I am not saying that the motor is getting overloaded when run uncoupled, I just believe that the figure of 9 amps is to high for a uncoupled motor and that when a load is connected, it just compounds the high starting reference, to cause the overload to activate. The motor is connected is delta...
I suspected a motor problem, due to the high uncoupled reading of 9 amps. But after changing the motor, like for like I recorded the same readings on the new motor. I can't have a alignment problem due to the equipment being laser aligned.
My main concern is the 9 amps uncoupled reading, why...
The Leroy Somer motor details are as follows:
serial no.64601,AC,1450rpm,7.5KW,14.3FLA,415v,ExN.
And the previous motor was a Brook Crompton and details are:
serial no.B662597,AC,1450rpm,7.5KW,14.6FLA,415v,ExN.
As you can see the specifications they are very similiar, as these were specified...
The FLC of the motor is 14.5A. The original motor was a Brook Hansen motor and it was a like for like change. I still have Brook motors next to the new Leroy Somer doing the same task.
But they give completely different amp readings when run light, in the region of 3.4A for the Brook Hasen.
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...
