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TFB Motor confusion 220/440

devin_decater

Plastic
Joined
Feb 20, 2014
Location
California Central Coast
Okay, I’ve read several threads here stating the Hardinge dual speed motors cannot feasibly be rewired for high or low voltage like a normal induction 3 phase motor. Here is my confusion - this TFB was running on a transformer in the shop it came from, stepping the shop’s 220 3 phase to 440 for the machine. The coolant pump and vari-drive motors were both wired 440, and legend has it the machine ran fine for years. However the drive motor has a 220V data plate on it. So I reconfigured the coolant pump and the speed change motors for 220, they each run fine, but the spindle motor starts like a 440 motor running on 220. So am I just the unluckiest guy on the forum who found a original Hardinge 220 motor that was re-wound for 440? The motor is a 1HP Westinghouse lifeline-A multispeed motor Model “A UDP”.

The stator connections wiring plate does show a bunch of terminal wires that do not exist in the main junction box. Is it possible they hid those other connections deeper inside the motor? In the terminal box I have only 6 wires: T1, T2, T3, T11, T12, T13

All six go straight to the big drum switch in the electrical box. None are linked or combined like I would normally expect to see in a motor box.

The machine has an omniturn attachment on it, so I have the option of just replacing the motor and vari-drive setup with a vfd, but I would rather just leave the original motor as it is if feasible.
 








 
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