LUTZE DRIVEFLEX® Cable for VFD and Motor Applications

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LUTZE DRIVEFLEX® Cable for VFD and Motor Applications

Variable frequency drive (VFD) cables have distinct advantages over traditional cables when used in drive and motor applications. When installed properly, VFD cables reduce cross coupling between drives and the shield contains and drains the electrical noise created by the drive. Their noise mitigation helps with the proper function of adjacent control systems and they help to reduce motor shaft voltage and bearing currents.

LUTZE DRIVEFLEX® cables are designed to cope with the power distortions in VFD applications. They offer superior electrical values for VFD or servo applications and are UL listed type “Flexible VFD Servo Cable, Flexible Motor Supply Cable” to comply with codes and standards regarding electrical wiring of VFDs. DRIVEFLEX® XLPE insulation has very low capacitance, high impedance and high voltage breakthrough resistance.  DRIVEFLEX® cables are safer and more efficient compared with traditional PVC/Nylon power tray cables or THHN wires in conduit.

LUTZE has recently expanded their DRIVEFLEX® line to include series A106 and A107, which are smaller diameter, general purpose series drive cables. Which type you use will depend on your specific project and requirements.

  • A106 series is great for most VFD applications and motors up to 40 HP and features a small outer diameter (OD) for easy routing and use in conduit.
  • A107 series cable is similar to the A106, but includes one shielded pair for brake or control signals.

Don’t trust your VFD and motor operations to tray cable or THHN.  Interested in learning more about DRIVEFLEX® or ordering it for your next project? Give your French Gerleman Account Manager a call today!


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Electric Motor Bearing Failure and Use of the Proper VFD Cable

What causes bearing failure to occur between the variable frequency drives (VFD) and electric motors?  What can be done to minimize the potential for failure?

ball bearing

For starters, the ball bearing is the connection between the shaft and the motor frame.  There are two rings: an inner ring (which is in contact with the shaft) and an outer ring (which is in contact with the motor frame).  The shaft turns due to electromagnetic interaction between inductors on the shaft and inductors on the frame. When the shaft turns, it drives the machine.

The problem lies in the connection between the VFD and the motor.  The VFD send power to the motor and some signal contents reflect off the motor and move back towards the VFD.  The reflected waves collide with the upcoming waves and this causes high voltage spikes.  The high voltage spikes cause strong electric fields which then influence the motor.

The voltage spikes and strong electric field then produce a high frequency flux around the stator.  If this frequency flux becomes high enough to overcome the impedance of the bearings’ oil film, a current starts to flow.  The end result is spark erosion.  Tiny metal particles of steel balls and rings melt and the bearing eventually fails.

LUTZE Driveflex VFD XLPE A216

However, LUTZE has come up with the perfect solution and that is to minimize the electric field.  A symmetrical construction results in a smaller electric field. The DRIVEFLEX® A220 is the most capable solution thus far of preventing bearing currents.  It connects all three earth wires and connects the cable shield to PE on both cable sides.

So, there you have it! LUTZE has created the solution to your bearing current problems with the DRIVEFLEX® A220.

LUTZE presented this information in an educational session at our recent Product and Technology Expo.  Check out the full presentation here.

Are you interested in learning more about this VFD cable solution?  Contact your French Gerleman Account Manager or contact us.

 


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Product Spotlight: LUTZE DRIVEFLEX®

Lutze

New from LUTZE is their DRIVEFLEX®, the most flexible drive cable in its class! DRIVEFLEX® is a family of drive cables designed to meet the unique electrical challenges in VFD and Servo applications. All DRIVEFLEX® cables use a special formulation of cross linked polyethylene insulation (XLPE), which provides exceptional electrical characteristics while maintaining superior flexibility.

Advances in VFD cable design offer the safest and most reliable solution to wire AC motors to VFDs, saving your time and avoiding safety hazards.

LUTZE Driveflex VFD XLPE A216

What can you use DRIVEFLEX® for and what are the benefits?

  • For VFD, servo and motor applications
  • For harsh industrial environments
  • For operating conditions with high interference noise levels
  • Specially formulated jackets for oil resistance and easy strip design
  • Sunlight resistant
  • XLPE thick wall insulation with low capacitance
  • Designed for long cable runs
  • UL listed “Flexible VFD Servo Cable”
  • WTTC for use in wind turbines
  • NFPA 79 compliant for wiring of industrial machinery
  • TC-ER for use with cable trays without conduit

5 reasons why you want a “true” and modern drive cable like DRIVEFLEX®:

  1. UL listed “Flexible VFD Servo Cable” for its intended use as VFD and servo cable.
  2. High impedance values and low capacitance values.
  3. Very flexible for routing and easy to strip. There is no conduit needed due to TC-ER listing and it is faster to install.
  4. Cuts down on electrical noise thanks to foil and braid shield.
  5. It provides the safest and most reliable connection from your drive to the motor.

Ready to learn more about DRIVEFLEX® or to place an order? Give your French Gerleman Account Manager a call today or contact us.