[kla64]

1995 fadal 4020.
Cnc would not power up. Checked DC power supply. 110v in nothing out.
Swapped relay on power supply. No change.
Ordered ele-1071.
Swapped out old 1220-something with the ele-1071.

Throw the breaker, hit the cnc power on button, all 3 axis run away, on plus.

Had to throw the breaker to stop.

Pictures of before wiring and after.

Any suggestions?

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[awerby]

Usually when an axis runs away, it's because the servos aren't getting a signal from the encoders. The encoders are what tell the motor where it is; without them, it's just a motor - if you give it power, it spins.

[kla64]

Had someone out to trouble shoot today. Found that the 1030-1c board was dragging down the 12 volt to -1/2 volt, and +4 volts.

He removed the module responsible for rs232 from the 1030-1c board, put the board back in, and machine started and ran normally.

Once that component on the board is replaced, we should be all set.

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[kla64]

Ok. So had to send the 1030-1c out for repair. 3 components were replaced on the board. When testing the rs232 connections, they also found a bad rs232 selector switch with grounding problem. Problems solved.

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