Spindle Control with Mesa and DMM DYN4

I recently wired up a power box for a DMM AC servo that I intend to use as a spindle motor. The motor works as it should when I control it via Windows and the DMM software. Now its time to wire it up for linuxCNC control. I was hoping I could get someone to double check me before I wired everything up.

DYN4 Manual: www.dmm-tech.com/Files/DYN4MS-ZM7-A10A.pdf
Page 11 is where the pin descriptions start

I am wiring to a 7i76 and only need to the spindle to rotate in one direction (ie. I will not be ridgid tapping) and do not have a brake on the motor. I have a DB29 BoB and plan on using the wiring attached. Does this look right? Is there anything I am missing?

PCW to the rescue on your question.

Not required but I would also connect the JP5 encoder output so that LCNC can tell when the spindle has reached the commanded speed and then commence motion. If you are geared 1:1 with the spindle it is an easy hookup to the encoder input on TB3.

This is a great thread as I’m connecting up the same kit.

I'm using a 7i83 for +- 0~10 control. Are you gearing at 1:1 to the spindle? If not I have a circuit that I know works using a slot type opto-sensor.

JohnnyCNC wrote: I'm using a 7i83 for +- 0~10 control. Are you gearing at 1:1 to the spindle? If not I have a circuit that I know works using a slot type opto-sensor.

I plan on using a 2:1 ratio. I havent thought of the implications here since I only have an encoder on the motor, not the spindle.

Since you are gearing the motor other than 1:1 you need the index pulse (Z signal) to come from the spindle at 1 pulse per revolution. The A&B signals will come from the encoder output of the DYN4 drive. This is what I did using the following parts:

220 ohm resistor
Sharp Microelectronics GP1A51HRJ00F


GP1A51HRJ00F to Mesa 7i76

Pin 1 220 ohm resistor to pin 3
Pin 2 & 5 to TB3-15 (GND)
Pin 3 to TB3-12 (+5VP)
Pin 4 to TB3-13 (IDX+)

This is the pin layout looking at the back of the sensor.


This is what the install looks like on my machine.


If you happen to see other pictures of my machine that shows two of these mounted on the spindle the second one feeds the RPM display of the DRO I have on my mill.

Yes. I have done it that way on several machines but always had the ZAB from the same slotted disc but was not sure about the servo not being in direct sync with the Z sensor