Wiring a chinese tool presetter.

The instructions include a limitation on not more than 20mA current. Wouldn't shorting 24VDC directly though this switch to a 7i77 input pin exceed that current limit?

Digital inputs are high impedance. They have to be ur nothing could ever change their voltage level.

If you want to be sure, use a multimeter in current mode to connect an input to +24V. You should see a state-change in the input and a few mA of current.

Thanks for that desciption.

Just for the record, my tool is using a KAQY214S solid state mosfet inside. Now you can look up the detailed specs yourself, it's easy to disassemble the entire unit, there's not much technology inside





I think 2 components which look like a capacitor are just Fuses / PTC fuses maybe.

This is the schematic on Amazon.

It has two switches. One is NO the other is NC.

The schematic that came with the setter is the same but a bit more descriptive concerning the contacts.

60v DC 100ma / 60v AC 100ma- 500mw max

Dont look at it to long.......