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Hi John, my two H bridges are both L298N coupled with a PIC 16F87 I/P.Quote:
Originally Posted by john swift
If it's the H bridges that need replaced that's no big deal but if it's the PIC won't I be up the creek without a paddle? What is actually happening is that when I jog the motor in one direction then stop, then jog in the same direction again, the motor doesn't always go in the right direction.
David
Hi Dave
I'm assuming the board has a L297 driving the two L298 ICs
they must of connected the two H bridges inside the L298N in parallel to make a higher current bridge
until CDE are back in business a faulty PIC is a problem
unless your lucky and the PIC program is not protected so you can copy a working PIC - a bit of a long shot I know
for now I would swap the faulty drive with a working drive to prove the driver is the problem and not the control board
changing the switch settings that determines which axis commands the board responds to may be enough instead of physically moving the board – just avoid jogging into an end stop
with a logic probe you monitor the L297 direction pin to see if its the PIC or L297
John
Hi John
Thanks again for your help. I've swapped the faulty drive for the other which is known to be ok and it is working just fine. If I could just find a CDE X641SC stepper conversion card then I'd be laughing. I'd be able to fit other drivers. I'm really struggling with this but I don't want to harass the guy for the drives if he is in hospital!