Help please. Dip switches and mach 3 settings

[john swift]

does it still make a noise if you remover the jumper to disable the relay ?
(I can't think of anything other than the relay that could make a noise)

having a quick look at the data sheet for the LM317 regulator
the 12 to 24V DC supply needs to be a minimum of 13.5V

the supply goes via a diode that drops about 0.6V and the LM317 regulator should have an input that's at least 3V more than the 10V output

is the 12V supply regulated ? or is it unregulated and is more than 12V if lightly loaded

for your initial tests you can disconnect the connection to the stepper driver enable

John


PS

a simple input tester I used to test a similar BOB without using a PC (or motion controller)

[Radu_Andrei]

the supply is a 12v transformer, which used to power up some car led.s strips. the multimeter reads 12.1 v. it is the one i use for the enclosure fans.
as i fiddled with the wires, somehow it works now. probably a bad connection from the 12v supply. so Thank you!

I looked a bit online, and the eccomerce webs in my country have plenty of 12v, but no 24 supply. Surely there might be some specialized shops somewhere.

It works like this now. Do I ask for trouble if I don.t use a higher supply, 13.5v and above?

Now on the other side of the bob, for spindle control via mach 3, from what I understand, the gnd pin goes to ACM, the 0-10v to V1, 1st relay pin (5th in order) to DCM, and 2nd relay pin to FOR.

Is this correct?

[john swift]

great to see you have it working even if your not 100% sure which connection you re-made during your investigation

your connection to the VFD looks correct

in practice using the 12V supply probably will work

while the LM317's data sheet gives the minimum supply voltage as V out +3V this will be the worse case accounting for the production spread in the IC's parameters

even if the supply is too low for the regulator to regulate the output as intended

the fact you have a regulated 12V supply
the voltage is likely to be near to 10V and not change too much and
cause the calibration of analogue control voltage to the VFD to vary

John

[Radu_Andrei]

I have another identical supply, so wiring it in series might give me 24v, or 20 due to what you said. I might have a spare laptop charger somewhere, which is 17 or 19v.
If it is a requirement, I.ll do it.
Thanks again for the detailed answer. :)

[cropwell]

I have another identical supply, so wiring it in series might give me 24v, or 20 due to what you said. I might have a spare laptop charger somewhere, which is 17 or 19v.
If it is a requirement, I.ll do it.
Thanks again for the detailed answer. :)

Leave it alone at 12v - if it ain't broke, don't fix it. If you get 0 - 10v on the analogue output, you'll be fine.

[Radu_Andrei]

Ok. Thank you. And yes, the 5v usb cable is run from the pc. I have a phone charger available as well. It reads 4.74v at pc5v and pcgnd.
Does it matter?

[john swift]

phone chargers are not regulated very well
so you will be better off either using the PC's USB port or using a regulated 5V power supply to power the 5V side of the breakout board

John

[cropwell]

PS

a simple input tester I used to test a similar BOB without using a PC (or motion controller)

I made a pass-thru tester years ago when I was trying to work out what was happening with a printer/plotter I had. Exactly the same as that but with lower value resistors but each LED was powered by the printer or PC.