Sun StorageTek SL8500 Modular Library System
 

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In this Document

Goal

Solution

Oracle Confidential PARTNER - Available to partners (SUN).
Reason: Confidential to Service Personnel Only

Applies to:

Goal

SL8500 Top Brush Track Scrubbing Procedure to address premature brush wear.

Instructions to clean copper rails in library.

Solution

DISPATCH INSTRUCTIONS
WHAT SKILLS DOES THE FIELD ENGINEER/ADMINISTRATOR NEED: Knowledge on SL8500 maintainence and service.

TIME ESTIMATE: 120 minutes

TASK COMPLEXITY: 2

FIELD ENGINEER/ADMINISTRATOR INSTRUCTIONS:
PROBLEM OVERVIEW: Backline Support has determined Rail Cleaning is required to resolve robotic issues.

WHAT STATE SHOULD THE SYSTEM BE IN TO BE READY TO PERFORM THE RESOLUTION ACTIVITY?:  Library system needs to be offline and powered off to perform this task.

WHAT ACTION DOES THE FIELD ENGINEER/ADMINISTRATOR NEED TO TAKE:

Refer to attached file for additional information and pictures (Nov 2016)

Background on Brush Assembly Issue

The SL8500 uses the brush assembly for PLC_Power Line Communication. The robotic assembly uses the associated copper rails for power and communication between the Library Controller and the Handbots. When the brushes wear beyond specification it can lead to power and communication issues noted in the log as result_code_5051; "A low voltage condition has been detected on the servo motor power" and error_code_1301, "Device response time-out". These are symptoms associated with the issue but there is no specific error code denoting premature brush wear and additional error codes have been reported. Error codes 5051 and 1301 can also be caused by other issues not related to premature brush wear. If assistance is needed in the log analyses open an issue to the TSC.

Visual inspection can be used to verify the condition

-Excessive debris build-up at the 4 copper joints in between the copper rail segments at columns_7, 2, -2, and -7. Also some brush debris build-up is common in all the columns in front of the drives and at the end of the rail in front of the elevator.

Note: Burnishing of the copper rails by the brushes is expected denoting some discoloration. Excessive debris in this context would be unusually high amounts of loose debris dark-grayish in color due to the premature wearing of the brushes which is made out of a graphite composite.

Tools Needed:
1.Non-woven abrasive pads; recommendations:

NOTE:(Mar-2018) According to engineering, use of the scotchbrite pad is no longer recommended as wears the copper off the rails. Recommended to use a lint free cloth with the alcohol.
  -Scotch-Brite™ General Purpose Hand Pad 7447
   -Scotch-Brite™ Production Hand Pad 8447
   -Scotch-Brite™ Hand Pad 96 Unprinted, 015373A, 60 pads per case

   -Norton 6” X 9” Bear-Tex Hand Pads #796; order number_NOR 66261079600
2. Alcohol Wipes
3. Vacuum Cleaner with hepa filter
4. Dental Mirror
5. Lint free cotton clothes

Optional Tools:
SL8500 Array Extraction Tool P/N 24100275
Copper Rail Clip Extraction Tool P/N 313921002
Optional Parts:
Power Rail Jumper Connector P/N 313885502 <white connector>
Retaining Clip P/N 313917001 <black rail separator clip>

Non-Disruptive Inspection Procedure:

1. Activate the SSD and wait for the Enter LED to illuminate

2. Open the library front access door on that side and look for unexpected debris on the copper rails, example pasted below

3. Close the library front access door

4. Return SSD to center

5. Wait for robots to complete initialization before activating the SSD to the other side.

6. Wait for Enter LED to illuminate

7. Open the library front access door on that side and look for unexpected debris on the copper rail

8. Close the library front access door

9. Return SSD to center.

Disruptive Inspection Procedure Note: Use sparingly, the non-disruptive procedure should be adequate in the vast majority of cases.

-Take library offline from host operations for approximately 20 minutes.

-Open front library access door.

-Inspect corner track assembly in the RIM (example below).

Note any unexpected debris build-up at the 4 copper joints in between the copper rail segments at columns_7, 2, -2, and -7.

The medium to dark brown film left on the copper rail is normal. Excessive debris in this context would be unusually high amounts of loose debris dark gray to black in color due to the premature wearing of the brushes which is made out of a graphite composite.

Cleaning Procedure:
1. Remove loose debris between joints of the copper conductors on each rail and inspect for sharp edges.

   a. Locate the four copper conductor joints on each near columns -7, -2, 2, & 7. Run a finger along the joint to inspect for sharp edges. If found, follow the instruction in step 1e. Conductor ends are rounded/chamfered at the factory and generally do not require rework.

   b. Remove the 4 black rail separator clips, which retain the white power rail jumper connectors using a clip extraction tool if available. It may be necessary to remove the arrays directly below columns -7 and +7 to improve access.

   c. Push the white connector back out of the way to gain access to the joint. (It is not necessary to completely remove the white connector.)

   d. Remove any loose debris between the joints using a vacuum.

   e. ONLY IF NECESSARY. Gently break the sharp edge utilizing sandpaper or a jeweler’s file. Radius no more than .010” (.25mm). For reference, the copper conductor thickness is .03” (.75mm).

2. Vacuum all loose debris from the tops of the arrays, aluminum rail extrusions, rail separator clips, and copper conductor assemblies. Use a mirror to view the top of rail 1 as required.
3. Use alcohol wipes to remove any remaining debris from the copper conductors and aluminum rail extrusions. Debris build up is commonly seen around the drives and elevator assemblies.
4. Wipe down the copper rails with lint free cloth.
5. Reinstall the black retaining clip and white connector.
6. Re-inspect any sharp joints found in step 1a and address as necessary.

OBTAIN CUSTOMER ACCEPTANCE:
WHAT ACTION DOES THE FIELD ENGINEER/ADMINISTRATOR NEED TO TAKE TO RETURN THE SYSTEM TO AN OPERATIONAL STATE:  Library must be powered on, IPL'd and brought online to customer.

PARTS NOTE: Noted in instructions.

REFERENCE INFORMATION: NA

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