Ground Floor
Vibration isolation is critical. Look out for a report any crossover connection between the enclosure and Coude or Mount.
Coude Cable Wrap
Coude Cable wrap has 2 cables in one slot. If the cables get dirty they can bind and not slip within the cable wrap slot.
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Grease and greasing operation should be inspected and verified on PM.
Coude Wrap Delta Chain
There is a Delta Chain section between the Coude tower and cable wrap to prevent tension relief if the Cable Wrap does not synchronize with Coude tower position .
Cables and cable wrap in the Delta Chain should be cleaned, inspected and verified to be slack within the cable wrap.
Operation of the Delta Chain should be tested and verified on PM.
Coude Encoders
There is an encoder tape around the Coude. It is scaled to report position within 40 microns. There are 4 coude encoder tape reading heads. The encoder is interpolated by 4096 (or 8192?) so reads to around 5 or 10nm.
Encoder heads are mounted at 90° intervals.
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We can add logic to the controller calculate runout. This data can be logged to monitor performance and accuracy of the Coude mechanical rotating assembly
Encoder tape should be inspected and cleaned on PM. This requires removing the tape covers.
The procedure is somewhere in our documentation. We need to locate this procedure.
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There's an installation fixture and procedure. We need to locate themboth.
Installation of new tape requires some rollers. Heidenhain will loan rollers for tape installation.
Coude Accelerometers
Qty (4) 3 axis Accelerometers are installed on the Coude. They are connected to a Data Acquisition System in Rack 6. The DAS is networked to a switch. There's another one on the mount.
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Crane mount needs to be modified to not connect to the Enclosure.
Utility level cable wrap
Dust causes cables to bind.
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Cables need to be adjusted.
Air Knife
Air knife is vibration concerna source of vibration.
Air knife cabinet is on the telescope side so may be a problem.
Enclosure cable wrap
Enclosure cable wrap rollers can rust and seize. Causes dragging and vibration. Can detect by seeing scratches on the wrap bed.
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Need to locate the alignment procedure.
Telescope level
Cooler cabinet is hard bolted to deck.
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