Theory
3.2 The Power Circuitry
Product User Manual
40 Operating Instructions, Version AE 12/2009, A5E01454341C
Harmony Input Waveforms for a Drive at Full Load
Note in Figure "Harmony Input Waveforms for a Drive at Full Load" that the input current
lags behind the input voltage by less than 15 degrees at full load. This represents a power
factor better than 96 percent. Harmony series drives always maintain a high power factor,
typically better than 95 percent throughout the speed and load range.
Note
The waveforms shown represent the worst case for a Harmony series drive when there are
only 3 cells per phase. When the number of cells increases, as in 12 or 15 or 24 cell drives,
the waveforms improve considerably.
Figure 3-7 Motor A-B Voltage and Current in Phase C at Full Load for a Harmony Drive
The above figure shows the motor voltage and current for a 15 cell Harmony drive at full
power.
Figure 3-8 Input A-B Voltage and Current in Phase C at Full Load for a Harmony Drive
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