Sieg mill circuit board

[Alan Marshall 1Participant @alanmarshall1]

My Arc Eurotrade X1 mill developed a fault and the motor control would not run correctly. The motor control, board was of the type FC150BJ which is no longer available but the replacement is supposed to be XMT2315.
I have purchased this from Arc eurotrade but it comes with no circuit connection information. I do have the correct potentiomenter for it.
Having explored the web The Clark Lathe manual has a connection drawing which I have tried but does not work.

Has anyone successfully fitted this board into nthe X! mill? If so what connectiuon arrangement is used.

The connections for the XMT2315 I have tried without success are:

gan… not used
L1 neutral
L2 Live 240V
A- DC out
A+ DC out

K1 and K2 I am unsure I have tried with a switch contact from the on/off/reverse and with no connection at all.

The poetentiometer wires are the same for both boards and go to a plug/socket arrangement.

[Alan Marshall 1Participant @alanmarshall1]

connections

[EmgeeParticipant @emgee]

I notice in an article to fit the replacement board you need to have the matching pot, perhaps the pot you are using is not suitable, the following link goes to the pots on the ARC site.

**LINK**

Emgee

[JasonBModerator @jasonb]

Best bet is to contact the guys at ARC to check if the different board can be used and if so what to connect. Trying random connections could damage the new board. I

[Alan Marshall 1Participant @alanmarshall1]

Thanks both, I have the correct pot and arceuro sell the board as a replacement but without circuit data.

[EmgeeParticipant @emgee]

Alan

I'm sure if you contact them ARC will be helpful.

Emgee

[Neil AParticipant @neila]

Looking at the wiring diagram for the XMT-1115 board (110volts) on the little machine shop web site it seems that there should be either a bridging connection or an emergency stop switch between the K3 and K4 connections for the board to function.

https://littlemachineshop.com/images/gallery/drawings/4512-XMT-X1MicroMill.pdf

But I think that I would take Jason's advice and talk it through with the people at ARC before going any further.

Neil

[Alan Marshall 1Participant @alanmarshall1]

That is an interesting circuit because it shows a link for an emergencey stop between K3 and K4 I do not have that link in.
I have spoken to Arc and they want the board back to check that it works in their mill. I will be speaking to them again once they have received it and will ask them about the ES link.

[John RuddParticipant @johnrudd16576]

Alan,

PM sent to ….

[Ian Johnson 1Participant @ianjohnson1]

I would be interested in the outcome for your repair Alan, I have the warco version of this micro mill, bought it years ago, and my circuit board recently developed a fault. It would not go down to zero revs and would start on about 500 revs, so no speed control between 0-500ish, above that it controls the revs as normal. Thinking it was the potentiometer I replaced it, but at the time I couldn't get a 4.7ohm pot so I stuck in a 5ohm pot, no improvement, although the abnormal light came on, which it didn't before.

I would be grateful if you would post up your remedy.

Regards

IanJ

[Alan Marshall 1Participant @alanmarshall1]

I will Ian, when its resolved.

[Anthony KnightsParticipant @anthonyknights16741]

Posted by Ian Johnson 1 on 15/04/2023 10:33:56:

Thinking it was the potentiometer I replaced it, but at the time I couldn't get a 4.7ohm pot so I stuck in a 5ohm pot, no improvement, although the abnormal light came on, which it didn't before.

I would be grateful if you would post up your remedy.

Regards

IanJ

I think you must have meant a 4.7 or 5 K ohm pot.

[Alan Marshall 1Participant @alanmarshall1]

I am happy to say the new circuit board XMT2315 is now working on my mill. A big thank you to Arc for their assistance.

For the record the XMT 2315 board requires a different potentiometer to the original so if you do get the new board from Arc, get the matching potentiometer too.

The new board has clearly marked connectors for L1 and L2 being mains and DC+ and DC- for the motor. the switch on the potentiometer has its terminals at the back A and B and these go to K1 and K2. There is a connector marked GAN this is an earth connection and need not be connected as it goes nowhere on the board. There is another terminal block towards the rear of the board having two terminals. This is for an Estop switch and needs a link if no Estop switch is present. The pot three leads on a plug just plug into the board.

I did a mod to the wiring as the original has the live neutral going to the common of the orange and green lamps. I cut this and made the neutral termination direct into the board ( My green lamp was defunct anyway). If you do not want to do this a new wire will need to be soldered in place to get the live neutral to the board.

The rear switch on the mains switch with wires identified 6 and 7 is not used so these wires can be removed or isolated.

The only peculiarity of all the above is that the orange lamp is now on when running. But I guess that is no worry.

The motor sound different when running and I guess this is due to the replacement board being a SCR (Thyrister) control rather than a PWM (pulse width modulated) control.

My next check is to see how it performs under load. Hopefully I will see no difference.

[Ian Johnson 1Participant @ianjohnson1]

Sounds like a good replacement for the FC150BJ control board. Hopefully it will perform as normal.

Thanks for the wiring details Alan.

I think a call to Arc euro is due soon, get mine sorted out.

IanJ

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