I have a new neighbor who is having a problem with his 4224B. He recently ran his lathe at a very slow speed for about 3 hours. He shut the lathe down and it would not restart. The inverter showed a code which suggested a reset. He did that but it will still not restart. Any suggestions would be welcome.
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Powermatic question
- Thread starter Finn Posner
- Start date
Low speed can create over-temp. conditions.
When some lathes go off on over-temp. switch, cutting power, one needs to unplug the lathe cord, wait at least 15 sec., (I wait a minute) and plug back in. This resets the lathe controls on some lathes.
Worth a try.
When some lathes go off on over-temp. switch, cutting power, one needs to unplug the lathe cord, wait at least 15 sec., (I wait a minute) and plug back in. This resets the lathe controls on some lathes.
Worth a try.
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I suspect that it's not the inverter, but the motor that overheated and tripped a thermal breaker. Some motor thermal breakers automatically reset, but it could take a few hours. Others that have a button on the motor require manual resetting. Check to see if there is a button on the motor and if so press it.
Here is an example picture from an air compressor showing the reset button (not always red).
Here is an example picture from an air compressor showing the reset button (not always red).
With the old 3520A model, the speed went down to almost zero before the lathe would shut off. With the B model, they went up to 50 rpm before it shut off. I was told by the tech, who was obviously reading from a manual and had no real experience with the lathe, that the motor would over heat and I would fry the electronics. I told him that I had sanded out thousands of bowls at those speeds and it never happened. When I got my Robust AB, they had the same shut off at 50 rpm. I had Brent walk me through ramping the minimum speed way down. He was also concerned about the over heating. I checked the motor often with my hand. The motor actually ran cooler than when I turn. Guessing it is because I make the lathe work hard when I turn. With the slow speeds, the motor is idling, so there is little to no heat build up. Maybe if outside temps were really hot. I would not expect over heating to be an issue here. This type of slow speed is used for sanding and some times for thick finishes that you don't want to drip. It is not used for working. If I was hand sanding, I would have the rpm up to max about 500. With my warped bowls, I can't keep the drill on the wood at speeds over about 15 rpm.
robo hippy
robo hippy