How to troubleshoot and diagnose a non-working VFD
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- Опубліковано 31 лип 2024
- Talk to a sales engineer at VFDs.com 800-800-2261
Is your VFD not powering up? Are you getting an error code? Or is it running rough? Troubleshooting can be a long process. In this video, our VP of engineering Craig Hartman goes through a basic step by step guide inspecting different parts of your system in order to diagnose a non-working VFD or VFD panel.
When you inspect any electrical equipment, make sure you follow the safety procedure at your facility and wear proper protective equipment (PPE).
Craig used an MDI 350HP pump and fan VFD panel for demonstration in the video.
Check out similar panels here: www.vfds.com/mdi-ff1-panels
MDI website: www.drivingindustry.com/
If you can't figure out the problem, you can get tech support from our experienced engineers here: www.vfds.com/technical-support
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Wow! Absolutely amazing, fabulous!!!. This is how you explain the concepts -- clear cut, right to the point, no beating around the bush, etc. I wish others watch this video and learn how to make educational videos..
this is a great presentation thanks, for all the info, made me a smarter person.
Great effort and professional explanation
Thank you sir
Great educational video man.
Excellent video!
Nice little video with great tips, thank you!
Very much appreciated. Covered a bunch of info in a short time. Thanks
Makes the job so much easier if, for example, the vfd reads a ground fault present. It allows you to make straight to that 3 phase motor and it's wiring,. Easy continuity testing. Such a help!
Great Profesional explanation!!
Now you made me smarter ...thank you
Great info! Thank you
Very Educational
Also, when you shut down a VFD, you should wait at least 10 minutes as most of them hold a charge that will dissipate through a resistor. If you go touching things right away because you have opened the disconnect, you could do the electron boogie for a few seconds. And that's worse than the chicken dance...
Right
Allow for failed bleeder resistors. Use a voltmeter (rated for at least 500V) to check the capacitor voltage, which may exceed 320VDC when powered, before sticking your fingers in there. Stay clear of anything over 40V or so! AC 'tingles'; DC contracts your muscles and overrides any (millivolt) signals from your brain: your muscles won't let go! Bit awkward, that.
A relative opened up a camera flash unit that had been off for a day (they don't have bleeder resistors to discharge them). He must have touched the charged capacitor; he doesn't *usually* scream loudly like that...
@@scottwillis5434 yes sir.... Right
@@scottwillis5434 500v rated meter. The DC bus on a 480V AC input drive is about 680V DC 🤦♂️
I used to repair mitsi drives for a living...many moons ago when vf control was the defacto. This guy is exactly right in his explanation.
If I could add a couple of points:
1. Smell the drive.....if it has a "burnt" smell then its usually the power section and chopper section blown. You can sometimes see the power device sidewall blown out, exposing some white smoky looking gel...maybe this has changed on the newer devices.
2. A faulty drive has a certain squeaky sound....unfortunately that a difficult one to explain I could diagnose a faulty drive just by the way it sounded..it was usually the capacitors on the chopper boards. Mitsubishi used to pull the gate signal slightly negative to switch the power devices off.
I doubt I could hear a faulty drive now and the newer power devices are much better at switching on and off.
Anyway, that was many moons ago my exposure to industrial drives is now a button/parameter checking thing and this in its own right can be the difficult thing you have to find the right parameter but the fundamental principles stay the same
But to the good gentleman explaining this video you are spot on.
Hello sir, what would be the problem for a vfd that is getting the dc bus voltage directly to the vfd output. Im getting 650vdc in u v w?
@@technologytijuana ...didi you chck for a short from the DC bus to UVW...
Obviously let it discharge first
Good explanation thank you
Thank you sir, good and to the point information
Good stuff. Thanks for sharing.
It very good explanation I enjoy it very much.
Hey great video! Knew a lot of this before hand, but it was a great wrap up of a lot of basic issues. Any chance you have a video on VFD motor protection programming?
Great video
Good explanation
Sir your explanation is simply great. .God bless you.
Hi, I like your lecture. Thanks
The way to solve problem is so simple, the complicated is the detail of parameters of each brand, How many brands in the market may be 100 brands
Craig, I know the drive is not powered up, but watching you touch the U, V, W busses makes me jump. Haha! Great video.
