Thermal Protection. ANSI 49 with Sepam relays

[radug]

Hello,

I am trying to define protection settings of a Sepam relay for thermal overload protection of an AC motor, ansi 49 function. This relay has 2 curves, cold and hot.

I have the relay manual and do not understand exactly how to define proper settings from ac motor datasheets (sometimes I have cold and hot time constants and with other motors I have the curves).

I have contacted the relay manufacturer (in Spain) and it has been of no help.

I have also read the IEEE AC Motor Protection Standard but still, I do not understand exactly what this relay does and how to select proper settings.

Anyone has experience dealing with this relay?


Thanks.