Title: REFLECTED WAVE TRAP A Quantum Leap in Motor Protection
1REFLECTED WAVE TRAP- A Quantum Leap in Motor
Protection
2The 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.
3The Solution Reflected Wave Trap (RWT)
Without RWT
With RWT
Patented RWT installed at motor terminals
prevent motor damage/failures
4 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
53. Superior Clamping
Benefits of the Cutler-Hammer RWT (continued)
480 Volt Application
6 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
7 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
8Benefits 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
9Why RWT Technology?
The RWT is patented by Cutler-Hammer
10Overview of Reflected Wave Solutions
11Additional 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)
12Industrial Surge Protection Example