Hi Moray,

Nice.  I don't see any power supply bypass Capacitors.  You might want to add a 0.1uf Ceramic near each IC and a 10uf Tantalum near the power connector.

Actually we have been thinking to do something along those lines as well.  We were thinking to use RJ45 connectors instead of the Screw Terminals and include power and GND and shield.  Also to allow for JP4 and JP5 connections to have an option to pick off 4 Step/Dir Signals from those instead of JP5.  As well as to provide differential encoder input options.

 

Hi Tom,

thanks for the info.

I dug through the parts collection today, and I've got some 4k7 0603 resistors already, so I'll use them rather than add to the parts collection.

I've attached a 3D render of what I've designed. I'll hopefully get the circuit boards ordered at the start of the week.

Thanks,

Moray

On Thu, Oct 13, 2016 at 8:38 PM, Tom Kerekes tk@... [DynoMotion] <DynoMotion@yahoogroups.com> wrote:

 

Hi Moray,

JP5 pins have 47 ohm series resistors so with a 150 ohm pull down the High Level voltage would be marginal.  Consider a 1K or larger.

Regards

TK

On 10/12/2016 4:59 PM, Moray Cuthill moray.cuthill@... [DynoMotion] wrote:

 

Tom,

Thanks for the part suggestion.

Just a quick question, the AM26C31 differential driver chip datasheet advises pulling unused inputs to gnd.

Would the KFlop's JP5 used as step/dir output be OK driving the chips with a 150ohm resistor (as per certain terminals on JP4/6) pulling the terminals to Gnd?

Thanks,

Moray

On Mon, Oct 10, 2016 at 7:47 PM, Tom Kerekes tk@... [DynoMotion] <DynoMotion@yahoogroups.com> wrote:

 

Hi Moray,

Those drives still specify the 5us Direction Setup Time the same as older leadshine drives.

But KFLOP now provides more than 5us setup time so it should be compatible.

Cnc4pc sells these:

https://cnc4pc.com/differentia l-line-driver.html

Otherwise this device AM26C31 should work:

http://www.ti.com/lit/ds/slls8 71/slls871.pdf

Regards

TK

On 10/10/2016 3:12 AM, Moray Cuthill moray.cuthill@... [DynoMotion] wrote:

 

I'm hoping somebody on this list could maybe give me a suggestion for some suitable differential driver chips, that I could use to take the single ended step/dir signals from a KFlop, and make full use of the differential step/dir inputs on some Leadshine EM806 stepper drives?

Am I right in thinking the newer drives should be OK regarding direction/step pulse timing?

The manual can be found at http://www.leadshine.com/Uploa dFile/Down/EMhm_V1.1.pdf

and the signal timing details can be found on the page numbered 3, or 8 as numbered in Adobe.

Thanks,

Moray