A/C servo spindle motor <Resolved>

[cj110109]

Hello, I have a question, and I haven't made any attempt to do it so a report wouldn't have any relevant information, I have an A/C Servo motor and driver for the spindle on my CNC machine, it's a langmuir systems MR-1, and I can't seem to find any information on how to connect it, I found the schematic for my clearpath motion system servo motors, but the spindle is a nema 56 3.6 hp A/C servo. I've attached a photo of the 5 pin connector that was connected to the original board as well as a close up of the 5 pins it was connected to with the abbreviated label of each pin, the 24v and 0v are pretty obvious, but I'm not sure where to connect them on this board, also I have attached a photo of my electronics enclosure, and there is only one stepper which is what the one driver is for on the z axis. Rather than a break, but I may switch that to a nema 34 a/c servo with built in brake later so for both reasons it would be helpful for me and I'm sure for others to have this information. Can someone give me a hand as I have the motion system all set, and this is the only thing left stopping me from being able to use the CNC machine again after switching boards. I appreciate any help anyone can offer.

[centroid467]

Is the spindle driver the device underneath the Acorn? Can you find any identifying marks or nameplate on it or get a picture of the terminal labels?

My best guess without that information is that COM is the overall power supply ground, SSPD is the spindle speed output to the drive which may be analog or PWM, +24V DRV is likely drive input supply but could either be an input or an output, 0V DRV is likely the 0V reference for the drive inputs, and SPEN is likely the spindle enable (on/off) signal.

With the spindle drive powered on, check the cable for 24V across the +24V DRV and 0V DRV wires. I believe that would be the red and black/green stripe wires but I may not be seeing them correctly in that photo.

[cj110109]

Thank you for the reply, so the model number of the servo drive is MR1LS- I forget the rest, but that’s the same model as the CNC machine, so they had these servo drives custom-made. Which makes me think it’s probably step and direction controlled, but you’re definitely right about the spindle enable and speed, I just don’t know how to get those connected with this board? The wiring to the servo drive is the same as any other AC servo, they have a 25 or 37 pin cable that has all of the low-voltage, and then just a few wires that go to the actual motor for high voltage and power input, it has all the same parameters that can be changed on the servo drive, but I don’t want to change anything because it was working with that board, unless I know what I’m doing, which I don’t because I don’t have access to the information on the parameters and they vary from Drive to drive with servo motors. I’ve had a few AC servo motors that were dramatically different in the parameter settings, so I don’t want to mess with anything if I don’t know what the perimeters mean. It gives you almost no information on the screen if you’ve never used one, you have literally one letter and a number that means something, and without the key and all the information you have no idea what it means so for now I’m just leaving it the way it is, but I’ve gotten everything else working except the flood cooling, that I just haven’t gotten to yet, but I’ve got the limit switch is working the homing with the Clearpath hard up as well, the whole motion system is going, but kind of hard to make use of it without a spindle. lol. I have a VFD and 3.5 KW spindle motor in a square housing, but I am hesitant to change from the servo drive and motor because they are just so much more powerful with torque, that motor gets 18,000 RPM and it’s 5 hp but I don’t think it has nearly the torque of a 3.6 hp nema 56 servo.

[cj110109]

Hey, by the way, I figured this out. I found all the documentation online on GitHub on the MR-1 github. In case anyone else needs it, so you can set the servo to be PWM, step direction, and PWM -10 - +10, 0 - 10, -5 - +5, 0 - 5, etc, so I went with 0-10. Here is documentation and the manual for the servo drive in case anyone else needs the information...

[cnckeith]

cool! thanks for posting.

[cj110109]

Of course, I brought it up, only right to share the solution... I hope it helps someone.