Sv 500 servo control box

Hi
about error 3 please make sure first dc voltage comining fro power board to servo board check J8,J28, second encoder signal from the motor is not supplied check J2,J29, third check connection between main board and servo board J11,J1
best regards
ashraf

I wasnt able to locate the sv-500 but juki but from the others I read its a head position detect failure.


Disconnection of synchronizer connector

(no signal from head position synchronizer)

Check the synchronizer connector (CN33)

So likely a common cause is a connector for the cable that comes from head to control board.

What do you mean by lock up? Does it go ahead and run after that? A servo motor always turns by hand. There isn't any moving mechanical parts inside a servo motor. It is electrical current that makes it stop and go.

hello
regarding error E730 only two way to resolve :
1- check connectors between motor and control box.
2- need to replace AC servo motor ( encoder was damaged )
best regards
ASHRAF ABOZID
[email protected]
Cairo - Egypt

Here is a manual for your machine that may be of some help:


http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&ved=0CB8QFjAA&url=http%3A%2F%2Fwww.juki.co.jp%2Findustrial_j%2Fdownload_j%2Fmanual_j%2Fddl8700b7%2Fmenu%2Fddl8700b7%2Fpdf%2Finstruction_eg.pdf&ei=aN-dVd6nGs7uoASo7Z_ABg&usg=AFQjCNELa9vBuXlODt-ff-b-EfwnMWW0dQ&bvm=bv.96952980,d.cGU&cad=rja

...

HI
regarding JUKI LK-1903B Eror E7:
1-Machine lock error ( The main shaft of the sewing machine does not rotate due to some troubles ). please check if machine rotate smoothly by hand or not.
2-main motor problem ( AC servo motor problem ) motor part No.:401-38137.
3- check connection CN-15 / CN-17 from SDC board to main motor.
4 - problem in SDC servo board ( No output for main motor ). SDC servo board part No.:401-42267.
best regards
ASHRAF ABOZID
[email protected]
CAIRO - EGYPT

You don't say if it is a clutch motor or a servo motor. They answer to your question is yes you can slow it down by either motor (usually a knob or switch) and by pulley. If you don't have a servo motor I would strongly urge you got contact Cobra Steve at leather sewing machine company (google it) Tell him you want one of the smart servo motors with needle position-er (needle up and down automatically)
His smart servo motors are also modified so they work very similar to home sewing machines... with graduated speed based on how hard you press the pedal.

But if you must and want to stick with a clutch motor... you might try this fellow's hack.

http://www.adafruit.com/blog/2007/11/08/hacking-an-industrial-sewing-machine-by-adjusting-the-clutch-motor/
.

Welcome to the world of industrial machines. As you are discovering they are not like a home machine. Typically these machines have either a clutch motor or if you are lucky a servo motor.

If you have a clutch motor there is typically a knob that allows you to slow it down. Or sometimes the pully needs to be replaced to "step down the speed"

A digital servo motor is a bit more complicated and you'll need to find some instruction on how to use it. But they can be easier to control. I've provided a video of the servo motor I have and recommend. (I sew heavy leather)

I have 1 pdf somewhere for a smart servo motor that might help. If yours is a servo, be careful because I got mine to run backwards once. lol Good luck

what sewing machine is it? (make/model)

Generally going to have to be addressing the drive motor, either substituting a lower speed clutch motor for the existing one, ie if you have 3000 rpm motor, then going to a 1725 rpm motor. Alternatively, selling the clutch motor and buying a servo motor instead, which should be available with a variable maximum speed control. The Sewquiet 4000 can select different speed ranges with the flick of a switch. If you already have a servo motor and it does not have a variable max speed, then switching the drive pulley on the servo motor to a smaller size should help
A more convoluted solution would be building a support under the table for a layshaft with different pulley sizes so that the motor could drive one pulley and then a smaller pulley on the shaft would drive the sewing machine. Not a bolt on solution but pretty cheap to do if you are good at fabricating.