If you're a regular follower of 'My Automation Education' you know that last week we talked a little bit about Variable Frequency Drives (VFDs). We are going to dive a little deeper into AC drives with this post: focusing on the basics of how to select one.

After establishing that you have an electric motor, you need to determine your motor's horse power. Next, the input (voltage/amperage) to the motor needs to be established. In addition, you need to know if the input is single or three-phase power. Lastly, things like the application of the device will determine what type of housing the drive may need to be in  (NEMA 1, NEMA 4X, etc...).

These are just the basics of determining which drive is correct for your application. If you still are not sure call one of the fantastic technical team members we have here at Marshall Wolf Automation. As a stocking distributor of AC Tech, Fuji, Hitachi, and Delta drives, Marshall Wolf Automation should be at the top of your list for all your industrial automation needs.

Tune in down the road for future chapters in 'My Automation Education'. Here is some basic information on NEMA ratings as well:

NEMA Ratings for Variable Frequency Drives:
NEMA 1: for indoor installation in a relatively clean environment,
provides limited protection against falling dirt.

NEMA 12: for indoor installation, provides protection against circulating dust,
falling dirt and dripping, non-corrosive liquids.

NEMA 4: for indoor installation, provides protection against windblown dust and rain,
splashing water, hose-directed water and damage from external ice formation.

NEMA 4X for indoor installation: NEMA 4 protection (see above) plus
protection against corrosive or caustic agents.

NEMA 4X for indoor/outdoor installation: NEMA 4 protection (above) plus
protection against corrosive or caustic agents.