Power Supplies - Sun Microsystems Enterprise Tape Library 7/3500 Field Service Manual

Extension Motor Interface
The extension motor interface on the actuator driver PWA receives closed-loop low -
level analog current control commands from the robotics controller. This PWA
amplifies the command signal to provide a moderate current drive signal to the
extension brush motor.
Load Port Lockout Solenoid Interface
The load port lockout solenoid interface on the actuator driver PWA receives a low-
level enable control command from the robotics controller and, in turn, provides an
open loop pull-in and hold current to the load port solenoid.
Tape Drive Handle Motor Interface
The tape drive handle motor interface on the actuator driver PWA receives open
loop low level full-stepping current control command from the robotics controller
and amplifies the command signal to provide a moderate current two-phase drive
signal to the tape drive handle stepper motor. The tape drive handle motor drives
are multiplexed, therefore, only one motor can be driven at any one time.

Power Supplies

The library uses two different power supplies types which are located on the CEA.
Logic PC Power Supplies
Each logic PC power supply produces 326 watts with automatic ranging to a 115
± 12 VDC are used to
VAC or 230 VAC input at 50/60 Hz. Outputs of +5 VDC and
provide logic power for the library PWAs and the tape drives.
Motor Bus Power Supplies
Each motor bus power supply produces 110 watts with automatic ranging to 115
VAC or 230 VAC input at 50/60 Hz. The outputs of each power supply are
connected in series to provide +24 VDC and +48 VDC motor busses for the actuator
driver PWA (A2).
Chapter 1 Library Overview 9