Netra[TM] 1290: Powering ON and Understanding its Standby Power Requirements (Doc ID 1019054.1)

Last updated on APRIL 06, 2021

Applies to:

Goal

The standby power budget for the N1290 is such that at least two PSUs must be connected to their power sources simultaneously. One PSU acting alone will not have sufficient standby power to support Fan#3 (which spins on detection of standby power) and will overload after an elapsed time of between four and ten seconds. The PSU will shutdown.

The discussion here will center around the behavior of the standby power of the Netra 1290 server. Standby power is the power supplied to the system by each of four PSUs when they are plugged in to an AC or DC source. This standby power is not controllable by software - it cannot be switched ON or OFF by command, only by action when the power leads are connected or disconnected. This document will focus on the correct timing required to connect each PSU to its power source in order for the system to successfully reach the lom prompt. If the N1290 cannot reach the lom prompt, it cannot be powered ON and so cannot be booted to the OS level.

Solution