Let the fun begin !!! ???

**PAULRO** · 13-02-2015

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** · 13-02-2015

Originally Posted by 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 .

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** · 13-02-2015

Originally Posted by PAULRO

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** · 13-02-2015

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** · 13-02-2015

Originally Posted by PAULRO

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** · 13-02-2015

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** · 13-02-2015

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

**PAULRO** · 14-02-2015

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 ?

**EddyCurrent** · 16-02-2015

Originally Posted by 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 ?

Smooth Stepper is the name of a particular motion controller, it's not a generic name. http://www.amadeal.co.uk/acatalog/Pa...cessories.html
There are alternatives to the smooth stepper, have a read here; http://www.mycncuk.com/threads/7718-Usb-smooth-stepper some have the breakout board built in I think.

**PAULRO** · 20-02-2015

I have the PLCM-E3 motion control & PLC4X-G2 breakout board ordered but they will not be with me until march because of Chinese new year. i am using the time to try and get to grips with the electrics / electronics and hopefully start into the MACH 3 (getting to know you period !!) i know some builders on here do not use bleed resistors to drain the caps from the power supply . i was going to leave the drives drain the caps as suggested on various posts but on second thought said i would at least try and get to understand how it done and maybe use a bleed resistor across the n/c contact of the e/ stop relay to keep to good practice and safety as pointed out. i came across this https://www.digikey.com/document-red...calculator.xls i have a result of 1000 ohms over 35 seconds with initial power at 4.9 watts. OR 1710 ohms for 60 seconds with initial power of 2.8 watts. i don't know if these resistors are viable because i've absolutely no prior experience to work from. maybe they will do or perhaps previous builders use a different spec. i have also updated my electrical dwg to reflect my proposed capacitor bleed arrangement. any feedback on this will once again be greatly appreciated.