AUTOTECH SAC-RL100-M11 Resolver – Obsolete RL100 Series Spare Part

Technical Dossier

Product Details And Specifications

AUTOTECH SAC-RL100-M11 Resolver – Obsolete RL100 Series Spare Part

When an AUTOTECH SAC-RL100-M11 resolver fails on a production line, the consequences extend far beyond a single sensor. This component is the position feedback backbone of legacy servo drive systems built around AUTOTECH's RL100 series — systems that, in many facilities, have been running reliably for 15 to 25 years. Replacing the entire servo axis, the drive cabinet, and the associated motion controller to accommodate a modern resolver interface can cost $80,000 to $400,000 per axis, not counting engineering hours, line downtime, and revalidation. A single SAC-RL100-M11 unit, sourced from verified stock, eliminates that exposure entirely.

DriveKNMS maintains a limited inventory of this discontinued component. Once current stock is depleted, no further supply can be guaranteed.

Technical Specifications

Note: Electrical parameters such as excitation voltage, transformation ratio, and impedance values are not published here to avoid inaccuracy. Confirmed specifications are available upon request with your system documentation.

Solving the Discontinued Hardware Crisis

The SAC-RL100-M11 is a resolver — not an encoder. Resolvers are inherently more robust in harsh industrial environments: they are immune to vibration-induced count loss, tolerate wide temperature swings, and carry no internal electronics that degrade over time. This is precisely why AUTOTECH's RL100-series resolvers were specified into high-cycle servo applications in the first place, and why so many of these systems remain in service decades after the product line was discontinued.

The problem facing maintenance engineers today is not the resolver's reliability — it is availability. AUTOTECH no longer manufactures the SAC-RL100-M11. Authorized distributors have exhausted their buffer stock. The secondary market supply is finite and shrinking. When a unit fails, the facility faces a binary choice: source a verified replacement immediately, or begin an unplanned capital project to retrofit the axis with a modern feedback device — a project that requires new drive firmware, new cabling, mechanical adapter machining, and full motion re-tuning.

For plant managers operating under capital expenditure constraints, the calculus is straightforward. A verified SAC-RL100-M11 spare extends the productive life of the existing asset by 5 to 10 years at a fraction of the retrofit cost. Holding two to three units in bonded stores eliminates the single-point-of-failure risk entirely.

Condition & Reliability Assurance

Every SAC-RL100-M11 unit processed by DriveKNMS passes a structured 5-step inspection protocol before it is offered for sale:

• Step 1 – Visual and mechanical inspection: Housing integrity, shaft runout check, connector pin condition, and corrosion assessment on all mating surfaces.
• Step 2 – Winding resistance verification: Primary and secondary winding resistance measured and compared against known-good reference values to detect open circuits or inter-winding shorts.
• Step 3 – Insulation resistance test: Megohm-level insulation check between windings and between windings and housing to confirm dielectric integrity.
• Step 4 – Connector and pin corrosion audit: M11 connector pins inspected under magnification. Oxidized contacts are cleaned or flagged for replacement before dispatch.
• Step 5 – Firmware and compatibility cross-reference: Unit part number and date code verified against known production batches to confirm compatibility with target drive systems.

Units that do not pass all five steps are not offered for sale. Condition grade (New Old Stock, Tested Surplus, or Refurbished) is disclosed in writing with each order.

Key Features for System Maintenance

• Drop-in replacement: The SAC-RL100-M11 installs directly into the existing servo motor housing without mechanical modification, preserving the original mounting interface and cable routing.
• No drive reprogramming required: Because the resolver output signal is electrically identical to the original, the servo drive's resolver-to-digital (R/D) converter requires no parameter changes. Commissioning time is measured in minutes, not days.
• No engineering retrofit costs: Avoiding a feedback device change eliminates the need for drive firmware updates, new cable assemblies, and motion re-tuning — costs that routinely exceed $15,000 per axis in engineering labor alone.
• Preserves validated process parameters: In regulated manufacturing environments (pharmaceutical, food processing, aerospace), replacing a like-for-like component avoids triggering a full process revalidation, which can take weeks and cost more than the capital equipment itself.

Extending Automation Asset Life: A Maintenance Strategy for Plant Management

The economic case for maintaining legacy servo systems rather than replacing them is well established in facilities where the process is stable and the capital budget is constrained. The SAC-RL100-M11 resolver is a consumable within a larger, expensive asset. The servo motor, the drive, the mechanical transmission, and the process tooling represent the real capital investment. Protecting that investment through proactive spare parts management is not a compromise — it is sound asset stewardship.

A structured approach to extending system life by 5 to 10 years typically involves three actions: identifying all single-point-of-failure components on critical axes, securing a minimum two-unit buffer stock of each, and documenting the installation and commissioning procedure so that replacement can be executed by maintenance staff without specialist support. For the SAC-RL100-M11, DriveKNMS can supply the parts and provide the technical cross-reference documentation to support this process.

Facilities that have adopted this approach report that the total cost of a planned spare parts program — including procurement, storage, and periodic condition checks — is consistently less than 8% of the cost of a single unplanned axis retrofit. The risk-adjusted return on holding verified resolver spares is not a marginal improvement. It is a structural reduction in operational exposure.

FAQ

What warranty applies to a discontinued part like the SAC-RL100-M11?
DriveKNMS provides a 90-day functional warranty on all tested surplus and refurbished units, and a 180-day warranty on confirmed New Old Stock units. Warranty terms are confirmed in writing at the time of order.

How do I know the unit is genuine and not a counterfeit?
All units are inspected against known AUTOTECH production markings, date codes, and winding characteristics. We do not source from unverified brokers. Provenance documentation is available for units where chain-of-custody records exist.

Should I buy more than one unit?
For any axis running in a production-critical application, holding a minimum of two SAC-RL100-M11 units in stores is the standard recommendation. Given the declining availability of this part, procurement decisions made today carry significantly lower cost and risk than those made after a failure event.

Can you source this part if I need it urgently?
Contact us immediately. We maintain active sourcing channels for obsolete AUTOTECH components. Response time for urgent inquiries is within 4 business hours.