PUR Tensile Servo Cable – High Flexibility, Double Shielded for Servo & Automation

Our PUR tensile servo cable delivers excellent heat resistance, flame retardance, and chemical resistance. The name “PUR” reflects its polyurethane‑grade performance in flexibility, abrasion, and oil resistance, while the outer jacket uses a specially compounded heat‑resistant PVC to ensure robust mechanical protection and VW‑1 compliance. High‑quality polyethylene (PE) insulation on the twisted pairs guarantees superior signal transmission. Coupled with an innovative double shield—aluminum foil Mylar plus tinned copper braid—the cable provides highly reliable protection against electromagnetic interference.

Engineered for continuous flexing, tensile stress, torsion resistance, and anti‑aging, this dedicated servo cable significantly improves the operational efficiency of servo motors, control motors, and actuators in automated systems.

Applications

Equipped with double tinned copper braid shielding, this cable is trusted for measurement, monitoring, and control tasks in:

• CNC machine tools
• Complete plant installations
• Power stations
• HVAC and refrigeration equipment
• Office automation and data processing systems

Cable Construction

Layer	Specification
Conductor	Stranded bare copper or tinned copper – excellent corrosion resistance
Insulation (cores)	Special heat‑resistant, flame‑retardant PVC or TPE
Twisted pair insulation	PE or TPE for optimal dielectric performance
Color code	Black cores with white numbers; twisted pairs: red & blue
Inner shield	Aluminum foil Mylar wrap + tinned copper braid
Drain wire (optional)	Same gauge as conductor – facilitates shield termination
Overall braid (optional)	Bare copper or tinned copper braid
Outer sheath	Compound 80 °C heat‑resistant, flame‑retardant PVC
Sheath color	Black (RAL 9005) or Orange (RAL 2003); custom colors available
Flame test	Passed VW‑1

Technical Specifications

Parameter	Value
Rated voltage (U₀/U)	600/1000 V
Test voltage	3500 V
Operating temperature (fixed)	−30 °C to +80 °C
Operating temperature (flexible)	−5 °C to +80 °C (consult datasheet)
Bending radius	Please refer to engineering datasheet

Key Features at a Glance

• Highly flexible and tensile‑relief design – stands up to constant motion, torsion, and pull forces in drag chains and robotic axes.
• PE‑insulated twisted pairs – low capacitance for clean signal transmission between servo drive and motor feedback devices.
• Double shielding (foil + braid) – effectively blocks electromagnetic interference (EMI) and meets stringent EMC requirements.
• Oil, abrasion, and aging resistant – long service life even in harsh industrial environments.
• VW‑1 flame‑retardant sheath – meets North American flame resistance standards.
• Ready for termination – optional drain wire and overall braid simplify grounding and shield connection.

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4. FAQ

Q1: What makes this servo cable “PUR” if the jacket is PVC? The label “PUR” indicates that the cable achieves polyurethane‑grade flexibility, abrasion resistance, and oil resistance. The proprietary PVC compound used for the jacket is blended to deliver comparable mechanical performance while also meeting stringent VW‑1 flame requirements.

Q2: Is this cable suitable for continuous flex and drag chain applications? Yes. The stranded copper conductor, short lay lengths, and specially formulated insulation and sheath give it high flex life and tensile relief, making it ideal for moving cable carriers, robot arms, and automated machinery.

Q3: How well does the cable shield against interference? It features a 100 % coverage aluminum foil Mylar inner shield plus a highly conductive tinned copper braid. This dual‑shield construction provides excellent EMI immunity, safe even in the presence of variable‑frequency drives and switching power lines.

Q4: What is the voltage rating, and can it be used for both power and signal? The rated voltage is 600/1000 V. The cable handles both servo motor power supply and encoder feedback signals in the same hybrid bundle thanks to the twisted pair shielding and high dielectric strength.

Q5: Is the jacket truly flame‑retardant? The outer PVC compound has passed the VW‑1 vertical flame test, a standard widely required in North American industrial and commercial installations.

Q6: What colors are available, and can I order a custom color? Standard stock colors are jet black (RAL 9005) and safety orange (RAL 2003). Custom sheath colors, as well as custom print legends, are available upon request – minimum order quantities apply.

Q7: Do you supply a drain wire or overall braid? Yes. An optional drain wire of the same conductor gauge and an additional tinned or bare copper braid can be included, which greatly simplifies shield grounding in panel and connector terminations.

Q8: How do I get a sample or a quotation? Simply reach out through our contact form or email our sales desk. We can ship free sample lengths for qualification and provide same‑day pricing on bulk orders.