WC1 Active Front End

Toshiba’s WC1 active front end (AFE) adjustable speed drive (ASD) is a cost- effective, space-saving solution designed to simplify installation while enhancing performance. Its advanced design incorporates silicon carbide (SiC) MOSFETs, which offer superior electrical and thermal performance compared to traditional silicon IGBTs. By significantly reducing harmonic distortion and eliminating the need for external filters, the WC1 minimizes system complexity and lowers upfront equipment costs. With a true sine wave output, the WC1 extends motor life and removes the need for inverter duty motors, upsizing, or additional motor accessories.

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Overview

Simplified and Cost-Effective Design 

• Returns braking energy to the grid through fully regenerative capability.
• Achieves near-unity power factor minimizing efficiency losses from excess reactive power and reducing utility costs and penalties.
• Maintains THDi at or below 5% through the 100th harmonic to support overall system compliance with IEEE 519 standards.

 

Enhanced Motor Performance and Longevity 

• Provides true sine wave 3-phase output and eliminates voltage spikes.
• Minimizes common-mode currents to prevent bearing damage.
• Operates motors 9–12% cooler in testing, helping to extend motor service life.
• Eliminates the need for motor protection accessories, such as shaft grounding rings and insulated bearings.

 

Superior Power Quality and Efficiency 

• Eliminates the need for external filters, AC reactors, harmonic filters, dv/dt filters, and ASD cables.
• Built-in filters reduce system footprint, lower installation costs, and minimize potential points of failure.

 

Intuitive Control and Monitoring  

• Remote set up, monitoring, and control functionality via the WC1 app.
• Streamlined installation and commissioning.

Insulated Bearings

  • An electric motor operating on an adjustable speed drive is at risk for premature bearing failure caused by stray currents. Experience indicates using insulated bearings on both ends of the motors is the most effective way to protect the motor from destructive currents. A high level of bearing protection is especially beneficial in applications where motor maintenance and replacement are difficult.
  • Extended Horsepower Capability

  • Extended horsepower capability allows a smaller motor to run at a higher horsepower than its baseline depending on the application requirements. This provides motor users potential cost savings while achieving the same motor performance.
  • Insulation with Wide Thermal Capability

  • Critical cooling motors utilize many Class H insulation materials in its winding designs, which provides increased thermal protection. These motors operate with a very low temperature rise at rated conditions, giving them a wide thermal margin and extended motor life.
  • Low Vibration

  • A vibration level exceeding NEMA MG1 requirements provides stability and durability by prolonging motor and bearing life and helping to reduce downtime.
  • Specifications

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