Yes its an old thread but a followup and a repeat of good service.
When the above motor/encoder was installed I had already switched the working X axis motor to the Y to eliminate a possibility of anything that wasn't the motor causing the problem.
After the 2012 repair I had the rebuilt motor on the X axis and the original X axis motor on the Y axis.
Within the last year I was having to do the "P" "CAN" at startup to allow Y axis to home.
Early August 2020 and that and changing par 701 wouldn't allow the Y axis to home.
Checked all the "easy" things, and decided to swap out the X axis motor (8 year old rebuild) into the Y axis location.
It worked , but the original Y axis motor in X gave same errors.
Called Servotech and got a "worse case scenario price" for a rebuild, bit the bullet and sent the motor in for repair.
Encoder diagnosed as non repairable and the rebuild involved a modification to use a new non-tapered mount encoder, bearings and power socket .
The motor was back in about a week(I had not paid for rush service).
As before the motor looked like new.
Installed the motor in the X axis without issue and everything worked fine with homing the machine.
Shut it down and started it up several times and then ran a warm up program that loops until reset .
After about 15 minutes as I was in the other end of the shop I heard the spindle stop.
Look at the monitor and error 414,424 & 434 oh crap.
My first thought was the newly rebuilt motor.
Tried restarting, no change.
Called Servotech and worked with Mike the owner.
Thru some basic diagnostic tests with an ohm meter and removing motors from the system I found it was the Y axis motor.
Since the error went away when the power connection was disconnected from the Y axis motor, Mike felt that it was possible there was a winding issue that I couldn't detect with the equipment I had.
Since the error code went away but the cable from the servo amplifier was still connected, that cable should be fine.
What it turned out being was the power connector (machine side ) to the Y axis motor.
The bakelite was decomposing allowing 2 of the female pins to move back when the connection was made.
Upon taking the fitting apart, the back half had signs of coolant.
I installed a new connector, luckily having enough extra cable to to give a clean end and now the machine has been running all week without an issue.
I'm a 1 man shop and was treated like one of the big guys.
Thanks Servotech.
mike