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It seems about pitch error compensation problem.

Ser-Err (Servo Error) during first home find initiation.
Ser-Err (Servo Error) upon indexing.

Possible causes:
1- Faulty main cable or cable connector.
2- Table driving a heavy load.
3- Table...

Nice cards, good idea!

Looks like the power supply has some problems, check the input power and the wirings.

Better use NC based than PC based CNC controller.

Err 11 occurs when the motor is starting or stopping and it can be removed after re-power-on.
A. The default parameter of the motor set by drive unit is wrong.
B. Then load inertia is too large;...

Looks like some mechanical part inside the turret was broken.

The Baldor inverter is no more available?
It is better to use same old original Baldor inverter to get the best compatibility and best performance.

In the HPCC mode, the machine moved beyond the limit.

OR

Due to compensation, point of intersection calculation, interpolation or similar reasons, a movement distance that exceeds the maximum...

Do you mean the ball nut and the ball screw are not matched well, and the ball nut is wobbling.
If so might need to replace the whole ball screw and the nut, can not replace the nut only.

Sounds like the servo motor has problem.
If you have a spare motor, you can replace it and see if the problem still there or not.

Better use original and ask them from the manufacturer.

You can download the manual of Fagor 8055i at below page for your reference.
https://www.paycnc.com/info/fagor-cnc-8055-8055i-controller-operation-manual_i2657.html

We are using this one, so far so good.
https://www.youtube.com/watch?v=Qrhl9A1O7Tw

It looks like the switch issue.
The switch is located on the front of the spindle. There is an access panel if you drop z axis all the way down.
It has 2 bolts on it.
Took that off and the...

Very nice, thanks for sharing.

I saw it wrong at first glance, I thought it was MasterCAM, not MetaCAM.

It is not suggested to run the servo motor at higher than its rated speed
The motor or even the driver could be over heat and burnt.

What is the CNC controller brand and model name on your Citizen L20 turning machine?

Looks like the the problem come from the speed sensor or the feedback cable.

You can find this AC servo driver user manual at below page for your reference.
https://www.paycnc.com/info/sdfxwe-series-ac-servo-driver-manual-v24_i2652.html

Maybe you can send email or call the manufacturer of the machine.
They should have it.

Is there a label or name plate with detail model name and brand?

It looks like need to set the VFD's 10V voltage to match the maximum spindle speed of the controller, below is an example for your reference....

Para algunos controladores, es necesario cortar la alimentación y luego volver a encenderla.

Some motors need to do zeroing procedure after replacing a new encoder, don't if it is like your case, below is an example for your reference....

That type of the tool turret seems special, it rotates in horizontal, not vertical.

Maybe use a shaft coupling to connect?

Looks very nice!

Personally, I think the cimatron works pretty well, but since you're all set on replacing it, that means it's probably not a good fit for you.