How To Test a VFD (variable frequency drive) 

Nice.simple.clear .suspect a grumpy VFD on my lovely old skool mill, this film gives me the enthusiasm to investigate .subbed.

Very useful I actually came across one today and I needed this video

excellent video learned a lot, nicely explained

Good explanation, THANK YOU!

Very good have 27kv pump motors and 12 wire soft start motors at work good testing thanks

Good video with a straight forward and simple explanation of theory. I work in hvac and run into these quite a lot. Just subbed.

Thank you for the video . The only thing I wish was you showing on the schematic which points your were testing between a little more clearer. Otherwise I quite enjoyed your vid . Thank you for your effort to teach us things the technicons failed to do

Very nice. Helped a lot. Thank you. In my VFD 9600D-1T-00220M case, the brake resistor is internal. It has two output connectors to attach an external resistor but was internally not wired, so I had to open it to access P+ and P-.

Nice one, I have an issue with a seimen 120 ac drive. When you put power on the 3phase incoming I don't get a DC voltage on the capacitor side.

Great Content Learned Alot

"They explode a bit and let the smoke out.." LMAO...

Wow great tutorial.. please make more educational video.. you deserve to be subscribe.

Good Teaching! Just A Tip For The Young Bucks & Doe's Out There! When Your In Industrial Manufacturing As A Technician Responsible For Troubleshooting, Fixing And Preventive Maintenance Of Equipment. Your Ultimately Responsible For Optimum Up Time, Output And Quality Of Equipment And The Products Being Produced & Processed! Therefore, There's Not Much Time In Production For Testing & Troubleshooting! Remove Smoking, Burnt Defective Modules, Assemblies, Devices, Etc! Swapping Them With New Ones Whenever Possible! Once Verified The Equipment Was Up And Running In Optimum Condition By Troubleshooting With New Modules Along With All Other Equipment Of Responsibility Being Up And Running! Take The Suspect Modules, Etc, In Engineering/Technicians Lab To Repair By Opening And Removing, Replacing Said Burnt Defective Components! Then, Test As Needed Or You Could Send Them Out For Repair Or Replacement To Vendor(s) Depending On Free Time Of Up/Down Time Of High Volume Production Equipment! Most Of The Time As A Technician You Have To Learn To Put Out The Fire(s) And Read Every Vendor(s) Machine And Equipment User/Troubleshooting And Repair Manual You Can! The Internet Wont Always Be Here Or Up & Available Due To Censorship Or Who Knows What!?! Thus, There's Always Time To Learn To Wash, Polish And Wax The Fire Truck After It's Repaired, Maintained & In Working Order If You Spend Time Wisely Reading The User & Repair Manuals! 😎

Nice video - maybe you will be interested to know that the wiring in the bridge rectifier is what "magically" turns AC into the full wave rectified DC . The capacitor takes this wavy DC and then smooths that into the power that is used on the DC bus . The bridge rectifier wiring does some crafty re-routing to achieve this which had me confused for a while .... how does negative become positive ?? Regardless of the side that the AC wave is on compared to the zero volts line it is all voltage potential so half of the bridge flips the lower ( negative part of the AC wave ) up to the top to give you full rectification - no gaps ! Hope that helps

So when your checking reverse bias, you want an infinite or OL reading?

When you call those a bridge rectifier, is that the same thing as SCR silicone current rectifier

can you show how find out the kw of a vfd that has no data plate ?

Panel got 'cleaned' 😂. I know exactly what you mean! 'hygiened' by any chance 😂

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