Linistepper v2 problem

[DjD]

Hello all. I have problem my stepper goes one direction when LPT cable not in PC. If i put cable to PC stepper stop roatating. Why? What to do? Thanks.

[James Newton]

First, I don't see how that is a Linistepper v2 problem... it sounds like the driver is running the motor just great.

If you are using the old, old, old version of the 4 axis board, with the pulse circuit attached, then that is exactly caused by the intended operation of the pulse circuit. It is diving the x step pin with a resistor, so the parallel port will overcome the pulse signal when it is plugged in. Remove the resistor R9 and the pulses won't get to the x-step line and it won't rotate when not plugged in.

Or did you mean that it will not move at all (even when commanded by the PC) when the LPT cable is plugged in? In that case, the port setup or wiring is probably the problem.

MUCH more detail required for accurate answer.

[DjD]

Originally Posted by James Newton First, I don't see how that is a Linistepper v2 problem... it sounds like the driver is running the motor just great. If you are using the old, old, old version of the 4 axis board, with the pulse circuit attached, then that is exactly caused by the intended operation of the pulse circuit. It is diving the x step pin with a resistor, so the parallel port will overcome the pulse signal when it is plugged in. Remove the resistor R9 and the pulses won't get to the x-step line and it won't rotate when not plugged in. Or did you mean that it will not move at all (even when commanded by the PC) when the LPT cable is plugged in? In that case, the port setup or wiring is probably the problem. MUCH more detail required for accurate answer.

Thanks for your reply. I haven't used breakout board. STEP and DIR wires I connected directly to LPT port. When I plug LPT cable I can control stepper motor. Your post help me understand what is going on.

[James Newton]

RN1, the 3k3 network resistor should be pulling the step line low when the LPT cable is not connected. Check solder connections or remove the PIC and check for 3.3K Ohms between the step pin and ground.

[DjD]

Originally Posted by James Newton RN1, the 3k3 network resistor should be pulling the step line low when the LPT cable is not connected. Check solder connections or remove the PIC and check for 3.3K Ohms between the step pin and ground.

I used posix layout.

[James Newton]

Originally Posted by DjD I used posix layout.

Ok, so you are NOT using a Linistepper V2 then... you are using a Posix Linistepper which isn't a board layout we sell in the kit. Our version has the pull down resistors which prevent this problem. If you are using the Posix, you need to keep the cable connected or you need to add a pull down resistor of 3.3k ohm between the step line and the ground.

[DjD]

Originally Posted by James Newton Ok, so you are NOT using a Linistepper V2 then... you are using a Posix Linistepper which isn't a board layout we sell in the kit. Our version has the pull down resistors which prevent this problem. If you are using the Posix, you need to keep the cable connected or you need to add a pull down resistor of 3.3k ohm between the step line and the ground.

Sorry I'am write to late. Thanks for your reply, now I fixed this problem and I discover another: I power on linistepper, it is idle and two transistors getting very hot. Why it is hot when I do nothing?

[James Newton]

Originally Posted by DjD Sorry I'am write to late. Thanks for your reply, now I fixed this problem and I discover another: I power on linistepper, it is idle and two transistors getting very hot. Why it is hot when I do nothing?

This would be normal for any stepper driver. At any given point, two of the 4 transistors would be on, depending on which step you have stopped at. On the real linistepper, there is a low power hold line that can be engaged to reduce power when holding. I don't know if that was included on the Posix design.

[DjD]

Originally Posted by James Newton This would be normal for any stepper driver. At any given point, two of the 4 transistors would be on, depending on which step you have stopped at. On the real linistepper, there is a low power hold line that can be engaged to reduce power when holding. I don't know if that was included on the Posix design.

How to make a low power hold line in posix designed board? Also, what settings use in TuboCNC?

[James Newton]

Originally Posted by DjD How to make a low power hold line in posix designed board? Also, what settings use in TuboCNC?

I guess you would want to ask posix and the support forum at TurboCNC.

[DjD]

Originally Posted by James Newton I guess you would want to ask posix and the support forum at TurboCNC.

Okay I ask. Thanks.

[DjD]

Hi James. On posix layout with linistepper v2 firmware I found "enable" pin. Where should I connect it on BOB? How to configure Mach3 to work "enable"? Thanks.