Discuss Fitting a brake resistor to a VSD in the Commercial Electrical Advice area at ElectriciansForums.net

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GNEL

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Hello, i currently have a small project where i am required to fit a brake resistor to a vsd. i dnt no an awful lot on this subject. can anyone give me an explanation?

cheers
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Guest123

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  • #2
Hey mate.

I believe brake resistors are used to dissapate the heat generated in the DC links under" hard" or "fast" braking of the VSD controlled motor.

As for fitting one I wouldn't be able to explain it without actually viewing the setup myself.

Cheers.
 
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cossiemong

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  • #3
alright mate
what kind of drive r u fitting it to, and how big is the drive?
 
S

sparky123

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  • #4
Brake resistors are used to prevent the DC Bus voltage of the drive, exceeding a preset value during the ramp down or the decel period.
Brake resistors tend to be used when you have a fairly large load that requires a fairly fast deceleration rate, without this resistor the drive may trip on an overvoltage fault during decel, this could, dependent on the application cause a safety issue should this drive trip has you will lose control of the motor during ramp down, would like to know more about the application.
 
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