Product Description
5.6 Motor Compatibility
Product User Manual
Operating Instructions, Version AE 12/2009, A5E01454341C
101
5.6 Motor Compatibility
Although the Perfect Harmony topology output voltage contains a high THDv%, the drive
was shown to have low harmonic content between the fundamental and 25
th
. The nine cell
GenIV drive was factory tested at Siemens and was found to meet NEMA MG-1 for
Harmonic Voltage Factor (HVF) < 0.03 and, therefore, motors do not need to be derated.
7+'F9
+9)
_&
K9
_
_&
K9
_
K9
K9)RXW
* Results are shown for a 1100 Hp 4160 V nine cell drive loaded at 505 kW, 86 A, and 4230 voltage output
Figure 5-30 HVF for Nine Cell GenIV
Note
Fifteen and twenty-four cell drives further improve the drive output voltage by increasing the
effective switching freuqency and using the same voltage step size with a higher drive output
voltage.
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