HOW TO TEST IF A VFD ( Variable Frequency Drive ) IS BAD WITH A MULTIMETER
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- Опубликовано: 25 июн 2024
- In this video you will learn how to test VFD with a Multimeter.
learning how variable frequency drives operate and how to troubleshoot if they are bad or not.
I will give a quick lesson on what a VFD ( Variable Frequency Drive ) does and the basics on how they operate normally. Because it is better to understand what and how it works before working on them
Then we will move on to the troubleshooting portion of the lesson with a little bit on how this VFD Failed which was Water Damage most of the time when a VFD fails the primary cause is external meaning someone splashed it , the area is humid and the heat from the motor is causing steam so on and so forth
Small quick shoutout to the best in the business in my opinion @fluke multimeters
Thank you for watching
John spier aka Warhammer Electric
#fluke #meters #vfd #variablefrequencydrive #electrical #hvac #electrician 
Хобби
Great video! Thank you for sharing.
Nice 👍 definitely needed to see this video thanks man
that would be "transistor" not transmitter for IGBT, and thanks for the video
Lol oversight , but yup !
Great video
Thanks bro for the info and time share
Very welcome thank you for watching
Thank you
Very welcome thank you for watching I appreciate it
👍👍👍
I dont understant why your not using the diode feature of that meter to do the troubleshooting.
Why you choose negative frim drive to make check with l1 l2 l3 and u v w ?
Negative or positive meter leads shouldn’t matter where you put on terminals if it’s selected on OHMS.
I thought when the neg probe is on DC- it should be infinity? Shouldnt you see numbers/measurements at first until it hits O/L?
Its not really AC but Pulsed DC that goes into the motor.
Pulse width modulation. Is a good concept to understand. PWM.
Do you use positive to negative dc and positive dc to negative terminal
Red on DC Negative gives you numbers that should be the same
Black on dc negative you should read “OL” on all the AC terminals
i think hes using the how to test a diode technique to tell whether the diodes are bad or not because if they are bad they wont convert the ac to dc properly and i believe fry electronics. if i remember right the anode is the positive side and cathode is negative if you put your black on the negative end and red lead on the positive end electronics flow should be .6 voltes for a silicone diode. reverse the leads and you should see OL no voltage should flow if its working correctly. diodes only allow voltage to flow one way so when you see them flow both ways or not at all you know they are bad. he could probably open it up and desolder and solder the correct rated diodes but if your an amatuer and dont want to risk damaging expensive motors id take it somehwere to be done if its cheaper.
Im still confused on why you're testing between AC and DC. I understand the drive is converting the AC to DC, and then back to AC. But its done all internally. Aren't those DC terminals used for 24v for the drive? I guess i just don't understand the relationship between the AC and DC terminals.
The DC terminals are for the DC bus, not 24VDC IO power. Those would be on the IO terminals. This is the rectified DC bus shown on the center of the schematic that the VFD uses to invert to PWM AC.
why negative is ol negative to negative
I can not hear your voice. Increased volume
The video is not bad but I literally don't understand everything..
Can you speak up I can't couldn't hear.
Gosh darn iPhones sometimes they work other times they don’t I apologize