VFD Accessories

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High performance variable frequency drive makes a measurement of the torque through the current to control the brake, for other it's based on speed reference. Then it depend the brake to stand still the motor or decelerate the motor and stop him. When using a DC brake always clearly define what you want to do (stand still or decelerate), then if it's a safety material, then check drive control type.
AC reactors reduce harmonics, mitigates transient conditions and helps to maintain proper phase to phase voltages. DC reactors will also mitigate harmonics however it will provide more harmonic attenuation than a equally sized AC reactor.
Both reactors will increase the conduction angle of the DC current pulses flowing through the rectifiers and thereby reduce the harmonics on the supply.
service VSD blog: A deep observation of automation control industry, especially in AC motor variable speed drive for industrial motor controls.

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