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Sieg Micro mill problem.

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DavidA:
 thanks.

There does appear to be a problem with the pot.Rather the switch on the pot, the pot checks out ok.

I was just looking at the Arceuro Trading page on the parts.

It seems there are two different switches. depending upon the board.

One switch has open contacts when it is turned to the 'off' position i.e fully anti-clockwise.

The other has closed contacts in this situation.

My switch has open contacts in both 'on' and 'off' positions.

I noticed that the wires from the switch go directly to the lower two pins on the green connector strip (z1 and z2) if I remember correctly).

So I linked these two terminal to simulate a closed switch.

And what happened was I got the yellow 'Unnormal' operation light. Plus the green power light.

So, tomorrow, before removing the board (the ID appears to be on the bottom side) I'll just try it with the link disconnected. If it fires up then I know which version it is.

I don't suppose anyone knows if the switch is a dead short when the contacts are closed, or is there some resistance. i.e built in resistor inside the riveted shut switch body ?

I'll get back tomorrow with an update.

Dave.

John Rudd:
A better clue to which switch is needed, is the number from the speed control board..an XM number perhaps?

Ordinarily, the speed control pot has the contacts arranged such that at minimum speed the control switch is open and then goes closed when advanced...as described by your comment it would appear that the inverse causes the fault light to come on....

DavidA:
 John,

I ordered a new pot/switch today. The board is an XMT-2315.

So In a couple of days (hopefully) I will be able to see if it is that or a new board.

I was surprised, to put it mildly, at how badly the motor pinion is mounted. Not surprised that people finish up with wrecked gears.

Dave.

DavidA:
 The switch arrived this afternoon.

Half an hour later the machine was running again.

Thanks for all the advice on this problem.

Dave. :thumbup:

John Rudd:
Good to hear you got it sorted and working again

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