How To Address DC Bus Faults And Dynamic Braking Modules

About This Video

This video covers how to address DC Bus Faults you may encounter when working with a variable frequency drive (VFD) including whether or not to use a dynamic braking module. Although many DC bus faults may require a repair of the drive, it’s important to remember that the primary cause of a DC Bus fault is too much deceleration on a high inertia load.

Warning: All electrical equipment should be handled by qualified electricians. Make sure to adhere to all local, national, and international safety laws when handling your equipment. Failure to do so could result in severe injury or even death.

Deceleration can be reduced significantly. Something to take into consideration though is if you have a high inertial load (in other words like a lathe – something that’s very heavy), the faster you attempt to stop it the more energy that’s going to get pushed back up into the drive. The drive can fault out on something called a DC Bus Fault.

A couple of ways to fix that is obviously you can extend out your deceleration time [and] be a little more patient with it. It’s actually better on your drive to wait longer to stop. The other option is a dynamic braking module, which will actually absorb that extra energy that is coming out of it.

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