Resistor braking 343
Resistor braking
Contents of this chapter
This chapter describes how to select, protect and wire brake choppers and resistors
with the ACL30 drive. It also provides technical data for selecting brake choppers and
resistors.
Brake choppers and resistors
Brake choppers
The ACL30 drives have a built-in brake chopper as standard equipment to handle the
energy generated by a decelerating motor.
When the brake chopper is enabled and a resistor is connected, the chopper starts
conducting when the DC link voltage of the drive reaches low limit. The maximum
braking power is achieved at high limit.
Low and high limits can be calculated:
Low limit = 1.35 * 1.25 * USED SUPPLY VOLT - 30
High limit = Low limit + 60
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