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Introduction
The DC version of the IBM
power subsystem, which provides up to 470 Watts with -48 to -60 VDC input and with current and
remote sense regulation. The power subsystem consists of one or two 470-Watt power supply
modules. A system with two modules forms a redundant, hot-swappable (1+1) power subsystem.
Interface Requirements
DC Input
The DC power source may produce hazardous voltage levels exceeding -60 VDC and high energy
levels above 240VA that may cause electric shock or burns. All DC input connections should be
made only by a qualified service person to prevent injury. All wiring terminals connected to the
DC input terminal block must be fully insulated with no exposed bare metal.
DC Output Connectors
The power subsystem DC power and control signals are interfaced to the server system via wire
harnesses when the power supply modules are inserted into the power subsystem enclosure. The
safety ground pin of the power supply module is the first pin to connect and the last to disconnect
when the module is being inserted or removed from the power subsystem housing. In addition to
the 5-V Standby, -12 V, +3.3 V, +5 V and +12 VDC outputs, the following signals and output pins
are included:
•
+3.3 VDC remote sense
•
+5 VDC remote sense
•
+12 VDC remote sense
•
Remote sense return
•
Power Subsystem On (DC PWR enable)
•
Power Good
2
•
I
C interface chip
Power Supply Module LED Indicators
There is a single bi-color LED to indicate power supply status that is visible on the back of the
system. Table 7 shows the conditions confirmed by the LED indicators.
Table 7.
LED Indicators
Power Supply Condition
No DC power to all PSUs
No DC power to this PSU only
DC present/Only Standby Outputs On
Power supply DC outputs ON and OK
Current limit
Power supply failure (OTP, OCP, OVP, UV)
1
PS Failure, PS Presence, PS Predictive Fail, +12 V Mon, +5 V Mon, and the 5 V Standby rails failure are
being monitored via an I
26
®
xSeries 343 server uses a -48 to -60 VDC input switching
1
2
C interface chip.
Power Supply LED
OFF
AMBER
BLINK GREEN
GREEN
AMBER
AMBER
System Description
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