Siemens 6FX3002-2CT12-1CA0 is a pre-assembled signal cable designed for an incremental encoder (TTL S-1) in Siemens motion applications. It belongs to the MOTION-CONNECT 300 connection system and is offered as a ready-to-install cable with defined electrical and mechanical properties so you don’t have to gamble on field assembly quality. Siemens describes it as a signal cable pre-assembled for incremental encoder TTL S-1 with conductor construction 3 × 2 × 0.20 + 2 × 2 × 0.25 and a 20 m length, with a straight connector version and a maximum diameter of 7.2 mm.
A practical way to think about this product: it is a reliability component. It does not “add features,” but it reduces the probability that your drive will see encoder errors, intermittent feedback, or commissioning delays caused by a questionable cable build.
Core Product Identification
| Item | Details |
|---|---|
| Manufacturer | Siemens |
| Order number (MLFB) | 6FX3002-2CT12-1CA0 |
| Product family | Pre-assembled signal cables for SINAMICS V90 |
| Cable system | MOTION-CONNECT 300 |
| Cable function | Encoder cable (incremental encoder / TTL S-1) |
| Typical use context | Connection system between SINAMICS V70/V90 servo converter and SIMOTICS TTL S-1/S-1FL6 servo motor (product description from distributor listing) |
| Lifecycle note | Siemens Industry Mall lists product phase-out (PM400) with phase-out effective since 01.10.2025 |
That lifecycle note matters for spare-parts planning: if you are standardizing on this cable for a fleet of machines, you should stock intelligently or confirm the successor part strategy through Siemens channels.
Technical Specifications (Electrical + Mechanical)
| Category | Specification |
|---|---|
| Cable type | Pre-assembled signal cable for incremental encoder |
| Encoder interface | TTL S-1 |
| Core construction | 3 × 2 × 0.20 + 2 × 2 × 0.25 |
| Length | 20.0 m |
| Maximum outer diameter | Dmax = 7.2 mm |
| Connector style | Straight connector (fixed cable outlet direction) / “version with straight connector” |
| Rated voltage (power conductors) | 30 V / 30 V (EN 50395) |
| Test voltage (rms, power conductors) | 500 V |
| Cable sheath material | PVC |
| Insulation type | PVC |
| Flame resistance standard | EN 60332-1-1 to 1-3 |
| Oil resistance | EN 60811-2-1 (mineral oil only) |
| Degree of protection | IP65 |
| Ambient temperature | −25 … +80 °C (operation with permanently installed cable) |
| Smallest bending radius (flexible installation) | 155 mm |
| Smallest bending radius (fixed installation) | 6 × diameter |
| Max number of bends | 1,000,000 |
| Torsional stress | Absolute 30°/m |
| UL marking note | Siemens listing states “No UL for connector on the motor side” |
Why Pre-Assembled Encoder Cables Make Machines Behave Better
Encoder signals are small, fast, and sensitive. TTL incremental feedback is especially intolerant of sloppy termination, wrong pairing, or inconsistent shielding. A pre-assembled Siemens cable helps in several concrete ways:
Stable geometry and pairing
The specified conductor construction is not cosmetic. Controlled core arrangement supports consistent impedance and predictable coupling, reducing the likelihood of “it works until the cabinet door is closed” style EMI surprises.
Repeatable connector quality
Field-assembled connectors fail in boring, expensive ways: poor crimp, tiny conductor nicks, wrong pin mapping, or insufficient strain relief. A factory-assembled cordset shifts that risk away from the commissioning phase and into a controlled manufacturing process. Siemens explicitly defines this item as “pre-assembled,” and distributors position it as a ready connection solution for SINAMICS motion setups.
Mechanical survivability where motion happens
Motion installations are not gentle. Cable carriers flex, cabinets vibrate, operators bump things, and maintenance techs pull on cables. The datasheet specifies up to 1,000,000 bends, a 155 mm minimum bending radius for flexible installation, and a torsional stress allowance of 30°/m, which are the numbers you care about when the cable runs through drag chains or tight routing paths.
Environmental resilience
The combination of IP65 and a −25 to +80 °C temperature range supports real industrial conditions (splashes, dust, temperature swings), while PVC sheath/insulation and referenced standards help with predictable behavior in typical machine environments.
Installation and Engineering Guidelines (Practical, Not Theoretical)
| Guideline | Why it matters |
|---|---|
| Respect bending radius (155 mm flex; 6×D fixed) | Exceeding bend limits is a classic way to create intermittent encoder faults months later. |
| Avoid high-noise parallel routing | Keep encoder cable away from motor power cables and switching devices where possible; crossing is better than long parallel runs. |
| Use proper strain relief at both ends | Connector strain relief prevents micro-movement at termination points that can mimic encoder dropout. |
| Keep shield termination consistent with the drive/motor guidance | A shield that is “kind of connected” is often worse than no shield; follow the SINAMICS documentation conventions. |
| Validate lifecycle strategy (phase-out noted) | If the part is in phase-out, plan inventory or identify the Siemens successor to avoid future downtime. |
One detail worth calling out: Siemens notes “No UL for connector on the motor side.” If your project has strict UL documentation requirements, treat that as an early engineering check rather than a last-minute compliance surprise.
Logistics and Catalog Data (Helpful for Purchasing)
| Item | Value |
|---|---|
| Net weight | 1.500 kg |
| Packaging dimensions | 500 × 500 × 80 mm |
| Country of origin | China |
| Commodity code | 85444290 |
| RoHS | RoHS conformity listed (Siemens) |
Summary
Siemens 6FX3002-2CT12-1CA0 is a MOTION-CONNECT 300 pre-assembled incremental encoder (TTL S-1) signal cable, built to connect motion components in SINAMICS-oriented systems with predictable electrical performance and industrial mechanical robustness. It is specified as a 20 m cable with defined conductor construction, IP65 protection.
