Acorn and Accelus drive connections.

[RonRindahl]

I Have the same drives on an old Bridgeport I am starting to retrofit. Bought an Acorn over the weekend to replace the old motion controls from CNC Pro.

Old system jogged around fine, but not sure where I need to land the wires onto the Acorn when I receive it. I have attached a map of the pins that the original cable was using for control as far as where they landed on the Accelus drive, don't have documentation on the CNC Pro side.

In looking closer at the old system, the software if actually CNC Pro, in use on a Navigator II NC-PC Control made by Enhanced Automation.

I got some feedback on an old thread, but got directed to start a new thread. Am thinking I might need to re-configure the drive to interact with the Acorn board. But really not sure how to translate all the parameters.

Also attached the PDF of the drives cut sheet, not much more documentation than that available as far as I can find.

Thanks,
Ron

[centroid467]

Do you have the software and cable for programming the drives? If so, we could probably help you find the correct options if you can post screenshots of the relevant menus and so on.

[RonRindahl]

Have a cable on the way. Will try and connect an post some screen shots later this week.

[RonRindahl]

Was reading through the CME User guide this morning. Looks like I can configure the I/O ports with multiple options (starts on page 52). Not clear to me what options to use. Attaching manual.

[centroid467]

From the user guide you uploaded, I would set up the I/O like this:
*All used inputs set to pull up - that should include IN5 and IN6.
*All unused inputs should be set to "Not configured".
*IN2 is supposedly a dedicated Enable input so I would set IN2 as "Amp Enable-LO Enables With Clear Faults".
*OUT1 to "Fault Active Low" or "Fault Active High" depending on the wiring - more on this in a bit.

*I believe that setting the amplifier to position mode will make the correct function settings for IN5 and IN6. You'll want to follow the instructions on page 68 for that and set it to "Pulse and Direction" and 1 = 1 stepping resolution.


Since the outputs are open drain MOSFETs, it could be set up in a few different ways. Generally, I would recommend wiring all of the drive faults to a single Acorn input (DriveOK) and set IN1 as "Fault Active Low".

[RonRindahl]

So I finally got the panel re-built, and everything powered up. Decided to work on the Y-Axis first. After I saved the original configuration pulled from the drive, I configured that drive per centroid467's recommendations and connected J3 pins 3 {IN6},4 {IN5}, and 5 {IN2} from the drive side to pins H2-ST2, H2-DR2, and H2-EN2 on the Acorn screw terminal connector.
I am able to jog the motor when connected to the drive VIA the CME configuration software, but am unable to make it move with the CNC12 software. Have CNC12 configured to use the screw connections and the 5vdc coming out of the EN2 lead does enable the drive. But thinking I am not getting step and direction signals sent when I press the jog buttons on the screen.
Is there a way to verify the signal is being sent within CNC12 or by metering the ST2 and DR2 pins?

[centroid467]

Could you please post a report from CNC12? This will help us determine if you have any settings incorrect there.

Verify that the e-stop and VCP reset buttons are not engaged.

You can use an oscilloscope to directly see the output signals on the ST2 and DR2 pins. A multimeter would work fine for the Direction pins as that only changes with the direction.

Step signal is harder to measure on a multimeter but if the signal was being driven correctly you would see something other than ~0 volts or ~5 volts. Set continuous jogging and hold the jog button.

Regardless of which tool you have available, measure from the Acorn power supply common/ground to the pin on H2. I would also suggest measuring at the drive end of the wiring to confirm that the same signal is seen on both ends.

[RonRindahl]

There is no E-Stop on the system currently. No voltage present on the direction pin when I try to jog the motor either direction. Report attached.

[RonRindahl]

I found one of my mistakes. I needed to invert my lube pump signal. Acorn saw it as a fault. Now have voltage on direction signal that changes state when using positive and negative directions. Also numbers on Y-axis move now. But still no movement on the motor itself. I'm thinking I have some parameters in CME software incorrect yet.

[RonRindahl]

Did a little playing today. Attached a screenshot of CME I/O monitoring screen that shows pin states. As expected Pin 5 changes state when jogging opposite directions in CNC12 software. Currently negative direction causes it to go low in drive.

I hooked my oscilloscope (Snap-On Modis Meter) up to the step lead and ground and get a little noise on it when I'm in the 200mV range while jogging. Not really sure I'm using the meter correctly as I do not use it much for this type of function. Regardless, pin 6 on the CME monitor side does not change state and motor does not move. Numbers on CNC12 display change as though it's moving, but no motion on motor. I double checked jogging functionality with the CME software and the motor jogs as it should with the CME interface. Also checked for voltage presence while jogging between acorn H2-comm and H2-DR2 and meter never reads anything other than zero.

Also attaching a current report from CNC12 now that I have my lube fault corrected.

Thanks,
Ron