RESOLVER R11W-F10/7-2 Rotary Transformer

RESOLVER R11W-F10/7-2 — Stop the Clock on Your Downtime. Ship Today.

Every hour your servo axis sits dead costs real money. A failed resolver is one of the most misdiagnosed faults on the floor — the drive throws an encoder error, the maintenance team chases wiring, and three shifts later someone finally pulls the feedback unit and reads the nameplate. If that nameplate says R11W-F10/7-2, you are in the right place. We stock this unit in Xiamen, it clears customs fast, and DHL puts it on your dock in 2–5 business days to most destinations worldwide.

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Quick Technical Datasheet

Troubleshooting & Replacement Tips

Fault Codes That Point to This Unit

Before you condemn the resolver, rule out the cable. Resolver faults are almost always reported as drive-side errors — the resolver itself rarely fails catastrophically without a mechanical event. Common drive alarm codes that trace back to the R11W-F10/7-2:

• Encoder/Resolver Signal Loss — Drive loses sine/cosine amplitude below threshold. Check excitation voltage at the resolver connector first (typically 7–10 Vrms at 5–10 kHz). If excitation is present and output is absent, the rotor winding is open.
• Position Deviation Overflow — Intermittent signal dropout causing the R/D converter to lose track. Usually caused by a cracked rotor winding or a loose connector pin under vibration. Wiggle the cable at the resolver body while monitoring the drive’s feedback signal — if the alarm clears and returns, it is the cable or connector, not the resolver.
• Resolver Transformation Ratio Error — Drive detects incorrect signal amplitude ratio. This means the stator windings have degraded resistance (moisture ingress, thermal damage). Measure stator winding resistance with a milliohm meter and compare against the datasheet reference values.
• Absolute Position Mismatch After Power Cycle — If the drive uses a two-speed resolver configuration and the coarse/fine channel ratio is wrong, the absolute position calculation fails. Verify the drive parameter for resolver pole pairs matches the R11W-F10/7-2 specification.

Step-by-Step Replacement Procedure

1. De-energize and lock out the drive. Confirm DC bus voltage has discharged below 50 V before touching any wiring. Resolver cables carry low voltage but the servo axis can move unexpectedly if the drive is not inhibited.
2. Document the existing cable routing and connector pinout. Photograph the resolver connector and cable dress before disconnecting. The R11W-F10/7-2 uses a standard RESOLVER pinout, but field modifications are common on older machines.
3. Mark the shaft coupling position. Use a paint marker or scribe to mark the angular relationship between the resolver shaft and the motor shaft before uncoupling. This is your reference for the mechanical zero offset.
4. Remove the resolver. Loosen the flange mounting screws (typically M4 or M5). Do not apply axial force to the shaft — support the resolver body while withdrawing it from the coupling.
5. Install the R11W-F10/7-2. Align the shaft coupling to your pre-marked position. Torque the flange screws to the manufacturer specification. Do not over-torque — the resolver housing is aluminum and threads strip easily.
6. Reconnect the cable. Verify pin-for-pin continuity against your photograph. Secure the cable with the original strain relief — resolver cables fail at the connector entry point when left unsupported.
7. Perform the drive’s resolver offset calibration. Most servo drives (Siemens, Fanuc, Yaskawa, Mitsubishi) require a resolver offset auto-tune after replacement. Refer to your drive’s commissioning manual for the specific parameter and procedure. Skipping this step will result in torque ripple, hunting, or a position error fault at startup.
8. Verify signal quality. Use the drive’s diagnostic screen to confirm sine/cosine amplitude is within ±5% of the nominal value and that the Lissajous figure is circular (not elliptical). An elliptical pattern indicates a winding resistance imbalance.

Configuration Notes

• No DIP switches or address settings on this unit — it is a passive electromagnetic device with no electronics.
• Firmware matching is not required on the resolver side, but confirm your drive’s R/D converter is configured for the correct transformation ratio (F10/7-2 encodes the turns ratio).
• If replacing a unit that was previously trimmed for offset, the new unit will require a fresh offset calibration — do not copy the old offset parameter value.

Reliability in Harsh Conditions

The R11W-F10/7-2 is built for environments that destroy optical encoders in months. The brushless rotary transformer design has no optical disc, no glass scale, no LED, and no photodetector — there is nothing to contaminate, crack, or burn out. The rotor and stator are wound with Class F magnet wire rated to 155 °C continuous, potted against moisture and vibration, and enclosed in a machined aluminum housing that dissipates heat without trapping it.

In foundry and forge environments where ambient temperatures exceed 80 °C and coolant mist is constant, this resolver continues to deliver clean sine/cosine signals where an optical encoder would have failed within the first quarter. On press lines and stamping machines where shock loads reach 50 g and vibration is broadband, the solid magnetic construction absorbs what would shatter a glass encoder disc. In coastal and offshore installations where salt-laden air attacks every exposed surface, the IP54 sealing keeps the winding cavity dry through years of continuous operation.

This is not marketing language — it is the engineering reason why resolvers remain the feedback device of choice in steel mills, shipyards, and heavy press lines decades after optical encoders became cheaper. When the environment is hostile enough to matter, the R11W-F10/7-2 is the component that keeps running.

Global Express Logistics

Our warehouse is located in Xiamen, Fujian Province — one of China’s primary export hubs with direct access to DHL, FedEx, and UPS international gateways. Orders confirmed before 15:00 CST ship same day. Here is what the logistics chain looks like from your purchase order to your receiving dock:

• Day 0 (Order Confirmation): Stock verified, unit pulled and inspected, export documentation prepared (commercial invoice, packing list, certificate of origin).
• Day 1 (Dispatch): Shipment handed to DHL Express or FedEx International Priority. Tracking number issued within 2 hours of pickup scan.
• Day 2–3 (Customs Clearance): Xiamen customs clearance is typically completed within 24 hours. HS code 8543.70 is pre-declared. For destinations requiring import permits, we advise in advance.
• Day 3–5 (Delivery): DHL Express delivers to most of Europe, North America, Southeast Asia, and the Middle East within this window. Remote destinations may require 1–2 additional days.

For critical shutdowns where every hour counts, we also offer same-day courier handoff to the Xiamen airport cargo terminal for the earliest available flight. Contact us directly on WhatsApp for this option — it is not available through the standard checkout flow.

All shipments include full export documentation. We do not ship gray-market or re-labeled stock. Every unit leaves with a packing list that matches the commercial invoice, and COC (Certificate of Conformance) is available on request for incoming QC requirements.

Contact Information

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