SIEG C6 Board photo

OK, what I believe you have there is an SCR controller similar to the KB electronics designs. Probably several solid state components are damaged. The chip in question is most likely a LM324 quad op amp, but something else failing on the board blew it up. You would need to check all the power devices and the power rectifiers D16 thru D19. You might be better off trying to find a replacement controller (like the aforementioned KB brand) You can often find them on Ebay for less than 100$ US
-M
 
Thanks a lot for taking the time to help me on this.

You obviously know what you are talking about so I’ll give up on this board now. It’s worrying that the “specialist” didn’t make the same points as you. He basically said we can change the chip and all would be good.

Do you happen to know if the controllers you mentioned would be a relatively straight swap?

Also, while I have you expert eyes on the job, I came across another way to do it without the board.

What do you think of getting it running by using a simple rectifier and a voltage regulator as below? Could this be bad for the motor?


ICQUANZX AC 220V 4000W High Power SCR Electronic Voltage Regulator Governor Dimmer Thermostat Speed Controller

ARCELI AC 220V 4000W High Power SCR Electronic Voltage Regulator Governor Dimmer Thermostat Speed Controller: Amazon.co.uk: DIY & Tools

ARCELI AC 220V 4000W High Power SCR Electronic Voltage Regulator Governor Dimmer Thermostat Speed Controller: Amazon.co.uk: DIY & Tools
www.amazon.co.uk

Thanks again


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This person repairs the boards for a flat rate of $50 USD. States he will ship international First Class for an additional fee.

olduhfguy.com

Olduhfguy.com

Repair Service for Mini Lathes and Mini Mills
olduhfguy.com olduhfguy.com
 
Thanks for that. That looks like the guy I need! I’ll keep him in mind when I decide what do do. I wonder how long postage will take with the world the way it is at the moment...


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Hi Professor: Yes you could run the machine from a simple dimmer circuit + bridge rectifier but you would not have good speed regulation under varying loads, which a feedback style SCR controller gives you. You could also use a variac + bridge
I was going to suggest olduhfguy.com but the shipping could be prohibitive. I'd offer to fix it for less than 50$ if you were willing to pay the postage to and from the US. The turnaround time might be an issue because of the pandemic.
The KB brand controllers would be compatible, except for the physical size. Actually they are a little smaller I think.
KBIC-125 is one model I have used- You would need a KBIC-225 for 240 volt mains if I remember correctly
You might contact olduhfguy and ask if he has any extra Seig boards for sale-? Just a thought
 
Last edited:
markba633csi said:
Hi Professor: Yes you could run the machine from a simple dimmer circuit + bridge rectifier but you would not have good speed regulation under varying loads, which a feedback style SCR controller gives you. You could also use a variac + bridge
I was going to suggest olduhfguy.com but the shipping could be prohibitive. I'd offer to fix it for less than 50$ if you were willing to pay the postage to and from the US. The turnaround time might be an issue because of the pandemic.
The KB brand controllers would be compatible, except for the physical size. Actually they are a little smaller I think.
KBIC-125 is one model I have used- You would need a KBIC-225 for 240 volt mains if I remember correctly
You might contact olduhfguy and ask if he has any extra Seig boards for sale-? Just a thought
Click to expand...

I am humbled by the support I’ve received. Thanks so much.

I was just about to take you up on your offer to repair but I believe I have found the board I need on eBay, thanks to you. Would you mind having a look over it and confirming it’s right?
Also, 240v is what I’m on, on this side of the pond.


www.ebay.co.uk

KB Electronics KBIC-225 SCR Chassis Drive, 9432L, 1/50-3HP @ 230VAC 50/60Hz In | eBay

Find many great new & used options and get the best deals for KB Electronics KBIC-225 SCR Chassis Drive, 9432L, 1/50-3HP @ 230VAC 50/60Hz In at the best online prices at eBay! Free delivery for many products!
www.ebay.co.uk


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Yes indeed that would fit the bill, notice the orange tag on the board: there is an additional item you need which is a "horsepower resistor", it is a current sensing resistor that plugs into the board. KB sells them, I added a link. The ohm value of the resistor depends on the horsepower rating of the motor you use with the controller. KB has/had a chart online listing those resistors- I'll post it if I can find it
You might want to put a 3AG style fuse holder and fuses on your shopping list as well, not expensive and good insurance- for a 1/3HP 240 volt motor something like 3 amp would be appropriate, between the mains and the controller.
-M
The vendor might/might not provide the HP resistor with purchase of a controller- they should provide a panel-mount potentiometer and some fast-on terminals to connect the unit- ask what is in the package when ordering
www.ebay.co.uk

KB Electronics Plug-In Horsepower Resistors, KBIC KBMM KBPB KBCC KBWM KBMD | eBay

KB Electronics Plug-In Horsepower Resistor Selection Chart Motor Horsepower Range. 1/12 – 1/8 1/6 – ¼ 0.7 – 1 0.18 9837 ¼ ½ 1/3 ¾ 2.5. 1/30 – 1/20 1/15 – 1/10 0.3 – 0.5 0.35 9835 - - - - -. 1/50 – 1/30 1/25 – 1/15 0.2 – 0.3 0.51 9834 1/15 – 1/10 1/6 – 1/5 1/12 – 1/8 1/6 – ¼ 0.7 – 1.
www.ebay.co.uk
 
Last edited:
markba633csi said:
Yes that would work, notice the orange tag on the board: there is an additional item you need which is a "horsepower resistor", it is a current sensing resistor that plugs into the board. KB sells them or you can wind your own. The ohm value of the resistor depends on the horsepower rating of the motor you use with the controller. KB has/had a chart online listing those resistors- I'll post it if I can find it
-M
Click to expand...

Ok I will place the order now.
Thanks


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markba633csi said:
The vendor might provide the HP resistor with purchase of a controller- they should also provide a panel-mount potentiometer and some fast-on terminals to connect the unit- ask what is in the package when ordering
Click to expand...

I have purchased the unit now, a bargain I think at £38. There appears to be a resistor with it, as on the photo. Not sure what size though, I will ask. My motor is 1hp
d6f8ffe5afd27f11aa7dc2c01305e048.jpg



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800watts is what is on the front of the lathe which I believe is 1hp


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