HOW TO TEST AN OVERLOAD RELAY 

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Thank you for the feedback. Any motor being controlled it is recommended to use an overload for protection. If your motor is overheating it is probably overworked ( having too big of a load). While this overload will protect you from over current which is a common factor for overheating, you might want to upsize you motor to match the load it is connected to.

@@synectum640 Thanks for your fast reply. It's not that I'm having a problem with overheating but I want to prevent any potential overheating problems. I have assembled a diy meat grinder and only use it for meat but I want to grind bones as well. I've only recently learned about overload protection and want to protect the motor in the event that it gets stuck on a hard bone. If It's not a problem for you can you recommend a suitable overload relay for my current set up? The motor is 2.2KW 220V.

What is the FLA on the nameplate of the motor? Should be around 10 -13 amps.

Eaton XT series electronic overload relay, 4-20 A adjustable. Model type XTOE020CCSS.

The motor says 2.2 kw 220v and 7.5 A All of the words are in Chinese so I'm not sure if the FLA is 7.5 A. As for implementing overload protection this might be a dumb question but how do the connections go? Will it just be as simple as running the power source for the motor to L1 and L2 and then connecting T1 and T2 to the motor?

That is correct.

@@synectum640 thanks sir!

Thank you. It's called microflex onyx. Many different suppliers for them online.

First off for any thermal overload malfunction I would advise you to check the wiring first. Ensure your NC contact is wired in properly to break the circuit in a tripped state. Another failure point is the thermal bi metallic strip. Based on your question however in order to properly set and size the adjustable class 10 overload you must first get your FLA rating from your motor nameplate and use your 125% x FLA if you have a SF of 1.15 to get your max load current. With those values you can properly determine if your overload should have tripped based on your calculations. If possible state the voltage level, FLA, SF, and also the model overload you are using so we can carefully diagnose. Thank you.

Yes it initiates a tripped condition.

@@synectum640 thanks

Seems you might have a tripped OL. Remove power from circuit, reset and test for continuity. If you do, check circuit for a potential short.

I belive you have a controls issue. You on/off or start/stop seems to be not working and hence keeping your contactor closed. I would start there and work my way down. Thank you.

Yes that is correct. 95 - 95 would be wired in series with coil wiring of the contactor supplying the 3phase power. When it trips it opens the coil circuit, deenergizes the contactor and opens the line to load contacts which prevents current from flowing to the overload terminals IDEALLY.

​@@synectum640 Thank you for the confirmation and for the great video!

You're welcome and thanks for the feedback.

Good day. It is used to manually open the N/C contact on the overload.

You usually only wire your hot going through your NC contact so it depends on where your reference is that determines the voltage read at your NC contact. If your measuring across the NC and NO contacts then yes. The coil if it is a magnetic or electronic will also affect these readings for your NC contacts.

The most you can do are the test outlined in the video. Only additional test is to actually supply the overloaded current to see if it trips (I WOULD NOT ADVISE THIS).

Good day. For an overload there should always be continuity between ( L1 - T1) , ( L2- T2) and (L3 - T3) in a normal operating overload device. In my example we experienced "OL" conditions between our first two line to load contact legs hence why that overload was a damaged one. NOTE : It's different from a contactor where you'd usually have an OL condition between your line and load terminals until the coil is energized.

@@synectum640 Thank you and I now got it. :)

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Yes, it is. From my scrap pile.

@@synectum640 ok, Sir. Any possibility of opening it and try for repair?

For reliability issues I wouldn't. Being such an important safety device, I would replace.

​@@synectum640Right, Sir. 😊

If you're asking if I am Walter, then no.