✔ Dynamic Braking Resistor Chopper Module

Japanasiapacific rim china india japan korea singapore taiwan. The combination of switching device and control circuit is generally referred to as the chopper module while the resistor is referred to as a dynamic brake resistor dynamic brakes are typically rated for duty cycles in the 20 percent range and choppers are often used in heavier duty applications.

Application Description

Dynamic Braking Resistors

How to select a dynamic brake module in general the motor power rating speed torque and details regarding the.

Dynamic braking resistor chopper module. When the drive system is with vfd drives this braking work is usually done by means of a dynamic chopper and resistor grids or resistor banks or a regenerative dynamic brake. While a regenerative dynamic brake may recover 90 95 of the mechanical energy. Figure 3 selecting a dynamic brake module.

Braking choppers are automatically activated when the actual dc bus voltage exceeds a specified level depending on the nominal voltage of the variable frequency drive. A braking chopper is an electrical switch that limits the dc bus voltage by switching the braking energy to a resistor where the braking energy is converted to heat. The braking module contains the power electronics and the associated control unit.

I want to design a standalone dynamic braking circuit for ac motor driver because to deal with regenerative energy that the ac source cannot handle causing a dc bus voltage rise. 100 pl peak load in of dynamic brake resistor p peak braking power calculated in step 2 watts. The supply voltage for the electronics is drawn from the dc link.

A braking module and an external braking resistor is required in certain cases when the drive is to be braked or brought to a standstill eg emergency stop category 1. Europeafricamiddle east germany israel uk. Yaskawas line of system components include dynamic braking and regeneration converters.

Module and dynamic brake resistor as a rule a chopper module can be specified when regenerative energy is dissipated on an occasional or periodic basis. Chopper module with a separate dynamic brake resistor. The dynamic braking resistor is connected across the dc bus and will see voltages as high as 800 volts.

Dynamic braking resistors are used with ac vfds to produce a braking torque in the motor during overhauling conditions. The concept is well established in many resources online that senses the dc bus voltage and dissipates the access energy in a brake resistor. The drive manufacturer normally determines the power rating watts needed to prevent overheating during braking duty.

In general the motor power rating speed torque and details regarding the regenerative mode of operation will be needed in order to estimate what chopper module rating and dynamic brake resistor value to use. When the drive detects a regeneration condition a control signal is sent to the brake chopper. Dynamic braking brake chopper module the brake chopper module is an open style chassis mount assembly that can be used with properly sized braking resistors to increase the braking torque capability of the phoenix dx and ex drives.