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Load Port Lockout Solenoid
The load port lockout solenoid is located on top of the load port assembly. When the
load port lockout solenoid is actuated, the solenoid plunger is raised, unlocking the
load port mechanism, enabling the load port to slide freely open or closed. The load
port solenoid is immediately disengaged by the robotics controller, after the load
port mechanism moves off either limit switch, to enable the load port solenoid
plunger to fall back into a lockout point when the load port mechanism reaches an
open or closed position.
Tape Drive Assembly
A tape drive assembly consists of a tape drive, handle drive assembly (including the
stepper motor), and tape drive interface PWA mounted on a tape drive tray. There
can be up to seven tape drive assemblies in a library.
Tape Drives
When viewed from the left-side of the library, up to seven SCSI tape drives are
located in the front of the library just below the load port assembly. On the rear of
each tape drive is a tape drive interface PWA.
Handle Drive Assembly
A stepper motor assembly is mounted on the right side of each tape drive that is
used to electromechanically open and close the tape drive door. The handle stepper
motor is a two-phase stepper motor, which has 0.68 degrees per step resolution at
the tape drive door.
Tape Drive Interface PWA
The tape drive interface PWA plugs into the rear of each tape drive. It acts as an
interconnect/distribution point for RS-422 control/status and SCSI ID settings from
the robotics controller, +5V and +12V from the logic power supply, tape drive handle
door closed sensor inputs to the robotics controller, and handle stepper motor drives
from the actuator driver. This aids in minimizing cabling to each tape drive.
The tape drive interface PWA allows for convenient bussing and configuration of the
tape drives to external SCSI hosts. Each tape drive can be installed on the same or
different busses by using jumper cables between the PWAs.
20
Sun Enterprise Tape Library 7/3500 Field Service Manual • July 1997
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