atebit Posted April 4, 2021 Report Share Posted April 4, 2021 I recently purchased the DCS374B bandsaw to use along with the SWAG Portaband table to use it as a small table mounted bandsaw. It’s not so bad using it one handed (using one hand to keep the trigger depressed) but I thought if I could rig up a foot switch between the battery and the saw, that would be even better. I thought this would be a straightforward task (just put the foot switch in-line with B+ and B-) but not so fast, says Dewalt. The battery well on the saw only has 4 prongs: B+, B-, C3 and TH. So I send all four of the lines from a battery connected to a battery well I harvested from an old tool, through a 4-pole relay to a 20V Max battery shell connected to the bandsaw. The battery also powers the relay coil, so hitting the foot switch causes the relay’s normally open contacts to close. When I hit the foot switch and depress the trigger, the saw actually runs for 1-2 seconds, then stops, and the LED dims out right away. This makes me think that the saw is detecting a condition it doesn’t like and therefore shuts itself down right away. But since I’m passing all four lines straight from a Dewalt battery to the same prongs on the saw, I don’t understand how the saw knows the difference. The saw runs fine with a battery attached to the saw’s battery well, so I know that the saw is otherwise working correctly. Anyone have any ideas? Quote Link to comment Share on other sites More sharing options...
RDC Posted April 6, 2021 Report Share Posted April 6, 2021 Are you using a right heavy gauge wire for the B+ and B- connections? Can the Relay handle the current? Triple checked everything is going to the right places? Try powering the Relay externally for a test. Quote Link to comment Share on other sites More sharing options...
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