motor overloads

[GSXR600]

Hi
we have a few recirculating pumps that need to be wired and they are automatically started with aqua stats the motors have three different positions with three different amp. how do I determine the overload size in this scenario?

 

[ptonsparky]

What do the installation instructions say that came with the motors?
Do they have an internal thermal switch? What horsepower? Nameplate information? Each motor has three speeds?

 

[Aleman]

Just set the overloads for the max speed FLA. You want to protect your motor but you also don't want nuisance trips.
If they run at lower speeds often you might want to try to set below FLA. It depends somewhat on the application
but you need to base the setting on the max expected normal current.

 

[kwired]

Hi
we have a few recirculating pumps that need to be wired and they are automatically started with aqua stats the motors have three different positions with three different amp. how do I determine the overload size in this scenario?

Assuming that means it is a three speed motor, you protect it at the rating of the speed used. If you switch speeds during normal operation you will need to switch overload protection when you switch speed. Does the motor happen to have internal overload protection? Single phase multispeed motors often do.