Thanks sir for this information.
Thanks guys
Great info
great thanks sir.
hey man
you are the best
While the motor was disconnected and the drive was off you can also check the gates on the IGBTs with your meter on diode check, you can check the capacitors across the buses somewhat, you could also check the MOVs and the rectifier with a diode check as well.
THANK YOU SIR,,i have a problem with VFD is not working and the MCCB is burned ,,so what could be the causes of this issue?
Have an old Toshiba g2+. OC3 fault. No motor attached, still can't clear the fault?
VFD Repair - Industrial Solutions Authority, Hamilton Ohio, USA - Best turnaround time in the industry. Be sure to tell them Rich sent ya.
Hi good morning I'm starting with vfd what book you recommend me
pleae help meguys > i have mishubish A700 vfd but when i start it it only runs for 10 minutes then it trips, the it dispalys the OP3 ALARM , what could be the problem and what could be the cause
nice info sr
before vfd run Earth nutral viltage 1V, after vfd run Earth to nutral voltage 14/15 Volt-i need to solution please explain.we give Earth connection properly VFD to Motor. we use SUBMERSIBLE MOTOR.
Sounds great
How can a normal vfd be able to put power back into the grid?
It can't because normally on the utillity side of the DC bus is no inverter to do so.
But if the motor feeds into the drive You could have a break resisor or DC break.
Otherwise the drive will trip and let the motor free run
thank you
Thank you Sir
Great Thanks!
What is the best oscilloscope for troubleshooting a vfd?
On a mitsubishi inverter, 9999 in a parameter means it's set to dataplate ratings by default. Setting a 'real' value in there is usually a precursor to sensorless flux vector mode. Setting these away from 9999 must be followed by a flux vector autotune
Thank you for your explain. i have a question . pls . a VFD can work with the dc source. if so can you give us clarificatons
thank you .
Most VFDs out there are AC but some manufacturers make DC VFD. For example, Emerson has 2 lines of DC VFD.
thank you
Dear sir vfd frequency going to low in auto mode what case this?
My Mitsubishi vfd goes back to default setting if I turn the power off to the vfd. Is that normal???
Do these work well with a 480 3phase generator?
Running motor suddenly stop Vfd Display show, Err F 1301, what's the problem? Please tell me.
Can you explain why the power supply may be overvolting at night? I missed this concept somehow
awesome sir thank yoi
how can i reset a allen bradley 1336 plus to factory settings?
3 phase motor don’t run, VFD display show `fault` and E l l, what's the problem?
What if the VFD shows its running but there is no power coming out from the output phases. even though the VFD shows running . But when checked with a multimeter the VFD output to the motor itself has no power coming out of each phase..
Thanks sir
where can I find water-cooled VFDs?
I HAVE REPLACED AN FR-A700 WITH AN FR-A800 AND ENTERED THE SAME PARAMETERS THAT WAS IN A FAULT A700 INVERTER BUT THE DRIVE IS NOT WORKING.WHY?
Hie can i run a say 1.5 kw 3phase motor with a petrol gen single phase using vfd? Anybody plz
Maybe you can describe how to check the rectifier bridge, if the SCRs are shorted and the capacitor in the next video. Also, before powering on the drive, you should always ohm the input terminals if they are shorted. Those are main causes of drive failure.
Allan Valdez That's the video I'm looking for
Allan - worked on many of these as a locomotive tech. Yes, the SCR/diodes fail more than anything. Basically you can find your problem using your meters diode check. They almost always fail shorted rather than open. The freq drives usually show the diode configuration on the panel cover.
Just learn basic high-voltage precautions before starting work!
AN FR-A700 INVERTER HAS DEVELOPED A PROBLEM OF ONLY RUNNING IN ONE DIRECTION(FORWARD) BUT PREVIOUSLY IT WAS RUNNING IN BOTH DIRECTIONS AND I HAVE CHECKED THAT THERE IS NO SIGNAL FROM THE INVERTER(AT RUN TERMINAL) GOING TO THE PLC .WHAT CAN BE THE PROBLEM.QUICK RESPONSE WILL BE HIGHLY APPRECIATED
helo sir , i had a question 90 kw motor is controlled by danfoss vtl 6000 drive . when ever i check load of motor it is not constant some times it show 10amps and some time 50 amps. it showing variable load what should i do please help..
