Resistor braking
Contents of this chapter
This chapter contains information and instructions on resistor braking, brake
choppers and brake resistors.
Operation principle and hardware description
The brake chopper handles the energy generated by a decelerating motor. 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.
Resistor braking, frames R1…R3
￭
Planning the braking system
Selecting the brake resistor
Frames R1…R3 have an built-in brake chopper as standard equipment. The brake
resistor is selected using the table and equations presented in this section.
1. Determine the required maximum braking power
P
Rmax
for the application.
P
Rmax
must be smaller than
P
BRmax
given in the table on page 400 for the used
drive type.
2. Calculate resistance
R
with Equation 1.
3. Calculate energy
E
Rpulse
with Equation 2.
14
Resistor braking 399
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