Juniper MX2010 Hardware Manual page 42

Description" on page 100,
page 102, and "MX2000 AC Power Supply Module Description" on page
AC power requirements—Table 6 on page 16
delta and wye power feeds.
Table 6: AC PDM Delta and Wye Current Requirements
Three-Phase Voltage
200 V
(minimum–nominal)
(line-to-line) for delta (per
phase)
200 V
(minimum–nominal)
(line-to-neutral) for wye
(per phase)
NOTE: This is the minimum required to provide 2.5 KW per PSM. Based on facilities
guidelines, you should over-provision the MX2010 router. The two numbers listed in the
current columns reflect the distribution of phases from the feed to PSM. For example, from
one feed each phase goes to two PSMs and from other feed each phase goes to only one
PSM.
Power distribution modules (PDMs)—In the DC configuration, each system provides N+1 PSM redundancy
along with N+N feed redundancy. The power feeds from different sources need to be connected to
different PDMs. If feeds that connect to one PDM fail in a redundant configuration, the other feed starts
to provide full power.
NOTE: Depending on the voltage of the DC feeds, power can be drawn from both feeds.
The feed with higher voltage provides more power. If the difference between the voltages
is sufficient, then the higher voltage feed provides all the power. When the voltages are
exactly the same, equal power is drawn from both feeds.
A total of two PDMs can be installed into a router. Each DC PDM (-48 V) operates with up to nine
separate feeds of either 60-A or 80-A current limit. The capacity of these feeds is relayed to system
software through a switch located on the DC PDM. Each DC PDM (240 V China)—operates with nine
feeds each. The MX2010 router supports two types of three-phase power system PDMs. The three-phase
"MX2000 Three-Phase Wye AC Power Distribution Module Description" on
shows the MX2010 current requirements for the three-phase
Input Feed
1
2
1
2
107).
Current Delta per
Three-Phase PDM
50 A
25 A
–
–
Current Wye per
Three-Phase PDM
–
–
30 A
15 A
16