Let the fun begin !!! ???

[PAULRO]

cheers for the link Eddie. i was just about to press the go button on this http://ie.rs-online.com/web/p/alumin...itors/0497596/ . i can get the bridge there alsohttp://www.rapidonline.com/electroni...-mb352-47-3226

[Clive S]

cheers for the link Eddie. i was just about to press the go button on this http://ie.rs-online.com/web/p/alumin...itors/0497596/ . i can get the bridge there alsohttp://www.rapidonline.com/electroni...-mb352-47-3226

Have a search online for the caps make sure they are rated to 100v or higher you might be able to find them cheaper is you buy say 4700uf and then double them up Rapid also does the transformer as well 25 - 0 - 25v and wire the coil in series to make 50V ..Clive

[PAULRO]

I would prefer to buy the drivers at Zapp but they have only 1 in stock. i phoned Gary but couldn't get through so i emailed him. Apparently the AM882 are discontinued and replaced with the EM806 which is'' the same or better specification as the AM8802 but a newer product'' . any thoughts on this would be helpful .

this is the psu coil Standard Range Toroidal Transformers- CM0750225- 750VA 230v to 2x25v delivery next friday 20th.
capacitor http---www.rapidonline.com-electroni...apacit-50-4017
bridge rectiferKbpc3502 35a 200v Bridge Rect (mb352) - Rapid Online.

[JAZZCNC]

I would prefer to buy the drivers at Zapp but they have only 1 in stock. i phoned Gary but couldn't get through so i emailed him. Apparently the AM882 are discontinued and replaced with the EM806 which is'' the same or better specification as the AM8802 but a newer product'' . any thoughts on this would be helpful .

Yes they are slightly better and are affectively same drive just with updated software which allows slightly smoother running motors and less motor heating.
I've fitted loads of EM806 and If I had choice of AM or EM I'd get the EM everytime.

[JAZZCNC]

this is the psu coil Standard Range Toroidal Transformers- CM0750225- 750VA 230v to 2x25v delivery next friday 20th.

You don't need 750Va and could getaway with 625Va easily. Going large on the Va will just cause you more hassle with inrush and the extra current it provides you won't use or need.!

[PAULRO]

cheers for the driver info. i had calculated for 5 motors even though i will only use 4 for the time being . the 5 will draw 13.2 amps @70 vdc hence the 750 VA.
The 625 VA delivers 11.90 amps. i hope my calcs are correct! is there a way around the in rush of current?

[JAZZCNC]

is there a way around the in rush of current?

Yes Don't turn it ON. . .

You can build an inrush circuit using resistors, thermisters etc but I prefer to avoid this and use smallest transformer possible and then use a C or D rated fuse if still trips which I rarely do upto 625va. Can use slow blow fuses as well.

To be honest I very much doubt you'll ever run 5 Motors at same time that pull full amps at same time so I'd still go with 625Va and 12A.

[IanS1]

As all 5 motors won't be drawing maximum current at the same time, allowing for around 70% of the total quoted current draw should be plenty.

[PAULRO]

625 VA it is then ! every day is a day for learning.

[PAULRO]

so i need 4 drivers EM806 a break out board and a smooth stepper. can anyone recommend a smooth stepper and a breakout board that's compatible with the drivers and where's the best place to purchase ?