Idle Current Reduction

[BOBINETTE]

Something is not working properly my Hobby CNC board, when I put the J4 jumper in place there is no current reduction and if I take it off the motor can't move the grandtry, as soon has I put it back in place the grandtray starts moving, this is only on the grandtray axis, any idea what is the problem I have tryed to plug it in the X axis and it is the same thing (J4 in place = OK, Remove = won't move).
Mach3 for the software
Thank you for the info

[BobF]

See if this helps.
Current Reduction, HobbyCNC - Mach3

[BOBINETTE]

Thank you for the link, I will most likely try it. Right now I'm operating with J4 off on 2 axis and none on the other.

[jalessi]

Edward,

If the motor is stalling with current reduction enabled, try raising the Motor Acceleration on the offending axis.

Jeff...

[m1911bldr]

I'm having a little, intermittent, problem with my X axis stalling if it tries to start after current reduction has kicked in. I'm thinking of doing the mod to let Mach 3 run the current reduciton. Anyone done this yet? Results??? Oh, and why would you increase acceleration to overcome this? I've got my acceleration backed down to 2 and it has helped a lot but not completely solved the problem.

[lsalme]

I ran my jumper wires exactly per Erniebro's photo shown in the board mod thread. The current reduction mod works great on my Joes 4x4 hybrid. Initially i had low power going to my motors but my Mach port/pin settings were incorrect. My build was new so i had fewer components to install, if you are going to revise a populated board you will need to remove components as instructed.

[m1911bldr]

I haven't had time to do the mods to my board to use Mach 3 for current reduction control but I have incorporated a simple work-around. I installed a switch that takes the place of the J4 jumpers on all the axes. I turn current reduction off during program runs and turn it back on during material loads/other long periods of idle time. I kept all the axes separate -using a 3-pole, single throw switch - since I haven't researched the J4 circuit to see if it would be OK to tie them all together through a single pole switch. Dave (HobbyCNC) reluctantly agreed (doesn't like ANY mods to his boards) that switching current reduction from enabled to disabled would not harm the board if switched with power on.

[ianober]

I read the mod and was wondering if anyone has done this to the EZ version of the board. It has the same components that are removed in the instructions so I would assume this is ok, no?

[flakey]

I cannot get the size wire here . can you use the wire that comes with the kit? strand it and use the wires inside?