Anyone familiar with motion controllers/software which can support dual loop control?

[mcardoso]

I am currently running Mach 4 with Allen Bradley Ultra 3000 AC servo drives. This is open loop from the perspective of the control, but closed loop at the motor. I am curious (educational use only) if there are any control setups that would allow a second position loop to be closed at the control using glass scales mounted on the machine. I could setup the servos as velocity loop only and use a control like CSLabs CSMIO to close the position loop, but I have never seen a Step/Dir controller which allowed you to close the loop.

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[Jim Dawson]

Galil Motion Control products do that. And if the plugin is working should be compatible with Mach4. Not sure if Mach4 supports dual loop setups.

[squirrel_41]

I don't know if I am reading this correct but I am using Yaskawa AC servos these can be configured to out put a error if it they do not arrive at the requested position I use this error in Mach3 to shut down the system.

[Connor]

LinuxCNC can do this for you.

[PCW_MESA]

I am currently running Mach 4 with Allen Bradley Ultra 3000 AC servo drives. This is open loop from the perspective of the control, but closed loop at the motor. I am curious (educational use only) if there are any control setups that would allow a second position loop to be closed at the control using glass scales mounted on the machine. I could setup the servos as velocity loop only and use a control like CSLabs CSMIO to close the position loop, but I have never seen a Step/Dir controller which allowed you to close the loop.

LinuxCNC can do this

Here's some real experience with LinuxCNC/Low end stepper machine/Linear encoder feedback:

[DLF]

Option 1: Delta AC servo controllers have both motor encoder input and table linear encoder input. They have encoder output signal + position error alarm signal. Dual loop can be closed at the servo controller.

Option 2: SZGH Auto CNC controllers (china) have encoder inputs for each axis. Dual loop can be closed at the controller.

Option 3: combination of the 2 above

I started to cnc my mill using option 2. I do not know at the moment how it will work

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