Hello All,
I've got two machines powered through phase-o-matic static phase converts and both pull 75%FLA unloaded (idle); ones a 3hp (mill) the other is a 7.5hp(lathe) motor. I pulled the 3hp motor out of the mill and replaced the bearings and carefully removed the old grease; i haven't torn into the 7.5hp motor. The 3hp still pulls 6amps or more (8fla) unloaded and out of the machine; it could be the original Allis-Chalmers motor from the 50s. I would expect 4/4.5 amps unloaded, but not 6+; no shorts in the winding to the case. Could this be a byproduct of running off 2-legs or running through a static phase converter or could it more likely be junk motors? There's a shop in town where I can have them tested, but I thought I would ask the community before I went that route.
Thank you!
Pinck
I've got two machines powered through phase-o-matic static phase converts and both pull 75%FLA unloaded (idle); ones a 3hp (mill) the other is a 7.5hp(lathe) motor. I pulled the 3hp motor out of the mill and replaced the bearings and carefully removed the old grease; i haven't torn into the 7.5hp motor. The 3hp still pulls 6amps or more (8fla) unloaded and out of the machine; it could be the original Allis-Chalmers motor from the 50s. I would expect 4/4.5 amps unloaded, but not 6+; no shorts in the winding to the case. Could this be a byproduct of running off 2-legs or running through a static phase converter or could it more likely be junk motors? There's a shop in town where I can have them tested, but I thought I would ask the community before I went that route.
Thank you!
Pinck