Seig C3 CNC spindle problem

[Chaz]

There might be a main power fuse blown that feeds the spindle (as well as a fuse in line near the spindle's drive). Are you getting power to the spindle drive?

[Leadhead]

Chaz - No just getting the normal audible click on and click off. This is the model with the separate 12v power supply at the back of the column. Having my sparkbuddy check it out in the morning.

[john swift]

have you asked Ketan @arc eurtrade

Photos of the speed control board and CNC interface will be useful

my mini lathe for example has a seig FC250 PWM speed control board with 2 FET's as the control devices
the board has has two relays that form a no-volt release and interlock that forces you to start at minimum speed

later machines have a XMT2325 speed control that uses two thyristors as the control devices that are part of a controlled bridge rectifier

once the various boards have been identified it will be easier to fault find

John

[Leadhead]

John - Thanks for help. I will take some photo`s this morning,

Rod

[Leadhead]

John - Here is photo of board. The two blue wires next to the central small white box are the ones I shorted. The card is marked SEIG MACHINE zz0070201A

[john swift]

I have not found an exact match but this PDF wiring diagram for a
110V mini lathe gives you a basic wiring diagram
PDF diagram


for the CNC conversion
the speed control potentiometer that is normally connected to terminals p1 to p3 has been replaced by
a DC control voltage connected to p1 & p2



without the circuit diagram of the speed control board
I can not guess what the blue wires are connected to and
what possible damage to the board could of happened to the board



if the under side of the PCB looks OK with no blown tracks
it will be possible to bench test the board using a 100W bulb as a dummy load in place of the motor and a potentiometer connected to P1 to P3
NOTE - all the board & the wiring to the potentiometer will be live !!!

repairing my CL300m lathes speed control board
https://www.model-engineer.co.uk/for...p?th=38809&p=1

John

PS
found it
the board is a XMT-2360

[Leadhead]

John - Thanks, the board is XMT 2360. The two blue wires are connected to the green chuck guard switch you have indicated. There are currently 3.6V across the terminals.