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Recovery of Lost Fibers

The button sensing of the gripper will halt the positioning routine if there is a dropped fiber or one that it couldn't pick up. In most cases, the errant fiber can easily be recovered through use of the gripper TV camera.

The following steps should be used for simple fiber recovery.

• If the fiber is not visible in the gripper TV, try to view the errant fiber with

  view < fiber#>

  or by clicking the view button in the graphics window followed by a click on the fiber in trouble in the graphics display.
• If you can see that the fiber/button is displaced from the center of the gripper, type

  cruise  

  to move the gripper over the button with the H, J, K, L, or keys. Typing a 1 through 9 prior to each arrow key will scale the step size by a power of two scaling.

  Hit return when the fiber is centered in the gripper.

• The software now needs to know the corrected location of the lost fiber.

  Type

  thisis

  to update that position.

• Type

  park < fiber#>

  to see if the problem is cured by parking the troubled fiber.
• Rerun the setup command (or whatever action was being conducted) and all should proceed well.

If the lost fiber can not easily be found with the viewer, have trained personnel (the Observing Tech) go to the telescope and inspect the hardware. If they had to reset the lost fiber by hand, they will have placed it into its stow position. The software will have to be informed of this action with the following command.

xstowed < fiber#>

park < fiber#>

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