What is your application?
It is used as exhaust fan
Test on another smaller motor. If it still shows the motor current incorrectly replace the current transducers. If problem persists replace the control card, Danfoss no longer support the VLT 5000 and 6000 I believe so you will have to source a second hand card..
I would also check the ribbon cables between the PCB's for continuity and the headers on the PCB's for corrosion.
Dear sir
May be some reasons for this type of problems.
(1) check the motor winding resistance should be equal and in Ohms.
(2) motor terminal connection should be not loose connection (u, v, W) .
(3) may be possible Vfd CT have problems, need too replace or repair.
(4) earthing should be proper between drive &exaust fan.
(5) exaust fan should be not jam.
Mob :8447550303
The mergency stop signal🤔???
How to loading cell?
Please give me a Solution, Do you know how to fix ac drive problem, UVW unbalance output Voltage?
U-V Voltage 7% less, compared to U-W & V-W Voltage
Great video sir. Can you do a video on Siemens VFD drives? I have been running into issues on theses. Thank you
thanx ..sir ...............
Why is this controller solarge for a 350hp motor, in the mean time , the controller for the Tesla Model s motor is tiny and light weight compare to this?
Dc..... tesla
Ac...... this motor. Big difference.
My VCU john zink turn off and gives me a code vfd 101 communication failure
How to trouble shoot cfw-11 vsd
Sir , for a 60Hz rated motor ,how much we can increase the frequncy ...? Plz help
Depends on whole setup. When frequency increases, torque decreases until to point that the motor stalls. You're "lucky" if it still runs at 90Hz. But then, motorload should be probably zero.
Stefan Haesen yeah I didn’t think it would run that high?
I was kinda scared when you started touching the power cables. I could hear a buzzing so was thinking it was powered up
The stir fan alone on that drive would have been 120db, if it were on it would have been obvious.
@@richardcollins5931 I should have said live instead of powered up
@@richardcollins5931 or hot as you yanks say
👍👍
❤
I put a dimmer switch on my ceiling fan. Po mans vfd
That will result in extra heating, and the fan is running slowly so reduced cooling. At least keep an eye on it...
5:09
What is a fault overload?
When the motor is drawing more current than what the motor name plate is rated for.
What is a current overload?
Not load power pault
HOW TO TROUBLESHOOT COUNT OLAF
Bruh I came here from a series of unfortunate events 😂
Hello Red River Electricians
Who knew Donald trump was this good at troubleshooting VFDs
Hello
R= L1
S= L2
T= L3
N= Negative for DC Bus
P= Positive for DC Bus
P= ?
U= T1
V= T2
W= T3
Would someone please explain to me what the second P stands for because Craig didn’t go over it. I would greatly appreciate it.
Well this is 5 months late and you know the answer by now.. but for the record this is typically the 'P+' connection where a DC Link Choke would go. So the choke itself is what would bridge the P and P+ terminals in order to close the loop to the DC bus. If the choke is not present, a jumper needs to be there in order for the DC bus to charge.
I know Donald Trump's uncle was a physicist and all that but I didn't expect to see the Don giving a VFD troubleshooting overview for a random vid like this lol.
F70800???
Great video. Thanks a lot. This man looks a little like Ex. Prez Trump haha
Cc
😐
Lol wut
I need a professional lol
Thanks Mr Donald Trump
Great info
VFD is not giving any output voltage. It seems that everything is OK with the wiring and the program but still I cannot get any output voltage. What can be the reason for this?
If the RUN light blinks then there is no Speed Reference.
Thank you for your response. I've adjusted speed and other parameters but still I cannot get any output voltage.
Did you set your maximum speed to 60 or 50Hz? Did you set your run speed? Have you metered the input terminals to see if there are voltage on the inputs?
there's voltage in input terminals. Also the the parameters are adjusted as they should be but still no output voltage.
What lights are on when it is running? Any error codes?