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The use of an AC/DC AFE permits a controlled voltage level of the intermediate power (DC Bus) and
raises to best control the motors winded to a voltage close to the line voltage. The drive’s dynamic
behavior results in a way that optimizes the work as motor or generator.
There is a possibility to connect more than one drive to the DC Bus, with the advantage of energy
exchange between drives in case of contemporary movements and only one energy exchange with
the mains.
2.3.1.3.2 BRAKING WITH DC BUS CONTROL (C47=1)
A further possibility of recovery control of kinetic energy exists: if the outer braking resistance is not
present (or is not working properly), it is possible to enable (setting C47=1) the braking with DC Bus
control. This function, when the Bus voltage reaches the threshold set in P123, limits the maximum
admitted regenerated torque, slowing down the motor. In practice, the motor will slow down in
minimum time thus the over voltage alarm does not start.
This function is not active by default (C47=0) in a way to leave the intervention of the braking circuit.
speed
Controlled braking of the DC Bus
DC bus voltage
P12
time
speed
Recovery of mains energy
DC bus voltage
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