Juniper MX2020 Hardware Manual page 116

MX2020 3D Universal Edge Router Hardware Guide
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need to be connected to different PDMs. If feeds that connect to one PDM fail in a
redundant configuration, the other feed kicks in to provide full power. A total of four
PDMs can be installed into a router. Each DC PDM operates with up to nine separate
feeds of either 60-amp or 80-amp current limit . The capacity of these feeds is relayed
to system software through a switch located on the DC PDM.
DC PSMs—The DC PSMs are hot-removable and hot-insertable. The DC PSMs are a
dual redundant feed ( INP0
feeds from different sources that are used to provide feed redundancy when both input
feeds are present, power will be drawn from the feed supplying higher DC voltage.
These feeds are set by the input mode DIP switch located on the DC PSM (see
DC Power Supply Module Description" on page
subsystem capable of carrying nine feeds each. Connect feeds from one source to one
PDM and feeds from the other source to the second PDM of the power subsystem.
Each DC PSM is capable of delivering 2500 W of power if 80 A feeds are connected.
The maximum inrush current for a high-capacity DC power supply is 30A for 230ms.
AC power subsystem—The MX2020 supports connection of a three-phase AC power
system. There are two types of three-phase power systems: the three–phase delta
and three-phase wye. The AC power going to the PSMs is split into three individual
phases—each PSM works on a single phase. This means the power system works
independent of the kind of AC feed is connected. The user can connect one or two
feeds, depending on the power system configuration (number of PSMs, redundancy,
etc.). Each phase from each of the two feeds is distributed among one or two PSMs
(one feed has each phase going to two PSMs, and the other feed has each phase going
to a single PSM).
AC PDMs—The MX2020 supports connection of a three-phase AC power system. There
are two types of three-phase power systems. The three-phase delta and three-phase
wye. The AC power going to the PSMs is split into three individual phases (wye) or pair
of phases (delta). This means the power system works independent of the kind of AC
feed is connected. Each PDM requires two feeds connected—both are three-phase.
Each phase from each of the two feeds is distributed among one or two PSMs (one
feed has each phase going to two PSMs, and the other feed has each phase going to
a single PSM).
AC PSMs—The AC PSMs are hot-removable and hot-insertable. The AC PSMs have a
dual redundant feed ( INP0
feeds are set by the input mode DIP switch located on the AC PSM (see
Power Supply Module Description" on page
phase derived from either three-phase delta 200-240 VAC (line-to-line) or three-phase
wye 200-240 VAC (line-to-neutral). Each AC PSM is capable of delivering 2500 W of
power.
The maximum inrush current for a high-capacity AC power supply is 36A for half cycle.
The MX2020 router supports the power systems in
and INP1 ). Each DC PSM can be connected to two separate
96). There are two PDMs per power
and INP1 ). One input feed is active during operation. These
158). Each AC PSM works with a single
Table 30 on page
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"MX2020
"MX2020 AC
85.