Motor Overload

Ok been there..done that...now ,...

a) Check rpm of motor it could be double than the pump design rpm.

b) Can you interchange just the motor of the two pumps and then check the results, if the problem persists then it is the pump problem.

Do post your results.

Cheers.

Your motor is harder than it should. Check to see if you have a plugged system (i.e., clogged filter??), also, check to be sure you have all you valves open like it should. One more thing, is there any bearing associated with the pump?? You would have a bad bearing which cause the motor to work harder, too. Please let us know your finding.

MidniteFigther

I did replace the bearing although I did take pulse shock for bearing which okay

8 amp with no load accepted ?if not what should the motor amp reading

Without knowing the size of you motor (hp??), I know know if 8 amps is high or not, but if your FLA is 24, then 8 amps seem to be a bit high for no load. Take a look at your motor's name plate data, it will tell you more infomation then I can. You mention you have two motor that is identical and do the same function, can you check the other motor and compared it to the problem one?? i.e., no load amps?? What is the reason you change the bearing?? Was it worn?? How about the housing?? Is it clean?? Warpped?? Sometime a new bearing won't help if the housing is warp, and not lined up.

MidniteFigther

3. It might be going backwards (been there, done that, etc. ).

I thought of that but dismissed it, maybe too quickly. Would the OL be that high? Usually you get less flow, meaning less motor loading, but just not the desired outcome.

But then, that would again depend on the pump design wouldn't it?

The problem is most likely with your water pump if it a new installation check the rpm of the motor to the rated rpm of the water pump. If the motor behaves normally with no load and all 3 phases tong the same this also points to the water pump.THe electric motor will pull as many amps as it can to get to its rated RPM eg no load not a lot of amps needed water pump clogged bearing seized etc motor pull as many amps as it can to get to rated speed

First motor rating in KW and RPM is essential.Normally on low speed motors no load currents will be high like a 6P machine will have a higher no load amps than 4P.Normally it varies from 20 to 60% high end being on 8P etc.so this information is required.I hope you have the manufacturers test certificates which will give the value at the time of testing and a comparison can easily reveal the problem.Everyone should ensure that when electrical equipment is purchase all documents like type , routine test certificates are collected and also maintenance check records are maintained.Thse will be helpful.

"Everyone should ensure that when electrical equipment is purchase(d) all documents like type , routine test certificates are collected and also maintenance check records are maintained."

If only the world worked like that...

'Took me a while to understand the question. There's not even one punctuation in the question, not even at the end.

I must be on a slow day today, decoding rcapper's code drained me.

This question's answered as far as I can tell. I'm just typing...don't mind me.

If it is a centrifugal pump, are the 2 motors running in the same direction?

It sounds creasy, but a mechanic man told me the following story; they bought a pump which was much too big for the motor, so to decrease the needed motor torque, they let the pump run in the opposite direction. The efficiency of the pump blades is then less, and the motor needs less power…

Your question is not clear but it seems you are saying the motor trips the circuit breaker at 24 amps of load.

It is not clear, at least to me, what the run load of that motor should be nor the rated load bearing capacity of its breaker.

Nonetheless, one thing I note has not been suggested, and which I have come across many times in industrial situations, is that breakers sometimes become derated, i.e., they tend to trip at lower loads then rated.

j.

The original poster has not to my mind taken the time to place a correct, understandable question on CR4.

I for one have little idea of the requirements of the two motors.....

More precise infos please. Make short simple statements, check each for validity, then maybe we can help.