Easiturn3 auto toolchange will not stop rotating!

[Adee]

Hi
I have a Easiturn 3 PNC3, been using it weekly with no major problems.

Last night the Auto toolchanger when selecting tool 7 decided to just continue to rotate until I reset the control, but works fine on the other tool positions.

Any Ideas before I start taking the changer apart?

[cncbasher]

sounds like one of the position sensors , run the diagnostics test and as u rotate it by hand , you should see each switch positon change

[Adee]

How do I go about testing the sensors, the manual is a bit vague?

Adee

[cncbasher]

going by memory here for the pnc3 board ,

switch on , before pressing the zero datum as usual , press the T key (test)
this gives a display on the screen look at the toolchanger , shown as a 0 if the switch is open and a 1 when closed

[Adee]

All my diagnostics screen shows is whats below,
But with no mention of 'toolchanger'

inputs: 01001111
printer: 10
DIL swictches :110011
Cassette: 0011
M/C switches: 1111
Datums: 1100
Step Direction: 11000000
Drive Fault: 1100

Is it common that the sensors which look at the timing disc thingy, malfunction?

Adee

[cncbasher]

check around the switches for swarf etc , it could be that simple , or a broken wire

[SimonRafferty]

On mine, the infra red LED's on the slotted sensors had all blown! Fortunately, the part numbers for replacements (from RS) are printed on the sensors.

Even LED's have a finite life - and I guess on mine they were past it. I imagine the same is true on yours.

Si

[Adee]

Thanks for everybodies input, I have got the tool changer working again!
For future reference for anyone, the problem ended up being corrosion on the circuit board, I gave it a clean up and seems to work fine.
Also if anyone wants the timing position of the timing disc, I can forward a pic and details.

Adee