Can't win for losing

[dougputt]

Ok, so when I was trying to isolate my R2E3 x axis snag I have now completely muffed my Y axis.

Checked the brushes, checked the wiring at servo. Yes the fault stays with the servo.

As soon as I enable the drives, y axis starts rapid spin and kicks off.

See attached FIST report

[Al_The_Man]

If it is not the tach if you have one then it sounds like encoder?
Al.

[dougputt]

Hi Al

Swapped encoder and it works fine on other drive. Seems to be this servo. Not sure what is going on. Cleaned commutator on both the drive and the tach.

As soon as you enable the drive it starts spinning til it e stops in about .5 of a second

[John Bennett]

Y axis, tach is a 7 volt/1000rpm generated signal from servo. This signal goes to axis drive (contraves 400) on wire 317 (+) and 316 (-) which connect to terminal 4 and 5. The signal is also received on the ELI board on terminal K1-9 (+) and K1-10 (-). You could take a volt meter and enable drive to check that signal is getting to each of these points. The overflow is the fault showing that the amount of current to drive does not equal the rpm of the drive , -overdrive shows that it is less than expected.

[dougputt]

Apparently when I had motor apart I did not mark alignment correctly and I had to end up rotating case 90 deg

[Al_The_Man]

The tach is not positioned to the armature position, only polarity?
As mentioned, rotate the motor and see if the tach output exists, if it does, remove the analogue command signal if it runs aways with no signal input, then the tach circuit polarity or output is suspect.
Al.

[dougputt]

So now I am back to same old fault the X axis faults with misposition error on rapid travel in - direction only