millermatic 252 RUN function??? what is it good for?

[jamesmg]

normally 20volts works good with 1/4 " carbon but change the RUN setting and it can run too hot or too cold. ( hold trigger when turning on this machine,then let go. you will see what i mean!) Functions might be there to help but every time there is a new function i come acrossed i am confussed. mig machines without this can run a open root with 18 volts downhill!

[aametalmaster]

My MM252 at work changes V and wire speeds on its own. Can run all day then something doesn't seem right and then yup it changed. Somedays its real hot and other days its cold...Bob

[elvis]

Are you talking about run in speed? My 251 has that. It adjust how long after you pull the trigger that the wire starts feeding. I think I have mine set around 80% if I remember right. PO had it are around 60% just personal preference.