & Replacement Tips

Most common failure modes on the SGMRV-05ANA-YR21:

1. Encoder Battery Alarm (A.810 / A.811)
The 17-bit absolute encoder relies on a backup battery to retain multi-turn position data. When the battery voltage drops below threshold, the drive throws A.810 (encoder backup alarm) or A.811 (encoder checksum error). Before condemning the motor, replace the encoder battery first — it’s a 3.6V lithium cell accessible from the rear cover. If the alarm persists after battery swap and encoder reset via SigmaWin+, the encoder itself has failed and the motor must be replaced.

2. Winding Insulation Breakdown
In environments with coolant mist or humidity cycling, winding insulation degrades over 3–5 years. Symptom: drive trips on overcurrent (A.300) or ground fault (A.400) immediately on enable. Megger test between any phase and motor frame — anything below 1 MΩ at 500V DC confirms winding failure. No field repair is possible; replace the motor.

3. Hollow Shaft Bearing Wear
Direct-drive motors carry full load torque through the bearing set — there is no gearbox to absorb shock. Symptom: audible rumble at low speed, vibration spike on the drive’s monitor function, or gradual TCP drift on a robotic joint. Check radial play at the shaft bore. If play exceeds 0.02 mm, bearing replacement or full motor swap is required.

Replacement procedure — critical checkpoints:

• Option suffix must match exactly. -YR21 encodes a specific connector pinout and shaft seal. Substituting -YR11 or -YR31 will cause connector mismatch or IP rating failure. Do not assume suffixes are interchangeable.
• Absolute encoder initialization. After fitting the new motor, you must perform an absolute encoder setup (Fn008 in SigmaWin+) before the drive will accept position commands. Skipping this step causes A.C90 (encoder not initialized) and the axis will not move.
• Drive parameter Pn170 — motor selection. If your drive was previously tuned to a different motor, verify Pn170 is set to the correct SGMRV motor code. A mismatch causes torque ripple and instability at low speed — a common post-swap complaint that wastes hours of debugging.
• Hollow shaft cable routing. The through-bore is typically used for signal cables or pneumatic lines. Before pulling the motor, photograph and label every cable routed through the bore. Re-routing errors after installation are a leading cause of post-repair faults.
• Σ-7 drive compatibility. The SGMRV series was designed for Σ-V (SGDV) drives. If your site has upgraded to Σ-7 (SGD7S), check Yaskawa’s compatibility matrix — some SGMRV models require a firmware update on the drive before the motor is recognized. Confirm before ordering.
• Torque constant verification. After replacement, run a JOG cycle at 10% speed and monitor current. If current is 20%+ higher than the previous motor at the same load, recheck Pn170 and motor wiring phase order (U/V/W).

Reliability in Harsh Conditions

The SGMRV-05ANA-YR21 is not a lab instrument — it was designed to survive the floor. The IP67 rating means the motor body is fully sealed against dust ingress and can withstand temporary immersion, making it suitable for CNC machining centers where coolant mist is constant. The hollow-shaft design eliminates the gearbox — the single most common mechanical failure point in servo systems — reducing the number of wear components and extending mean time between failures.

Yaskawa’s SGMRV series undergoes vibration testing per IEC 60068-2-6 (sinusoidal, 10–500 Hz) and shock testing per IEC 60068-2-27 before leaving the factory. The winding insulation class (Class F, 155°C) provides margin above the rated operating temperature, protecting against thermal runaway in poorly ventilated enclosures. The 17-bit absolute encoder is potted and shielded against EMI — critical in welding cells and high-frequency drive environments where encoder noise is a persistent source of nuisance faults.

Units shipped from our Xiamen warehouse are stored in climate-controlled conditions and inspected for packaging integrity before dispatch. Every motor ships in original Yaskawa anti-static foam packaging with desiccant to prevent moisture ingress during air freight transit.

Global Express Logistics

Our Xiamen warehouse is 40 minutes from Xiamen Gaoqi International Airport (XMN), one of China’s primary air cargo hubs with daily freighter connections to Frankfurt, Dubai, Chicago, and Singapore. This geography is not accidental — it was chosen specifically to minimize the gap between order confirmation and wheels-up.

Standard dispatch timeline:

• Order confirmed before 14:00 CST: Same-day dispatch via DHL Express or FedEx International Priority
• Order confirmed after 14:00 CST: Next business day dispatch
• Transit times: Southeast Asia 1–2 days | Europe 3–4 days | North America 3–5 days | Middle East 2–3 days | Australia 3–4 days

All shipments include a commercial invoice, packing list, and certificate of origin. For customers requiring customs clearance support, we provide HS code documentation (HS 8501.52 — AC motors, multi-phase, 750W or less) and can prepare a formal proforma invoice for import duty pre-calculation. DHL and FedEx account numbers are available for customers who prefer to ship on their own account — contact us to arrange.

For critical emergency shipments, we offer a door-to-door tracking service with proactive milestone updates: dispatch confirmation, departure scan, customs clearance, and final delivery — so your maintenance team knows exactly when the part lands.

Contact Information

📧 Email: [email protected]
💬 WhatsApp: +86 18359268345
🌐 Web: siemensplc.com
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