Resistor braking
Contents of this chapter
This chapter describes how to select, protect and wire brake choppers and
resistors. The chapter also contains technical data.
Operation principle
The brake chopper handles the energy generated by a decelerating motor. The
extra energy increases the DC link voltage. 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.
Planning the braking system
The drive needs external brake chopper and resistors.
￭
Selecting the default brake system components
1. Calculate the maximum power generated by the motor during braking.
2. Select a suitable drive, brake chopper and brake resistor combination for the
application from the brake ratings table in the technical data. The braking
power of the chopper must be greater than or equal to the maximum power
generated by the motor during the braking.
3. Make sure that the resistor selection is correct: The energy generated by the
motor during a 400-second period must not exceed the resistor heat
dissipation capacity
E
R
.
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Resistor braking 243
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