Motor Running High Amps 1

[matgal1]

Can any one help. I have removed an old motor due to bearing failure and have replaced with a new Leroy Lomer motor. The problem I am having is that when the motor is coupled up the overload is tripping. FLC of motor is 14.5A at 415V, the motor is running at 16.5A(on load) and the motor running light is 9A. I believe that the running of the motor light is a high figure,so I replaced the motor with another Leroy Somer and again the same figures were achieved, on load and run light.

After these probelms the pump has been changed, overload replaced, and numerous tests have been carried out, but everything checks out ok.

Has anyone any suggestions?

 

[Ahr35181]

JB,

Quote "Suggestion: Sometimes, a motor is somewhat damaged by higher motor shaft load. Motor stator interturn shorts may develop due to somewhat higher shaft load".

Would the higher motor shaft load cause instantaneous stator interturn damage to the two new motors?????.....I THINK NOT?????

Alan

 

[jbartos]

Suggestion to the previous posting: It somewhat depends on the motor protection, e.g. thermal relay element sizes, characteristics, circuit breaker sizes, etc. Certain types of pumps are pumping debris that can cause the shaft load transients.