1. REFLECTED WAVE TRAP - A Quantum Leap in Motor Protection

2. The Problem: Over-Voltage Spikes @ Motor Terminals (Reflected Waves)
Failure Threshold
(>1000 Volts) M
Drive
Reflected wave
at motor terminals
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 >50 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.

3. The Solution: Reflected Wave Trap (RWT)
Without RWT
With RWT
Patented RWT installed at motor terminals: prevent motor damage/failures

4. Benefits of the Cutler-Hammer RWT
1. One Size Fits All!
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

5. Benefits of the Cutler-Hammer RWT (continued)
3. Superior Clamping
480 Volt Application
Without RWT
With RWT

6. 4. Status Indicator Light
Benefits of the Cutler-Hammer RWT (continued)
4. Status Indicator Light
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)
6. The “Coolest” Solution
A-B normal operating temperature: °C (safety hazard, limits cable length, higher power losses)
C-H Reflected Wave Trap normal operating temperature:
< 60°C for NEMA1; <90°C for NEMA 4X
Surface Temperature (degree’s Celsius)
90°C

8. Benefits of the Cutler-Hammer RWT (continued)
7. Longer Cable Lengths, Faster Carrier Freq.
Higher carrier frequency:operates 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

9. Why RWT Technology?
The RWT is patented by Cutler-Hammer

10. Overview of Reflected Wave Solutions

11. 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)

12. Industrial Surge Protection Example