Figure 156: Ac Pdm Three-Phase Delta Input Power - Juniper MX2020 Hardware Manual

MX2020 3D Universal Edge Router Hardware Guide
378
Table 61: Calculating AC Power Budget (continued)
Power Distribution Maximum Input
Module Power per PSM
Three-phase wye AC 2800W
PDM (4 per
system)—30A feed
(input #1), and 15A feed
(input #2)
To calculate necessary input power for three-phase delta AC PDM, follow the
3.
procedure below (see Figure 156 on page

Figure 156: 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 2800W/200V=14A.
b.
Nominal input current for two AC PSMs is 2*14A=28A.
c.
Nominal value of line current is 28A*√3=48.5A.
d.
So, input #1 rated current is 50A.
e.
Only one AC PSM is connected between two lines.
f.
Nominal value of input current for one AC PSM is 2800W/200V=14A.
g.
Nominal value of line current is 14A*√3=24.5A.
h.
Current rating for input #2 is 25A.
i.
To calculate necessary input power for three-phase wye AC PDM, follow the procedure
4.
below (see Figure 157 on page
Maximum Output
Power per PSM
2500W
378).
AC PS_1 AC PS_4
2800W 2800W
input input input
AC PS_2
2800W
input
AC PS_5
2800W
input
379).
Power Supply Module
Efficiency
91%
AC PS_6 AC PS_7
2800W 2800W
input input
AC PS_8
2800W
input
Copyright © 2013, Juniper Networks, Inc.
A2
B2
C2