Weird Stepper Sound

[ChipsFlyin]

I recently purchased 4 – KL-4030s, a C10 BoB and a 5v power supply from Automation Technologies. Connected these items to 4 – 425 oz in 4-wire motors. I used an existing 24v/5A power supply pushing out about 27v.
Now the weird part. If I run Y-A everything is good, all quiet. As soon as I run EITHER X or Z after running Y-A then both X and Z motors start to hum, quiet or a little louder at times. This anomaly seems to steal power from all 4 motors after that and they all run louder and clunkier. The humming can be stopped or started by where the motor is "clocked" inside itself, I think. I mean, I can stop the humming in X by very slight jogging of X then stop the noise from Z by "mini-movement" also.
If I unplug X and do this procedure again with only Z, then Z hums. If I unplug Z and do this procedure again with only X then X hums. But never Y –A! If only Z and Y-A are plugged in, Z runs perfectly quiet until I run Y-A. Likewise with X. My wiring looks like the diagram posted on their website. I set 1/8 microstep and 2.4 amps per 4030 driver (DIP switch 3, 5 & 7 made).
The Y & A motors never make a noise like X and Z but they all seem to lose power when the noise starts, even Y & A.
I contacted John @ Automation Technologies, all he suggested is to purchase one of his power supplies. Not much help for my current dilemma. I will probably do that whenever my money situation improves. But in the meantime what else can I do?
I hope someone can help. I don't have enough hair to pull anymore out!!

Thank-you.

[CarveOne]

Check your Mach3 or LinuxCNC settings to see if the Step and Direction signals are configured for Active High. If not, change and save the settings, restart the software, and see if the results are the same or no longer have the problem even if the motors go in the wrong direction. If the problem is cured, then reverse the wiring of one coil in any motor that goes the wrong way. This will reverse the motor direction. You will need to remap the jog key on the keyboard to match the motor direction.

The driver board could be getting a low logic voltage from the parallel port. If you can get to a place to measure it with a voltmeter, it should be low = less than 0.5v and high= greater than 5.0v. The parallel port cable needs to be attached to the C10 board to measure this. If your parallel port only puts out 3.5v or so, then you need a board that puts out the full 5v logic level. Some of the newer motor drivers can work with the lower voltage logic levels.


CarveOne

[Fastest1]

You running Mach? Do a fresh install. Worked wonders for the problems I was having. Most people didnt think my issues were related to Mach. My machine would have different approach speeds if different tools were called but all had the same feed rate.