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.
Cables should be inspected and verified to be slack within the cable wrap. Overtension, or excessive slack can cause cables to bind and become damaged.
Cables and cable wrap should be cleaned on Preventive Maintenance (PM).
Bill changed mount cable wrap. Coude wrap should be changed to match. Can someone provide more detail?
There is a Cable Wrap auto-greaser near the ladder.
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.
Encoder heads are mounted at 90° intervals.
Runout of the Coude tower can be calculated by measuring the difference in counts between two encoders opposite each other.
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.
We need to locate this procedure.
If encoder tape must be replaced:
There's an installation fixture and procedure. We need to locate them.
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.
We can collect and log accelerometer data
We need the subnet connection info.
There’s a lightning detector near mezzanine door.
Battery is dead, needs to be replaced.
Crane at clean room door is is supported from overhead. It is connected to the Coude and to the enclosure. This transmits vibration from Enclosure to Coude.
Crane mount needs to be modified to not connect to the Enclosure.
Utility level
Cable wrap
Dust causes cables to bind.
Cables need to be cleaned on PM. Cables need cleaning.
Delta chain has excess slack. Needs to be fixed. See photo.
Air knife is vibration concern
Enclosure cable wrap rollers can rust and sieze. Causes dragging and vibration. Can detect by seeing scratches on the wrap bed.
Need to inspect cable wrap rollers on PM.
Need to inspect truck rollers on PM.
Cables and slots need to be cleaned on PM.
There's a Heidenhain alignment fixture and unit somewhere.
There's a procedure to align mount motor gear to the drive wheel somewhere. Also must adjust commutation of the drive.
Telescope level
Cooler cabinet hard bolted to deck without vibration isolation.
Mount has multi position locking pins. 2 pin positions, check for balance before removing pin.
Shutter crawlers should be greased on PM.
Enclosure azimuth lightning brushes resistance should be checked on PM.