Options
‑106‑
Note
● The default initial braking voltages of built‑in braking units are 760 V and 350 V on the
380 to 480 VAC models and 200 V to 240 V models, respectively.
● The external braking units MDBUN‑60‑T, MDBUN‑90‑T, and MDBUN‑200‑T have a default
initial braking voltage of 670 V and are applicable in scenarios where the input voltage is
no greater than 440 VAC. The external braking units MDBUN‑60‑5T, MDBUN‑90‑5T, and
MDBUN‑200‑5T have a default initial braking voltage of 760 V and are applicable in
scenarios where the input voltage is above 440 VAC. You can adjust the initial braking
voltage based on the grid voltage. Higher initial braking voltage requires higher braking
resistance.
● The preceding table is for reference only. You can select any resistance and power as
needed. (Note that the resistance cannot be lower than the recommended minimum
value, whereas the power can exceed the recommended value.) The braking resistor
model should be selected based on the generating power of the motor in the actual
system and is also related to the system inertia, deceleration time, and potential energy
load. Select a proper braking resistor as needed.
● A larger system inertia requires shorter deceleration time and more frequent braking. In
this case, select a braking resistor with higher power and lower resistance.
Note
For installation and use of MDBUN, see
MDBUN Series Braking Unit User Guide
.
5.4.6 AFE Unit
The active front end (AFE) is an optional unit used to feed the energy generated by
the motor during braking back to the power grid. This eliminates the needs of the
braking unit and braking resistor and reduces heat emission. Inovance AFE features
high energy efficiency, low noise, low harmonics, and high power factor.
Note
The optional AFE unit is not available for T13 models.
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