Post Glover DB22D0-2K77-10400AA0 , Dynamic Braking Resistor, 22 Ohm Resistance, 3,221 Watt, 21" X 5" X 13". We are going to let you in on a little secret in the Braking Industry.  Manufacturers of Variable Frequency Drives would like you to believe that their Dynamic Braking Resistors are made for their drives only.  Well, they are not.  All we need to know from you is the Ohms and the Wattage you require, and we will custom-fit a Dynamic Braking Resistor for you.  Our prices are great, we ship the same day (if the order is received before 2:00 PM Eastern Time), and the quality is Post Glover.  What more do you need ?  Just call and we will ship....it is that easy !

State of the art AC Variable Frequency Drives (VFD) are commonplace today, creating the need for reliable, proven Dynamic Braking Resistors that can be delivered quickly, completely assembled, and ready for convenient installation at the job-site. Dynamic Braking Resistors are used with AC VFD's to produce a braking torque in the motor during overhauling conditions. The dynamic braking resistor is connected across the DC bus and will see voltages as high as 800 volts.

The drive manufacturer normally determines the power rating (watts) needed to prevent overheating during braking duty. The peak braking current is determined by the specified resistance value. Each drive manufacturer specifies a resistance range with a minimum to prevent overcurrent and damage to the drive and a maximum value to give adequate lower dissipation capability.

A three-phase variable frequency drive (VFD) consists of three basic components - rectifier, DC line, and inverter - and a control system to manage these three components as illustrated. The rectifier converts the three-phase 60Hz AC input to a DC signal.

Depending on the system, an inductor, a capacitor, or combination of these components smoothes the DC signal (reduces voltage ripple) in the DC link part of the VFD. The inverter circuit converts the DC signal into a variable frequency AC voltage to control the speed of the induction motor.