Application and Operation
6.16 Dual Frequency Braking
Product User Manual
152 Operating Instructions, Version AE 12/2009, A5E01454341C
frequency is always in opposite rotation to the applied motor electrical frequency (speed and
direction of the machine).
Figure "Dual Frequency Voltages Being Added Together with the Normal Three-Phase
Voltages" is a block diagram showing how the two voltage vectors (normal VA1 and loss-
inducing VA2) are added together to produce the braking function. Figure "Scope Picture
Showing Dual Fraquency Braking Waveform" is a scope picture of the two voltage vectors
added together. The higher frequency voltage waveform VA2 is riding on the lower
frequency waveform VA1.
Note
The pulsation frequency is programmable via the NXG Control, which is selectable by the
end user. It provides the reference to produce the desired additional braking for the system
and is adjustable to avoid resonance in the system.
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Figure 6-24 Dual Frequency Voltages Being Added Together with the Normal Three-Phase Voltages
Figure 6-25 Scope Picture Showing Dual Fraquency Braking Waveform
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