Messages

21

General Mach Discussion / Re: Manual pulse encoder & mach3

« on: January 29, 2022, 01:34:15 PM »

Is this true?
Both motors have been turned in both directions.
Both MPGs have turned a motor in both directions.

If Graig's information about the MPGs is correct the high output voltage should be the zener voltage.   2.9V doesn't seem right.
If the pullup resistors are working correctly an input with nothing connected should measure 5V. Check the ones you are using.

22

General Mach Discussion / Re: Manual pulse encoder & mach3

« on: January 29, 2022, 01:12:36 PM »

Oops, meant to say can you change the setup.

23

General Mach Discussion / Re: Manual pulse encoder & mach3

« on: January 29, 2022, 01:05:08 PM »

Testing so far has shown the drives are OK and both MPGs work.
Measuring voltages at the BoB will show if the wiring is OK and the signals are reaching the inputs.
It could be a bad BoB input. Can you can the setup to use other inputs?

24

General Mach Discussion / Re: Manual pulse encoder & mach3

« on: January 29, 2022, 12:37:50 PM »

Have you tried moving the MPG outputs to different inputs? You could exchange the two MPGs. If the problem remains the same, that is X moving incorrectly, then the problem is in the BoB or the setup.

25

General Mach Discussion / Re: Manual pulse encoder & mach3

« on: January 29, 2022, 12:23:33 PM »

Measuring the output voltages will tell you if a MPG is bad or marginal. Please report back on the high and low voltages of each output. You could even check the working one for reference.

26

General Mach Discussion / Re: Manual pulse encoder & mach3

« on: January 29, 2022, 11:59:31 AM »

When you switched the MPGs, was that in software or hardware?

The commons of the MPGs are tied together by the white power supply wire, one connection to the BoB is enough.

27

General Mach Discussion / Re: Manual pulse encoder & mach3

« on: January 29, 2022, 11:47:57 AM »

Kyle,
It looks like one of the signals from the encoder is not making its way in to the MACH logic. It could be hardware or it could be software setup. Use your meter to check the input levels.
 You could have the problem with the input not going low enough. If so, a workaround would be to try a different input until the problem is properly fixed.

John

28

General Mach Discussion / Re: Manual pulse encoder & mach3

« on: January 29, 2022, 12:30:15 AM »

Hi Kyle,
I have looked at the photos, here is what I see,
The Zener diodes appear to be backwards, the end with the band should be connected to the input.

Jumper settings:
COM = GND
Pins 2-9 = Inputs
Pins 2-9 = PullUps
These are what I expected

Pins 10..15 = PullDown
Is this what you want? What are you connecting to these?

Check the voltage on the encoder inputs, They should switch from 4.7V to less than 1.6V. Lower than 1V would be even better.

John

29

General Mach Discussion / Re: Manual pulse encoder & mach3

« on: January 25, 2022, 08:27:47 PM »

After you make the circuit with the zener measure the high and low logic levels again. The highs will be the zener voltage (4.7V). The lows should be under 1.6V to meet the minimum spec. The actual threshold may well be higher but you can't count on that - design for worst case.

30

General Mach Discussion / Re: Manual pulse encoder & mach3

« on: January 25, 2022, 08:15:56 PM »

I agree, the physically simpler solution is better if possible.