hello
i bought a sieg c2 lathe labelled another brand. The previous owner had a problem with the control board . It has a 300w dc motor .
Is there a cheap solution for the control board? or should i fit a ac motor with a frequency modulator?
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To go variable-freq AC, you would need a VFD and a very small 3-phase induction motor.
You could fit a brushed single-phase AC motor ( universal motor ) and a Triac phase control ( "light dimmer" ), but would probably run into torque and cooling issues.
Either way, replacing the motor involves issues with motor size, speed, mountings, shaft diameter, pulleys, etc.
If you can get hold of the damaged board, here is a board repair service: http://olduhfguy.com/#
Apparently the American "KBIC-120" is a more reliable replacement board, but it is 120v AC input:
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I still have my kbic board and bigger (720-1200w) motor from my warco 240. The board did blow the SCR's which I replaced with new. It works fine, but the repair is not pretty.
A chinese Vfd and used 3ph 1hp-1kw motor will be best option and not too expensive, if you have space for it.
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will put a ac 3 phase motor on the mini lathe.
From 300w dc motor to a 1.5 kw ac motor,
the board has 2 problems :
1- the price
2- the failure rate of this boards . i think that most of this failures comes from setting the lathe speed to low sending a surge in current.
The 1.5kw is the motor that i have available.
I can change the 550w ac motor from the bv20l clone that i have and install the 1,5kw on the bv20l.
I have a smaller 0,37kw but i think that will be weaker that the 300w dc motor.
Another question:
LY-820 board looks a bit smaller than the original c2 board. the transistors on the original are 4 or 5 on the ly-820 i think there are only 2.
The LY-820 board can handle as good as the original board? on the low rpm high torque?