SAB VFD XLPE Auto TR Continuous-Flex Cable Review: Specs, Price and Applications
Updated: 4 days ago
VFD XLPE Auto TR is SAB’s continuous-flex, shielded motor-supply cable in Series 3578. Its Class M tinned-copper conductors distinguish it from the Class K standard TR construction. SAB recommends Auto TR for cable tracks, while publishing a 12-times-outside-diameter minimum bending radius. Motion suitability must still be checked against the actual carrier and duty.
Quick Verdict
Consider Auto TR when repeated cable-carrier movement is a real requirement of the motor route. Its value is a documented continuous-flex construction rather than a smaller bend envelope by default. The published information does not establish a universal cycle life, torsional robot-joint rating or approval for every carrier arrangement.
SAB VFD XLPE Auto TR Continuous-Flex Cable at a Glance
Specification | Details |
Product role | Continuous-flex shielded VFD/servo motor supply cable |
Conductor construction | Class M tinned-copper strands |
Track suitability | Manufacturer recommends application in track |
Example 35781404 | 14 AWG, four conductors including ground; published OD 14.5 mm ±10% |
Approval-specific voltage | 600 V UL/cUL; 1000 V WTTC and CSA AWM; use applicable cable marking |
Temperature scope | UL/cUL/CSA up to 90°C; separate static range −40 to +105°C |
Published bending radius | Minimum 12 × cable outside diameter; exact installation and duty apply |
Shield construction | Overall foil plus tinned-copper braid |
Procurement | Request a quote for exact part number, conductor sizes, length and terminations |
Design and Engineering Assessment
Auto TR should be selected by the cable’s motion duty, not by visual similarity to standard TR. The different stranding and manufacturer track recommendation matter even when both products have XLPE insulation and overall foil/braid shielding. Substituting ordinary TR because it fits the same route would discard the stated movement distinction.
The published 12×OD radius makes packaging a sizing task. For the 14.5 mm nominal example, simple multiplication gives 174 mm. That calculation is a nominal planning illustration, not a universal approved carrier radius: the diameter tolerance, exact product and supplier’s duty requirements still apply.
Repeated bending and torsion are separate mechanical demands. A cable qualified for a guided carrier route cannot be assumed to tolerate unrestricted twisting through robot joints. Establish how the cable moves over the full machine stroke, including any rotation near its ends.
Define the Motion Before Selecting the Carrier
Record travel, speed, acceleration, cycle pattern and the full moving cable length. Describe whether the route bends in a controlled plane or also twists. The supplier needs that duty to assess an appropriate cable and installation.
Include the motor-end service loop and transitions outside the carrier. A controlled bend inside the carrier does not protect an unsupported exit where repeated movement is concentrated. Plan strain relief and mechanical support around the actual movement envelope.
Bend Radius and Cross-Section Fit
Obtain the outside diameter for the exact ordered gauge and construction. Check the carrier, end fittings and route against the required radius, diameter tolerance and available envelope. Increasing conductor size can change the mechanical design as well as the electrical capacity.
Class M construction does not authorize a tighter radius than the published requirement. Likewise, the carrier’s own permitted bend radius is not proof that the selected cable can operate at that radius. The complete combination must be appropriate for the motion duty.
Electrical Selection and Shield Continuity
Size the power conductors and protective conductor for the actual installation. Confirm the drive’s permitted motor lead, switching conditions and output-filter requirements. Cable flexibility does not resolve motor insulation, reflected-wave or leakage-current limits.
Use compatible connectors and glands, with a shield arrangement specified for the drive installation. Repeated motion should not be carried by electrical terminations. Confirm that the chosen termination accepts the fine-stranded construction and that movement is restrained where the assembly enters the motor or enclosure.
Temperature and Environmental Scope
Preserve the documented distinction between approval-specific voltage and temperature values. The separate −40 to +105°C static range does not automatically describe continuously moving operation throughout that interval. Obtain the relevant motion-temperature limits for the intended application.
Oil, sunlight and direct-burial statements identify particular material or installation characteristics. They do not establish universal resistance to every chemical, cleaning process or abrasion condition. Match the route to the actual environment and inspect transition points where local wear can dominate.
Commissioning, Inspection and Value
Observe the carrier over the full stroke before releasing the machine. Check routing, bend behavior, end restraint and interference with neighboring lines. Confirm motor operation and inspect the cable where the route changes support or direction.
Define an inspection and replacement approach appropriate to duty and failure consequences. No universal cycle-life number is asserted here. Compare complete cable assemblies at the same travel, bend envelope, electrical load and environmental conditions rather than comparing bare-cable price alone.
Applications and Selection
Supplying selected drive-controlled motors through a properly designed moving cable carrier in industrial machinery.
For SAB VFD XLPE Auto TR Continuous-Flex Cable, define the actual machine duty before selecting an ordering configuration. Include the required operating point, available installation space, environment and control interfaces. The specification table describes the product or family; the surrounding machine determines which of those features matters for the intended job.
Price and Value
Request a quote for the selected conductor size, length and moving assembly. Include connectors, glands, carrier compatibility, strain relief and the required documentation for the actual motion duty.
Compare Auto TR with another cable qualified for the same travel and bend conditions. A lower-priced flexible installation cable is not an equivalent when its manufacturer does not recommend carrier service.
Pros and Cons
Advantages
Manufacturer explicitly identifies continuous-flex and carrier suitability
Class M construction addresses a different duty from standard TR
Published bend and configuration data help mechanical integration
Limitations
Continuous flex is not a universal torsion rating
No universal cycle-life guarantee is established by the family data
Actual bend envelope and motion-temperature scope need configuration-level confirmation
Who Should Consider SAB VFD XLPE Auto TR Continuous-Flex Cable?
Machine builders who need a VFD motor cable for repeated carrier travel and can define the complete bend, motion, electrical and environmental duty before selecting a part.
SAB VFD XLPE Auto TR Continuous-Flex Cable FAQ
What is the key difference from standard VFD XLPE TR?
Auto TR uses Class M conductors and is recommended for track service. Standard TR uses Class K conductors and is not recommended in track.
Can every Auto TR be installed at a tiny bend radius?
No. SAB publishes a minimum radius of 12 times outside diameter. Confirm the exact part, tolerance and duty requirements.
Does continuous flex establish robot-joint torsion capability?
No. Guided bending and torsion are different demands. Obtain explicit approval for any twisting duty.
Is there a universal published cycle life here?
No universal life figure is asserted. Specify travel, speed, acceleration, radius and environment for the supplier’s assessment.
Does the static temperature range define all moving operation?
No. Obtain the applicable motion-temperature limits rather than transferring the static range to continuous travel.
Does the four-conductor count exclude ground?
The cited Series 3578 configurations count the ground within the four conductors. Confirm the exact ordering and termination diagram.
Can cable selection replace drive lead-length checks?
No. Confirm the selected drive and motor requirements, including any output-filter and installed lead-length limits.
What should the quotation include?
State part number, gauge, length, carrier, travel, speed, acceleration, bend envelope, temperature, environment, connections and acceptance requirements.
Prices are indicative and may change. Confirm the final configuration, commercial terms and delivery schedule before ordering.
