Reply by MrUnix

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Posted on 1950's Powermatic 60 8" Joiner - Electrical Question

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8281 posts in 3115 days

#1 posted 02-09-2017 01:10 AM

According to the manual, there were three options for that jointer.. a straight manual on/off switch, a NEMA starter with remote control station, and a NEMA starter with a low voltage remote control station. The manual switch was most likely used for single phase control of a motor that had built in thermal protection. The other two would have used a momentary push button (NO Start/NC stop) in conjunction with a NEMA starter box hanging off the machine somewhere.

If you want to go back to original, you would need the NEMA starter, with heaters sized appropriately for your motor load, and the momentary push button control station (three wire control). The choice of using LVC would depend on what starter you get and it’s contactor control voltage requirement.

A better option IMO would be to use the existing IEC starter and just wire it for three wire control. You could mount it inside the cabinet along with your SPC and use the existing outlet box in the cabinet to mount the control station. If you provide more info about the IEC starter, and perhaps a better close up picture, I’m sure it wouldn’t be too difficult to figure out what wire goes where.


PS: If it were mine, I’d just get another VFD for it and rip out all that PO installed stuff… they are now as cheap or cheaper than a SPC, and the SPC will reduce your motors horsepower by about 30%, dropping it down to about 1hp (and provides unbalanced phases to the motor, causing it to run a bit hotter).

-- Brad in FL - In Dog I trust... everything else is questionable

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