Heaters for 10hp motor keep tripping
Heaters for 10hp motor keep tripping
(OP)
The starter relay for a 3 phase 230v/23.4FLA /10 hp motor continues to trip.The heaters are type W61.The starter relay is a Allen-Bradley model 509 COA. The heaters trip while under load and with the load uncoupled. What could bring about this condition ?





RE: Heaters for 10hp motor keep tripping
If the motor amps are OK and heaters are sized correctly, check for loose connection or other heat source around the overload relay in the starter.
Are you sure it is the overload relay tripping and not the breaker?
If tripping continues and no cause can be found, replace the overload relay.
David Castor
www.cvoes.com
RE: Heaters for 10hp motor keep tripping
RE: Heaters for 10hp motor keep tripping
David Castor
www.cvoes.com
RE: Heaters for 10hp motor keep tripping
"If I had eight hours to chop down a tree, I'd spend six sharpening my axe." -- Abraham Lincoln
For the best use of Eng-Tips, please click here -> FAQ731-376: Eng-Tips.com Forum Policies
RE: Heaters for 10hp motor keep tripping
RE: Heaters for 10hp motor keep tripping
"If I had eight hours to chop down a tree, I'd spend six sharpening my axe." -- Abraham Lincoln
For the best use of Eng-Tips, please click here -> FAQ731-376: Eng-Tips.com Forum Policies
RE: Heaters for 10hp motor keep tripping
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Heaters for 10hp motor keep tripping
Change the overload block and the heaters.
If you are a jobber or an independent, and this is prohibitively expensive, then jumper the NO on the OL blockjust long enough to see if it will run.
The OL relays do sometimes wear out, especially if you have production workers who know how to reset and rerun.
RE: Heaters for 10hp motor keep tripping
Sincerely,
lectricwes
RE: Heaters for 10hp motor keep tripping
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Heaters for 10hp motor keep tripping
That was true with the old "N type" heater elements, but when they (A-B) went to the W type they moved the solder pot onto the element so that you are replacing it when you replace the element.
lectricwes,
I'd be careful about suggesting that anyone "jumper out" a protective element like that. I assume you meant it to be a temporary situation of course, but a lot of people read things like that and take it to mean it must not be a big deal. it is.
"If I had eight hours to chop down a tree, I'd spend six sharpening my axe." -- Abraham Lincoln
For the best use of Eng-Tips, please click here -> FAQ731-376: Eng-Tips.com Forum Policies
RE: Heaters for 10hp motor keep tripping
Yours
Bill
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Heaters for 10hp motor keep tripping
I should have added that jumping motor overloads is never a fix, and should be used only as a troubleshooting tool.