Normal-Capacity Ac Power Supplies; High-Capacity Ac Power Supplies - Juniper MX960 Hardware Manual

MX960 3D Universal Edge Router Hardware Guide
Table 54: Minimum Number of Power Supplies Required for the MX960 (continued)
MX960 Normal-capacity AC

Normal-Capacity AC Power Supplies

High-Capacity AC Power Supplies

100
2
Normal-Capacity AC Power Supplies on page 100
High-Capacity AC Power Supplies on page 100
Understanding Input Mode Switch (DIP Switch) Settings on page 101
The MX960 can be powered by three normal-capacity AC power supplies (non-redundant
configuration) or four normal-capacity AC power supplies (redundant configuration). In
a non-redundant configuration, the three AC power supplies share power almost equally
within a fully-populated MX960 system. In a redundant configuration there is full power
redundancy meaning if one power supply fails or is removed, the remaining power supplies
instantly assume the entire electrical load without interruption and provide full power
for the maximum configuration for as long as the router is operational.
NOTE: Each normal-capacity power supply must be connected to a dedicated
AC power feed and a dedicated customer site circuit breaker. Juniper
recommends that you use a 15 A (250 VAC) minimum, or as required by local
code.
The MX960 can also be powered by two high-capacity AC power supplies. The
high-capacity power supplies must be installed in adjacent slots in the chassis. They can
operate in one-feed mode or two-feed mode. The maximum inrush current for a
high-capacity AC power supply is 38A per feed at 264VAC.
In one-feed mode, the power supplies output power at a reduced capacity (1700W). In
two-feed mode, the power supplies provide power at full capacity (4100W). To operate
the MX960 at full capacity, you must use two-feed mode. High-capacity power supplies
require one power cord per feed. Therefore, to operate the MX960 at full capacity, you
will need two power cords.
Each high-capacity AC power supply accepts two AC feeds in two unique AC receptacles
located on each power supply.
When using the high-capacity AC power supplies in one-feed mode, plug one end of the
power cord into the corresponding AC receptacle directly above the power supply in the
chassis and the other end into a DC outlet. When using the high-capacity power supply
in two-feed mode, you need two power cords. Plug one power cord into the AC receptacle
on the chassis and then plug the other end into a DC outlet. Next, plug the second power
cord into the AC receptacle on the AC power supply and plug the other end into a DC
outlet.
In high-capacity AC power supply configurations, there are two zones that provide power
to specific components in the MX system. No current sharing between power supplies
PWR-MX960-AC
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