Replacement of an old Motor Protection Relay with a new Multilin 369

[jucesanc]

I'm replacing a Lodtrak III with a Multilin 369. The motor is a siemens, 250 HP, 4kV, 33.4 FLA, 1800 RPM motor.

Someone else is programming the multilin, and they are requesting the thermal damage curves. I'm thinking this would be included in the time vs. FLA curve. However, none of the electrical curves for the existing motor are available. What information are they looking for and would I be able to find it somewhere else?

Unfortunately, the client hasn't kept good records. There are plenty of files for the pump, but very limited for the motor. I have: the single line, elevation drawing, existing wiring diagram, motor instruction manual, motor outline drawing, and motor datasheet.

 

[Jraef]

From my experiences with Siemens motors, you will waste countless hours trying to get it from them and eventually be forced to give up anyway. If it's a relatively "normal" motor, meaning it's not a weird IEC motor or anything custom, they can just use a standard NEMA Class 20 Overload Curve. If it is an IEC motor, or a centrifugal pump that cannot be overloaded anyway, you might just opt for a Class 10 curve.

Do you realize that the 369 is slated for obsolescence now? If that's what they have and are used to, I get it and that's fine. But if they are calling for that because they think that's "state of the art" in MPRs, they are going to be sorry in a couple of years when ABB announces they are dumping it in favor of whatever ABBs new version will be...

 

[jucesanc]

From my experiences with Siemens motors, you will waste countless hours trying to get it from them and eventually be forced to give up anyway. If it's a relatively "normal" motor, meaning it's not a weird IEC motor or anything custom, they can just use a standard NEMA Class 20 Overload Curve. If it is an IEC motor, or a centrifugal pump that cannot be overloaded anyway, you might just opt for a Class 10 curve.

Do you realize that the 369 is slated for obsolescence now? If that's what they have and are used to, I get it and that's fine. But if they are calling for that because they think that's "state of the art" in MPRs, they are going to be sorry in a couple of years when ABB announces they are dumping it in favor of whatever ABBs new version will be...

I did not realize that the 369 is slated for obsolescence... Yeah, this is what they use. They have a few being used onsite already, and they have two new spares here too.

This is 503US frame size and a NEMA B design. From what I'm seeing online, this is a normal-torque motor. So I'm thinking that the NEMA Class 20 Overload curve will apply.