Sun StorageTek SL8500 Modular Library System
 

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Applies to:

Symptoms

Track motors are being damage
Track motors are over heating
Track damage

Changes

{CHANGE}

Cause

Track and STrack Motors may be damaged while running exclusively in the corners with SL8500 exerciser Routines.

Solution

Resolution
Engineering recommends no excessive diagnostic tests for an extensive period of time that keeps the Sbot exclusively in the corner section of library, columns 3 to 6. Do not recommend corner rail diagnostics be looped more than 10 minutes or 50 loops.

Additional Information
In the SL8500 support documents labeled "StreamLine SL8500 Modular Library System CSE Operational Checklist" and the "StreamLine Modular Library Systems Survival Guide" there are descriptions of Random Exerciser Test (RME) to be run during the initial install and testing of an SL8500. One of the tests labeled "Curved Rail Sections" will be removed or modified because of the potential of overheating the track motors.

There has been continued improvement in the SL8500 microcode to better handle high corner track activity but we still have some exposure to excessive motor heat build up that can impact library operations. The two SL8500 motors impacted are the Track and STrack Motors.

Extended testing of a PTP during installation testing that does not include a move out of the corner periodically could also overheat the track motors. Engineering recommends a move out of the corner, i.e. move from column 14 to the PTP, if extended PTP testing is required.

This change in the recommended install diagnostic routine is due to in-house testing and investigations performed by Library Engineering. This exposure does not typically occur during normal customer operations due to delays usually associated with corner gets and puts, i.e. get from a cell in column 6 to a drive or a get from a PTP to drive.

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