IBM #1900 Redundant Power Supply for 3576 TS3310 Tape Library

IBM feature #1900 is the redundant power supply option for the IBM System Storage TS3310 Tape Library, machine type 3576. The library supports single and redundant power configurations, and every module needs at least one power supply. A single configuration has one AC line input and one DC power supply in the left slot of each module, and the redundant configuration has dual AC line inputs and power supplies in both slots of each library module.

Each supply in a control module and in an expansion module has its own AC line cord. During redundant operation each supply carries one-half of the power load, and if a line cord or supply fails the second supply carries the complete load. The redundant supplies can be hot swapped without interrupting library operation, and a redundant supply can be hot added later to a library installed with one supply and a covered second slot.

Each supply carries a power switch that removes all power from the library for emergency and service situations. Three LEDs sit to the right of the switch: green for AC OK, green for DC OK and blue for a fault. A power supply weighs 1.814 kg (4.0 lb), and two thumb screws and a handle secure and release each supply.