Boxford TCL125. (Fresh start )

[John11668]

Another lesson this evening!
I decided to take a supply to the driver board from my 5 v PSU rather than regularly falling over a Usb lead from the computer.
And I took the opportunity to make some of the other wiring a bit more compact. So I had the power switched off , and unplugged for (I think) more than 20 mins when the 24 v supply cable touched the chassis giving me a hefty flash and lightly welding itself . Maybe need to be careful of big capacitors .
I think it has taken out the driver board as the traverses dont seem to be working. Spindle controller still OK though .

Is there a way to quietly discharge the capacitor when I switch off??

[Doddy]

Another lesson this evening!
I decided to take a supply to the driver board from my 5 v PSU rather than regularly falling over a Usb lead from the computer.
And I took the opportunity to make some of the other wiring a bit more compact. So I had the power switched off , and unplugged for (I think) more than 20 mins when the 24 v supply cable touched the chassis giving me a hefty flash and lightly welding itself . Maybe need to be careful of big capacitors .
I think it has taken out the driver board as the traverses dont seem to be working. Spindle controller still OK though .

Is there a way to quietly discharge the capacitor when I switch off??

Big capacitors?, I always fit a bleed resistor across the terminals - nothing too exotic - for exactly that reason. Others here will argue against that... we agree to disagree.

[John11668]

Big capacitors?, I always fit a bleed resistor across the terminals - nothing too exotic - for exactly that reason. Others here will argue against that... we agree to disagree.

Not as bad as initially assumed .. Board IS working but amazingly the jog function works better when some "plonker " does not forget to check that the "Jog on" function is selected Dooohhhhh!

Nonetheless I do feel it would be a good idea to bleed away charge from the capacitor when the the supply is broken . What size of resistor would be approprate ??