Juniper SRX 5800, Hardware Manual

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For a standard-capacity power supply, verify that the BREAKER ON and PWR OK LEDs are lit steadily.
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For a high-capacity power supply, verify that the DC OK LED is lit, and that the PS FAIL LED is not
lit.
Upgrading an SRX5800 Services Gateway from Standard-Capacity to
High-Capacity Power Supplies
You can replace the standard-capacity power supplies in the SRX5800 Services Gateway with either two
or four high-capacity power supplies of the same input type (AC or DC). Two high-capacity power supplies
provide adequate power for a fully loaded chassis; installing four high-capacity power supplies provides
redundancy in case one power supply in either zone fails. You do not need to power off the device to
upgrade to high-capacity power supplies.
NOTE: The services gateway cannot be powered from standard-capacity and high-capacity
power supplies simultaneously. The one exception is during the process of replacing
standard-capacity power supplies with high-capacity power supplies, when it is permissible to
have both types installed briefly.
CAUTION: The services gateway cannot be powered from AC and DC power supplies
simultaneously. The first type of power supply detected by the services gateway when
initially powered on determines the type of power supply allowed by the services
gateway. All installed power supplies of the other type are disabled by the services
gateway. If you install a power supply of the other type while the services gateway is
operating, the services gateway disables the power supply and generates an alarm.
The following procedures describe how to upgrade from standard-capacity power supplies to high-capacity
power supplies of the same input type (AC or DC) without interrupting power to the services gateway
components. Choose the procedure that matches your services gateway configuration:
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