How To: Troubleshoot VFDs

In our “How To” series, we speak to some of Radwell’s resident experts for technical information about industrial automation equipment and repairs.
In this video, Jason Larsen, Director of Technical Business Development at Radwell International, shares techniques for troubleshooting VFDs.
VFD Troubleshooting Guide: solutioncenter.yaskawa.com/se...
Questions for Jason? He’s happy to help.
Contact Information
email: [e-mail]
ph: 609.332.4336 X 578
Need Repairs?: www.radwell.com/en-US/Service...
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[@igormorozov6801]

An excellent explanation of the primary diagnostics.
Would like to hear about more about diagnostics of the condition of the motor windings and DC bus capacitors in a vfd.

[@RadwellTV]

Possibly in a future video :)

[@emiliohuerta2658]

thank you Brother. God bless you

[@niloyu105]

Thanks very informative troubleshooting guide ❤👍

[@RadwellTV]

Glad it helped

[@niloyu105]

Hi Sir I'm in process of troubleshooting of VFD...
Trouble shows
1. Input 380 ok but there is no voltage reading DC output to bridge type/ rectifier diode which is should be give supply voltage to Capacitor. Input of rectifier diode (380v) rectifier diode found two wire going to Magnetic contactor...
My question is there a related from contactor wiring that can cause Zero VDC or no reading at all thanks hope you understand what I mea..
Note: no output voltage ACV that supply to motor... And there is LED Alarm display indicator from display panel. Thanks

[@philemonawoke]

Thank you so much for your primary parts of explanation but what about secondary ( Inverting parts or IGBT parts ) of VFD. I am confused all ways please help me how to test it. Thank you.

[@mdoleullah9724]

why come err 7 in vlt 2800 vfd 11 kw, input vot ok and control card and parameters ok.

[@medankia8003]

Hi Sir, i checked in coming power L1 L2,L3 450 V but power out to load reactor is 48 V. And my motor did not turn on. Could it be the defective vfd or need to reprogramed? Whats your opinion on this one? Thanks in advanges

[@RadwellTV]

It would be a good idea to directly message Jason Larsen (the narrator of this video) with any specific questions. You can reach him at [e-mail]

[@abdulgaffarmohammedshafee9333]

If IP Address not configured will it show mobile HMI fault VFD

[@Alberto_Alletto]

Hi! In my vacon nxs have a strange problem… When push start by external command on display i see RUN…but the motor not start.
After 1/3 hours it start…
No fault on display, only custom error (i think):
Leakage
Low pressure
The motor is a turbine.
Have you idea about this problem ?

[@RadwellTV]

If you reach out to Jason Larsen, who stars in this video, he may be able to assist. You can reach him at [e-mail]

[@p..s______3009]

QUESTION ABOUT HOW WE CAN FIND SCHEMATIC DIAGRAM OF THAT PARTICULAR MODEL??
PLZ MAKE VIDEO ON THAT

[@RadwellTV]

We don't offer that. However if you go directly to the manufacturer, they should be able to help you get what you need.

[@bryanalvarez6161]

how do you check the AC is it hooked up to power ?

[@RadwellTV]

If you reach out to the video host Jason, he can answer any specific questions. His email is [e-mail]

[@FilimonZeray-vh5ej]

Have u anyone software to diagnosis vfd control card? help me

[@jhemmtallo7776]

Good morning sir, how do i repair an OL1 always trip off thnk you

[@RadwellTV]

You can message Jason Larsen, the host of this video, with specific questions. He can be reached out [e-mail]

[@jasonjohnsonHVAC]

A signal generator can also be a useful tool to help troubleshoot

[@RadwellTV]

True- thanks for your input.

[@Jason-wc3fh]

Yeah. Lots of us HVAC techs are always walking around with our trusty signal generator, just waiting to use it.

[@igormorozov6801]

What is a purpose of a signal generator in diagnostics of VFD?

[@aewcontrol2984]

You really need an oscilloscope, check the input and outputs of the rectifiers, dc bus, and inverter SCRs and IGBTs. It is important to have the specs of normal values. And not blowing up your oscilloscope it’s important too.

[@goaliedude32]

Are you in the US? I'm working in manufacturing maintenance and our company spends hundreds of thousands of dollars for drive guys to come in and troubleshoot because nobody knows how to do it in house.
My question for you would be are you hiring? I would almost love to work for a company that can refurbish/install/validate drives. Or what courses would you recommend me taking to become a drive expert?

[@Aerobix]

Was hoping for a repair video but you just sell your services here lol.

[@RadwellTV]

Well, we do, after all, do this sort of work. It's more about troubleshooting than an actual repair, as the title says. Maybe the troubleshooting will be helpful for you some day. We hope so :)

[@Aerobix]

I am still learning about VFDs so I appreciate all infos around it. I am sitting on a box of Lenze VFDs and I am about to find out which test environment I am going to build with a 3-phase motor.@@RadwellTV

[@RadwellTV]

We understand. If you want to message Jason Larsen you can do so at [e-mail] --tell him you saw his video

[@andyneville8001]

@@RadwellTV Thanks you for making this video on basic TROUBLESHOOTING. I needed somewhere to start and this was very helpful.

[@RadwellTV]

Thank you! We're glad you found this helpful.