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The power supply is packaged in a metal housing for structural and safety purposes. The power supply
converts AC input to +12 V DC and +5 V DC, and provides DC power to the 3592 through a separate
(removable) cable that connects to the drive canister FRU.
The 3592 DC power supply is
• A single FRU
• Hot-pluggable
The power supply has
• Over-voltage circuits
• Over-current circuits
• Thermal protection circuits
• Under-voltage detection
• Fan to provide cooling air
• No adjustments
• No serviceable components
The operational status of the power supply is indicated by three LEDs that are in the rear cover of the
power supply. Item
OFF, unless a supply fault occurs (in which case the ! LED turns ON).
One power supply can provide power to two drive canisters, if required.
Power switch and power sequence
The DC power supplies do not include power switches.
• Power can be removed from each power supply by removing the AC power cord (
supply.
• When AC power is first applied, an AC LED (
• When DC voltages are generated, a DC LED (
• If AC or DC power is lost, one or both of the LEDs (
• During power sequencing, power on self-test (POST) runs diagnostic tests to verify the operation of
memory, sensors, and electronic circuits.
A description of the power-on sequence follows.
1. When the 3592 power cord (
power supply goes ON.
2. About 1 - 2 seconds after power is applied, the following steps occur:
• The DC LED (
• The cooling fans begin operating.
Power cords
Power cords consist of an AC power cord
supplies that are connected to one or two 3592 drive canisters. DC power to the drive is delivered through
a quick connect/disconnect connector that mates with the drive.
The cable connects to one supply in the left enclosure and one supply in the right enclosure. Each cable
per cable pair also connects to a different circuit breaker on the PCC. This feature eliminates a single point
of failure within a frame.
Power specifications
The 3592 power supply accepts a single phase 50 or 60 Hz, ±5%, 100-127 or 200-240V AC (nominal)
voltage source. The DC voltages generated are 5V dc±10% and 12V dc±10%.
34 IBM 3592 TS1140, TS1150, TS1155, and TS1160 Tape Drives: Maintenance Information
6
is the DC LED and Item
1
) is plugged into the power source, the AC LED (
6
) goes ON and remains ON.
3
7
is the AC LED. The third ! (Attention) LED (
7
) lights.
6
) lights.
7
) and (
6
) turn OFF.
that runs from one 110/220 V AC outlet to 2 DC power
8
) is always
1
) from the DC power
7
) on the back of the
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