Figure 72: Ac Pdm Three-Phase Delta Input Power; Table 62: Calculating Ac Power Budget - Juniper MX2020 Hardware Manual

MX2020 3D Universal Edge Router Hardware Guide
166

Table 62: Calculating AC Power Budget

Power
Distribution Typical Input
Module Power per PSM
Three-phase 2142 W
delta AC PDM (4
per
system)—50 A
feed (input #1),
and 25 A feed
(input #2)
Three-phase wye 2142 W
AC PDM (4 per
system)—30 A
feed (input #1),
and 15 A feed
(input #2)
To calculate necessary input power for three-phase delta AC PDM, follow the
3.
procedure below (see Figure 72 on page

Figure 72: AC PDM Three-Phase Delta Input Power

AC PS_0 AC PS_3
2800W 2800W
input
A1
B1
C1
AC PSM VIN=200-240 single phase:
Two AC PSMs are connected in parallel between two lines.
a.
Nominal value of input current for one AC PSM is 2800 W/200 V=14 A.
b.
Nominal input current for two AC PSMs is 2*14 A=28 A.
c.
Nominal value of line current is 28 A*√3=48.5 A.
d.
So, input #1 rated current is 50 A.
e.
Only one AC PSM is connected between two lines.
f.
Nominal value of input current for one AC PSM is 2800 W/200 V=14 A.
g.
Maximum
Input Power
per PSM
2800 W
2800 W
166).
AC PS_1 AC PS_4
2800W 2800W
input input input
AC PS_2
2800W
input
AC PS_5
2800W
input
Maximum Power Supply
Output Power Module
per PSM Efficiency
2500 W 91%
2500 W 91%
AC PS_6 AC PS_7
2800W 2800W
input input
AC PS_8
2800W
input
Copyright © 2015, Juniper Networks, Inc.
A2
B2
C2