Whats a quick way to check a motor's thermals?
Whats a quick way to check a motor's thermals?
(OP)
Most thermals go to the holding coil on the starters. Is there any other way to wire these up?
Can you check a motor's thermals or is there a test one can do before you actually put them into service?
Please keep it simple electrical components are not my field of expertise - Thanks
Can you check a motor's thermals or is there a test one can do before you actually put them into service?
Please keep it simple electrical components are not my field of expertise - Thanks
Wayne E. Lovison
service-parts@naglepumps.com






RE: Whats a quick way to check a motor's thermals?
RE: Whats a quick way to check a motor's thermals?
Thanks for the input. But replace with thermal OL or device
what does it look like? How does it function different from the arrangement?
Where do I get the proper rating to check against? What type of values should I get or they report they are getting?
Are we talking large values or low ones?
Wayne E. Lovison
service-parts@naglepumps.com
RE: Whats a quick way to check a motor's thermals?
Tests before putting the thermal oveload relay into service would include passing current through the relay, using a test set that can provide variable curent and includes a timer to check the operating time to trip - see www.avointl.com, they (along with others) manufacture this type of test set.
RE: Whats a quick way to check a motor's thermals?
I appreciate what you're saying. I wouldn't actually being doing this test. I want to tell others what data I would need so as to establish whether or not it really is working.
So far I've found out that there is a procedure for checking this all I want to do now is make sure someone in the field takes the data and reports back their findings. Then I can go back to the motor supplier and ask them if these values are inline with what they are getting.
Thanks for the input
Wayne E. Lovison
service-parts@naglepumps.com
RE: Whats a quick way to check a motor's thermals?
My previous post reflects how to troubleshoot a thermal overload moreso than to verify its operation. Hope this helps.
RE: Whats a quick way to check a motor's thermals?
Once again you came through. Thanks. Don't worry I have no intentions of messing with these test. But I needed to know what questions to ask and what results to look for.
The plant must have the newer state of the art overload relays you're talking about but we've lost five motors in 60 day to 90 days increments of which can only be caused by overloading.
This overloading should have tripped out the motors long before they got to the roasted stage. We need to find out how they have them wired up and why we're not blowing out the thermals.
I'm printing this data out and thanks again. I can always appreciate someone who knows their trade and can back it up. Thanks again.
Wayne E. Lovison
service-parts@naglepumps.com
RE: Whats a quick way to check a motor's thermals?
This is why I recommend the electronic overload because you can troubleshoot the cause of the overload better. High and low voltages result in an overload condition- this is the only damaging affects of UV and OV (assuming motor is running). People are often surprised when they first install these. The units trip on some condition and they immediately assume the electronic unit is bad. Usually, this is not the case. These devices often shed light on a problem that has been around since the motor was installed. Some will even tell you the time and date of the fault so you can track the origin of the fault. For example, at 9:00 am every morning this electronic relay trips on a low voltage condition. Well this MAY indicate that some large piece of machinery is being started at this time and browning out the power supply of everyone on this same substation. This is just one example.
Thanks for the praise. Buzzp
RE: Whats a quick way to check a motor's thermals?
As far as checking the ‘thermals,’ there are specific test sets to do that, like www.phenixtech.com/portablehigh.html
RE: Whats a quick way to check a motor's thermals?
RE: Whats a quick way to check a motor's thermals?
I think I'll pass the wrench attempt. Though it has its merits.
Wayne
Wayne E. Lovison
service-parts@naglepumps.com
RE: Whats a quick way to check a motor's thermals?
RE: Whats a quick way to check a motor's thermals?
Low voltage, High Voltage, Voltage Unbalance, Reverse Phasing, Single Phasing, Overcurrent, Undercurrent, and Current Unbalance.
If you can not spend this much, then just look for voltage monitoring on the main power supply as a start to verify voltage is not a problem. Or just start with one on a couple of motors. There are electronic overloads for medium voltage applications but often require PT's (step down voltage to 120) to monitor the voltage.