I am wiring a Mattison 202 straight line rip in a new shop. The serial number, 200XX indicates late 1950s manufacture. The saw data plate indicates 220/440 volts. I need guidance on how to tell what voltage the saw is currently set up at and how to convert to 220V if it's not already
Normally on the motor plate or under the wiring cover on the motor there will be a diagram on how to wire the motor(s) to the high or low voltage. Then you need to look at the starters. If it is that old they could have been changed out. Older starters have heaters. They are little coils on each leg of the starter held on with two screws. The heater will trip the starter if too much amperage is drawn on any one leg protecting the motor and wiring. So there are two different potential heaters, one for high voltage one for low.
I would pull the motor wiring covers, see what it is wired for, Pull the heaters see what size they are and call a good electrical supply house to see what amperage they support. From that you should be able to tell what the machine is set up for now and be able to tell if you need to switch the wiring and get new heaters or not.
On a machine that old you might want to have an electrician look at it. The wiring insulation deteriorates over time. It may need to be rewired. I have done that old old machines and it is not as bad as it seems.
If you don't have a good electrical supply house reach out to me I have a good one that deals with old stuff and sells old used parts.
Just curious, what do you want to do with the saw rip molding blanks?
Thanks Bill. This will be our straight edger before the boards go to a band rip for molding and flooring blanks. I've done a lot of electrical work over the years, but never dealing with larger motors. I didn't realize that the starters may have heaters. That gives me a starting point.
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