Total Harmonic Distortion (TDHE) can come from many sources, including computers,
fluorescent lights, copiers and six pulse drives. The W7, with Toshibaʼs patented 18 Pulse
Autotransformer design, removes this concern.
• Meets IEEE 519 Guidelines without Added Filters
• Produces a Ripple Free Voltage on DC Bus
• Clean Sinusoidal Input Current Waveform
• Up to 60% Reduction in Transformer Losses
The Drive Solution for Water and Wastewater
INPUT CURRENT HARMONICS
0
10
20
30
40
50
60
70
80
90
100
5
7
11
13
17
19
23
25
29
31
35
37
41
43
47
49
HARMONIC NUMBER
6 Pulse (Typical)
18 Pulse W7
e
: 60 Hz
@
: 113 Hz
Ch1
500mV
Ch2
5.00mVΩ
M2.00ms
Ch1
10mV
Current
Voltage
Small Footprint
The high cost of real estate and constraints
of existing facilities make size an important
consideration in drive selection.
- 400 HP Drive Only 42” Wide
- 24” Depth on All Sizes
- Integrated Phase-Shifting Autotransformer
- Saves Real Estate on New Designs
- Easier Replacement of Old Drives
in Existing Facilities
• 60-200 HP: 100”H x 30”W x 24”D
• 250-400 HP: 100”H x 42”W x 24”D
• 500-800 HP: Consult Factory
(Addition of a bypass option will increase enclosure size)
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* US Patent 6396723
JP Patent 2000-179543 (Pending)
