IBM 343 manual Interface Requirements, Power Supply Module LED Indicators

Introduction

The xSeries343 server system uses a -48 to -60 VDC input switching power subsystem, which provides up to 350 Watts with -48 to -60 VDC input and with current and remote sense regulation. The power subsystem consists of one or two 350-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 only 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 V DC 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

•I2C*

*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 I2C interface chip.

Power Supply Module LED Indicators

There is a single bi-color LED to indicate power supply status visible on the back of the system. Table 8 shows the conditions confirmed by the LED indicators.

Table 8. LED Indicators

Power Supply Condition	Power Supply LED
No DC power to all PSU	OFF
No DC power to this PSU only	AMBER
DC present / Only Standby Outputs On	BLINK GREEN
Power supply DC outputs ON and OK	GREEN
Power Supply in Alert Condition	BLINK AMBER
Power supply failure (OTP, OCP, OVP, UV)	AMBER

24 xSeries 343 Hardware Maintenance Manual