No motor movement

[jimw]

Hi all and thanks in advance,

I stated out using a gecko 540 on the DB25 connector. I was using small motors and decided go with individual drivers and bigger motors. I get no motor movement since the change. I am using the wire connection desk test configuration. The driver is connected to the motor as I get holding torque. I have done voltage checks on the driver connectors on the acorn board as i press the direction arrows on cnc12 and get zero volts. I have not gone back to the gecko as I don't care if that works. Attached a report and picture.

report_20D7787D2396-0919226514_2024-03-15_20-20-56.zip

(847.63 KiB) Downloaded 1 time

[Gary Campbell]

Connect those LeadShine (clone) drives to the DB25 connector and make sure that you do not connect to the enable pin on the drive

[Ken Rychlik]

The switch on the side should also be in the 5v position and not 24v.

[amtekinc]

Why would connecting to the DB25 connector be any different than connecting to the headers? As far as I can determine from the documentation Stepperonline provides they seem to recommend staying with the 24 volt signals, which Acorn supplies handily. That being said, I cannot get my Acorn set up with the Chinese router config, to drive the motors which are energized and holding position. Pulse out from the Acorn fulfills the pulse width requirements of the driver. Tried inverting the signals, but that did not work either. By the way, my drives are the DM556T. Appreciate any of your wisdom. Thank you

[ShawnM]

Why would it be any different? Because they are both different types of outputs to drive different types of motors.

Do they work connected to the Acorn headers? Nope. Why you ask? Because those are 5v stepper drives that are to be wired to the DB25.

As noted all over this forum, stepper drives are wired to the Acorn's 5v TTL step and direction outputs via the DB25. The Acorn headers are "open collector" for use with servo drives. Again, you have a 5v stepper drive.

Follow Acorn documentation not Stepper Online.

The "fake" switch on the side of the drive that reads 5-24 is a misdirection. All it does when switched to 24 is add in a internal circuit to take the 24 volts back to 5v. Switch it to 5v as noted by Ken and wire them to the DB25 as noted by Gary and they will work.

[amtekinc]

Thanks for the info. The mfr. says if you add a 2 kohm resistor in series with the pulse and direction inputs that 24 vdc will work. This in an update to their original manual. I checked it out after running into the same problem that JimW had and sure enough the axes all started to work.

[tblough]

The 2K series resistor just drops the voltage. Save yourself trouble down the road and connect them according to the manufacturer of the CNC control who says to use the DB25 connector.

[ShawnM]

When you start missing steps or get no motor movement one day you'll understand why CENTROID, the manufacturer of the controller, tells you to wire 5V STEPPER drives to the DB25. Good luck. You've been warned.....twice.