Toshiba QX7 Series - Manual (Page 3)

Total Harmonic Distortion (THD) can be caused by multiple factors including: computers,
fluorescent lights, copiers, and six-pulse drives. With Toshiba’s patented 18-Pulse
Autotransformer design, the QX7 removes distortion that would normally be generated by
a six-pulse drive.
• Meets IEEE-519 Guidelines without Adding Filters
• Produces a Ripple-Free Voltage on DC Bus
• Clean Sinusoidal Input Current Waveform
• Up to 60% Reduction in Transformer Losses
Truly Designed for
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
% OF FUNDAMENTAL
6-Pulse (Typical) 18-Pulse HX7
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.
• 100” Height and 24” Depth on All Sizes
• Integrated Phase-Shifting Autotransformer
• Saves Real Estate on New Designs
• Easy Replacement for Older Drives in
Existing Facilities
(Addition of a bypass option will increase enclosure size.)
!
$ 7'
3(
2% 6
"
#
$
(
'
&
%
!
#
$
%
&
'
(
%
INPUT CURRENT HARMONICS