PUR Flexible Screened Servo Motor Power Cable
This PUR screened servo motor power cable is designed for the direct power connection from servo drive to servo motor — carrying the PWM-modulated output voltage of the drive inverter to the motor terminals. The cable must withstand the high dV/dt stress of modern IGBT servo drives (switching rates up to 16 kHz), resist the capacitive coupling currents that cause bearing currents, and flex continuously in drag chain without conductor fatigue.
The overall tinned copper braid provides a low-impedance return path for high-frequency common-mode currents, reducing EMI radiation from the servo power cable and protecting adjacent signal cables from interference.
Key Design Features
- Rated voltage: 0.6/1 kV — suitable for 690V servo drives
- Overall tinned copper braid ≥85% — EMI screening and HF current return
- Class 6 extremely fine-stranded conductors — continuous drag chain flex
- PUR outer sheath — oil, coolant, abrasion resistant
- Symmetric 3-phase construction — equal capacitance per phase, reduced bearing current
- Separate PE (green/yellow) conductor
- Flex temp: −40°C to +80°C; fixed temp: −50°C to +80°C
- Min bending radius (flex): 7.5×OD
Electrical Specifications
| Parameter | Value |
|---|
| Rated Voltage | 0.6/1 kV |
| Test Voltage | 4 kV (5 min) |
| Cross-sections | 4G1.5, 4G2.5, 4G4, 4G6, 4G10, 4G16 mm² |
| Conductor Class | Class 6 (extremely fine-stranded) |
| Shield | Tinned Cu braid ≥85% |
| Sheath | PUR (black) |
| Flex Temp | −40°C to +80°C |
| Oil Resistance | Yes (DIN EN 60811-404) |
Typical Applications
- Servo drive to servo motor power connection
- VFD output cable in drag chain installation
- CNC machine tool servo axis power cables
- Robotic welding servo power wiring
- Packaging machine servo drive output
- Any PWM inverter output cable in flexible application
Why Servo Power Cables Differ from Standard Flexible Cables
High dV/dt Resistance
Standard flexible cables have insulation designed for 50 Hz sinusoidal voltage. Servo drive PWM outputs apply voltage steps of 600–800V in under 100 ns — creating dV/dt values that accelerate partial discharge in non-servo-rated insulation, causing premature failure.
Symmetric Capacitance for Bearing Protection
An asymmetric cable construction creates unequal capacitance per phase, generating a net common-mode voltage that drives bearing currents. Symmetric three-phase construction equalises capacitance and minimises bearing current amplitude.
Servo Power Cable Quotesales@rvpowergroup.com — specify motor power, drive voltage, cable length, and drag chain parameters.
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