How To: Troubleshoot VFDs

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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.

Questions for Jason? He’s happy to help.
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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.

igormorozov

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.

philemonawoke

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.

aewcontrol

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

mdoleullah

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

abdulgaffarmohammedshafee

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

medankia

Let's talk about not wearing a metallic watch?

AndrewTa

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 ?

Alberto_Alletto