[NE748]

Please help

I have an early 90's Fadal VMC40. I have been having issue with Z axis running rough moving up. When I send it home the Z goes all the way up and the X, Y doesn't move.

It gives me an emergency message. I jog the machine to home position then CS, it did not stay at home position.

I had to shut off and restart it seems to be ok.

Do you think my Z amplifier card is defective? Which card is the Z?

It also had a smelled like electronic burn.

[skywalker4]

be sure you are sending it home without any offsets.
try G0G28H0Z0. also if you jog it close to the cold start positions, did you do a setcs?
that resets the cold start position.
i really doubt that the card is bad.
i have seen people mess the z cold start position very often,
be thankful that it did not head towards the table, the night guy did that to me more than once.

[NE748]

Thank you

I'm not sure what it is beside the rough sound of the z axis during up travel, everything seems to be working fine.

[rodney247]

Is this machine a DC servo motors. You may want to check and change your brushes

[leorme]

check or adjust the encoder of the z axis (is on the top of the machine)
also change the position of the amplifier (the z is on the down position)
good luck