Troubleshooting 3 phase motors

[@RostyslavDelimarsky]

perfect video, very informative and ... straight to the point. thanks Mike!

[@jakegreene3832]

Big Mike, you're the man. Thank you for this informative video. Your experience shows through the simplicity of your explaination.

[@bigmikeh5827]

Thank you. I enjoy passing the knowledge and experience to others. Stay safe

[@davidknepper812]

Thanks for the info. I’m still learning about 3 phase electric.That helps thanks again.

[@bigmikeh5827]

You can do it!

[@Krispy1011]

Informative video - But, wearing proper PPE & locking out properly - you can do so much testing with the multimeter in the ohms position that you are almost always guaranteed to find an issue inside the contactor starter panel if there is one with just using the ohms position on your multimeter and if no issues found inside the contactor starter panel then the issue is outside at the motor with mechanical bind or mechanical damage or possibly in the motor junction box mounted on the motor etc.

[@kizito8888]

Are you a teacher? I really hope you’re because the way you explain everything is knowledgeable and precise.

[@bigmikeh5827]

I taught industrial maintenance and electricity at TCAT Clarksville, Tn. I sure miss it

[@ScoutCrafter]

Semper Fi Mike! Good to see you...

[@Tootnscoot]

Never just trust and reset. Never ever trust a contact. I had a friend who was working at another factory that trusted a contact and reset it. When he did it blew up and shot a piece of metal into his forehead and the arc burned his outline into a panel door. Killed him instantly at 24 with 2 kids. Your first instinct should never be simply to reset something, it's tried for a reason and that reason is 100% of the time because something somewhere is dangerous

[@RugbyLock]

What the hell was he doing touching anything with that much energy without an arc flash suit and other PPE!

[@Krispy1011]

Not wearing proper PPE and being not into proper safety can result in bad consequences!

[@stevenflores80]

Love the explanation Brutha it’s much appreciated God Bless

[@OneThumbDad]

Great informative video thank you sir

[@edwardtwumasi2904]

you are very good lecture😜

[@coolsheatingacservices7375]

Thanks Mike!!!

[@zay8452]

Hi I’m new to all this but I’m tryna teach myself and I’m currently in a situation so we have 2 3phase motors and 1 keeps shutting off on its own I’ve switched the contactor and the breaker from good motor to bad motor and motor still shutting off and the good motor continues to work without shutting off could this mean the motor is bad then? PLEASE HELP

[@bigmikeh5827]

I would check the motor current with a clamp meter. Should be the same on each leg. Check data play for your motor amps. Compare. Motors overloading happen for two basic reasons. Electrical and mechanical. If motor is working too hard due to bearings going out or something is jammed, or motor has a short to ground or phase to phase.

[@zay8452]

@@bigmikeh5827 thank you for responding appreciate your advice/help

[@bigmikeh5827]

@@zay8452my pleasure. Ask anytime.

[@zay8452]

@ hey how are you doing I have another question so our machine shut off while I was on vacation and the safety relay k2 light won’t turn on I can’t get machine to reset in order for it to turn on it has power just the not able to reset it in order to get the plc boxes on

[@davidtoney8399]

Good video. Thank you.

[@MichaelHoyt-MulticraftTech]

What if you have heaters in the overload instead of bi-metal strips? wouldn't you have to correct the short or problem then replace the heaters?

[@Neil-r8z]

When you say 0 ohms to ground when testing phase to ground, do you actually mean infinity? OPEN circuit?

[@kenliang6946]

I think he mean infinity which means open circuit. You shouldn’t see any resistance on the meter when you doing the test. if you see resistance that means the either the power wire is shorted or the motor itself it’s shorted. To know if it’s the motor or the wire you can disconnect the wire on the motor side and do the ohms test again if on the meter showing you OL that means the wire is good the problem is inside the motor

[@Neil-r8z]

@@kenliang6946 Thanks, that is what I thought.

[@bigmikeh5827]

@@Neil-r8z yes. I misspoke in the vid. Thanks for the catch.

[@michaelhinchey]

I have a locked rotor motor .75 hp 1.45amp that is making sn aweful sound when starting. Its on a motor starter combo. It sounds like it is struggling to start. The contactor is sparking a little. It tripped immediately. When I change the setting in the breaker in the motor starter to D , it holds but makes that weird sound. Everything is brand new. Any idea?

[@michaelhinchey]

Btw 480v 3 phase.

[@bigmikeh5827]

I would separate the motor from what it’s driving. That will separate the mechanical from electrical issues. If still doing I would use clamp meter to see if phase current is balanced. Is the new motor rated for high starting torque?

[@RugbyLock]

He mentioned what I was going to say at around 6:00… But, check voltage out of the contactor as I have seen those go bad on three phase equipment where one phase has a significant drop across the contactor…

[@alro7779]

I didn't know that if your multimeter reads more than 100 ohms it does not sound. Where does that info come from, Sr., if I may ask?

[@bigmikeh5827]

Experience. It will vary between meters as I’ve experienced as low as 80ohms that no tone would be emitted.

[@alro7779]

@@bigmikeh5827 Thank you, Sr.

[@donnellbaxter8050]

Thanks make more videos

[@kevinliang9502]

I always thought the terminal blocks were 5/16" lmao. I don't own a 9/32" socket lol