Resistor braking
Contents of this chapter
This chapter tells how to select, protect and wire brake choppers and resistors. The chapter
also contains the related technical data.
When is resistor braking necessary?
Resistor braking is necessary for high capacity braking if a regenerative drive cannot be
used.
Operation principle and hardware description
The drive can be equipped with an optional built-in brake chopper (+D150). Brake resistors
are available as add-on kits or factory installed (+D151).
The brake chopper handles the energy generated by a decelerating motor. During the
deceleration, motor generates energy back to the drive and the voltage in the drive
intermediate DC link starts to rise. The chopper connects the brake resistor to the
intermediate DC circuit whenever the voltage in the circuit exceeds the limit defined by the
control program. Energy consumption by the resistor losses lowers the voltage until the
resistor can be disconnected.
15
Resistor braking 261
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