REFLECTED WAVE TRAP - A Quantum Leap in Motor Protection

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REFLECTED WAVE TRAP- A Quantum Leap in Motor
Protection
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The Problem Over-Voltage Spikes _at_ Motor
Terminals (Reflected Waves)

• Significant motor failures (insulation failure)
  caused by reflective wave spikes
• High dV/dt on PWM pulse creates over-voltage
  spikes at motor terminals.
• Occurs with cable lengths gt50 feet (between
  drives and motor).
• Per NEMA MGI Part 30 and VDE 530, motors rated
  for 600V or less withstand a peak voltage of only
  1000V.
• Existing solutions (A-B Terminator, TCI series
  filters) have performance limitations.

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The Solution Reflected Wave Trap (RWT)
Without RWT
With RWT
Patented RWT installed at motor terminals
prevent motor damage/failures
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1. One Size Fits All!
Benefits of the Cutler-Hammer RWT

• Only one model required for
• 208 to 480 Volt applications
• any H.P. motor
• any drive/motor manufacturer

2. Two Enclosure Styles

• NEMA 1
• NEMA 4X Class I, Div 2 for hazardous
  environments

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3. Superior Clamping
Benefits of the Cutler-Hammer RWT (continued)
480 Volt Application
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4. Status Indicator Light
Benefits of the Cutler-Hammer RWT (continued)

• Not available with competitor models
• Status indicator turns OFF if unit fails

5. Cost Effective, Easy to Install

• Easy installation for retrofit
• and new systems
• Mount within 25 feet of motor
• Lower energy losses

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6. The Coolest Solution
Benefits of the Cutler-Hammer RWT (continued)

• A-B normal operating temperature 125 - 220C
  (safety hazard, limits cable length, higher power
  losses)
• C-H Reflected Wave Trap normal operating
  temperature
• lt 60C for NEMA1 lt90C for NEMA 4X

Surface Temperature (degrees Celsius)
A-B _at_216C
C-H _at_ 90C
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Benefits of the Cutler-Hammer RWT (continued)
7. Longer Cable Lengths, Faster Carrier Freq.

• Higher carrier frequencyoperates up to 12 kHz
  (compared to 2 to 6 kHz for competitor design)
• Flexibility of operation enables longer cable
  lengths between drive and motor
• Eliminates cable degradation due to over voltage

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Why RWT Technology?
The RWT is patented by Cutler-Hammer
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Overview of Reflected Wave Solutions
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Additional Information on RWT Drive Applications

• RWT brochure (B.037F.01.S.E)
• Specification Guide (TD.37F.02.T.E)
• Commercial Article on RWT (AP.037F.01.T.E.)
• Installation Operating Guide (TD-37F.01.T.E)
• Industry Articles (contact Surge Protection
  product line - attn Satendra Prasad)
• Application assistance Cutler-Hammer Drive Sales
  Managers
• Stock/Price Vista registered (stocked in
  Spartensburg)

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Industrial Surge Protection Example