Technical Documentation
SRX5800 Services Gateway High-Capacity AC Power Supply
High-capacity AC power supplies provide a maximum of 4100 W of power each. Two high-capacity power supplies are required, and you can install four high-capacity power supplies for redundancy. Each high-capacity AC power supply has two corresponding AC appliance inlets: one located in the chassis directly above the power supply and one located near the top edge of the power supply itself. For each power supply, you connect one power cord to the inlet on the chassis above the power supply and one power cord to the inlet on the power supply itself. Each inlet you connect requires a dedicated AC power feed and a dedicated 15 A (250 VAC) circuit breaker.
 | Note: The services gateway cannot be powered from standard-capacity and high-capacity AC power supplies simultaneously. The one exception is during the process of replacing standard-capacity AC power supplies with high-capacity AC power supplies, when it is permissible to have both types installed briefly. |
| Note: The high-capacity power supply will operate with only one of its two AC inlets connected to an AC power feed. However, its DC output will be limited to a maximum of 1700 W. We recommend that you connect two AC power feeds to each high-capacity AC power supply. |
| Note: The services gateway must be running Junos OS Release 10.4 or later in order to use high-capacity power supplies. |
Each high-capacity AC power supply has an input mode switch, covered by a small metal plate. The input mode switch tells the system the number of AC power feeds it should expect. The input mode switch settings are described in Table 1. The default setting is 1.
Table 1: High-Capacity AC Power Supply Input Mode Switch Settings
Mode Switch Setting | AC Inputs | Result |
|---|---|---|
1 | Both AC inlets powered | DC output of 4100 W DC OK LED lights |
Only one AC inlet powered | DC output of 1700 W DC OK LED lights | |
0 | Both AC inlets powered | DC output of 4100 W DC OK LED lights |
Only one AC inlet powered | DC output disabled DC OK LED unlit |
| Note: We recommend that you set the input mode switch to 1 and connect two AC input feeds to each high-capacity AC power supply. |
 | Warning: The services gateway is pluggable type A equipment installed in a restricted-access location. It has a separate protective earthing terminal (the left pair is sized for M6 bolts, and the right pair is sized for UNC 1/4-20 ground lugs) provided on the chassis in addition to the grounding pin of the power supply cord. This separate protective earth terminal must be permanently connected to earth. |
Figure 1: High-Capacity AC Power Supply
