How To Size Dynamic Braking Resistors

The lower the ohmic value the higher the power. To calculate the right size of the resistor you need the characteristic data of the load cycle.

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Understanding how dynamic braking works chapter 1.

How to size dynamic braking resistors. Furthermore you need the brake power pbr and the minimum resistance value rmin which is defined by the vfd. The energy per stop the duty cycle and the ohmic value. The average values of dc bus voltages are.

V brake voltage during braking r dynamic breaking resistor rating ohms braking torque. To specify the resistor we need to know three things. Braking resistors are normally sized for the average power dissipation over the braking cycle time.

Voltage dividers reduce the dc bus voltage to a value that is usable in signal circuit isolation and control. How do you calculate the size of a dynamic braking resistor. The minimum ohms are set by the drive manufacturer and will produce braking power at the peak rating of the drive or its braking module.

Brake time or duty cycle and the total cycle time. Chopper transistor voltage control regulates the voltage of the dc bus during regeneration. Combine equations above and.

The first two are usually combined into one variable the power of the resistor. 1370 dynamic braking resistors catalog numbers 1370 dynamic braking is an optional control function which facilitates motor stopping under fault conditions or in response to a coastdb stop. Dynamic braking will not provide a holding brake function and is only effective when the motor is rotating.

Torque is in newton meters. Torque braking is the effective braking torque created by the electric motor. The ohmic value sets the rate at which we put the energy into the resistor the braking power.

A braking resistor will compensate this energy and convert it to thermal energy. This may cause a dc link voltage rise up to a critical level.

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