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Check all the encoders, encoder interpolators, and encoder cables.
Check that the drive is mechanically aligned, smooth, no slop/slipping etc.
Let service know when the faults occur, of particular interest:
Only during initialization/volume calibration
Only in certain areas of the volume
Only near the limits
Only on long moves
Only on short moves
Only while using touch probe
Only when the touch probe touches the part
Only while using the pendant/on-screen joystick
Only when using rapid mode
Only after the machine has been running a long time
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Axis Hardly Moves at All or Does not Resist Pushing
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Check that the rotary encoder is properly connected and aligned to the motor shaft.
Check that there are no loose components in the drive. A loose coupling can drive the machine slowly but not quickly.
Check the encoder scopes in MotorScope to make sure they count as expected as the stage is pushed around.
If an encoder counts faster in one direction than the other, it is very likely a bad encoder cable.
If pushing one axis causes counts to change on another, it is very likely a bad cable on the axis not being moved.
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Fault after Grinding or Whirring Sound in the Motor
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This can be caused by the machine touching the hard stops because they are too close to the encoder limits, and is especially likely on Vertex machines. Move the encoder limits away from the hardstops.
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