Figure 73: Ac Pdm Three-Phase Wye Input Power - Juniper MX2020 Hardware Manual

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Nominal value of line current is 14 A*√3=24.5 A.
h.
Current rating for input #2 is 25 A.
i.
To calculate necessary input power for three-phase wye AC PDM, follow the procedure
4.
below (see Figure 73 on page

Figure 73: AC PDM Three-Phase Wye Input Power

AC PS_0
2800W
input
NE1
A1
B1
C1
AC PSM VIN=200-240 single phase:
Two AC PSMs are connected in parallel between two lines and neutral.
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.
d.
So, input #1 rated current is 28 A.
e.
Only one AC PSM is connected between two lines and neutral.
f.
Nominal value of input current for one AC PSM is 2800 W/200 V=14 A.
g.
Nominal value of line current is 14 A.
h.
Current rating for input #2 is 14 A.
i.
Calculate thermal output (BTUs). Multiply the input power requirement (in watts) by
5.
3.41 as shown in Table 63 on page
Chapter 13: AC Power Requirements, Specifications, and Guidelines
167).
AC PS_1 AC PS_4
2800W 2800W
input input
AC PS_3 AC PS_2 AC PS_5 AC PS_6
2800W 2800W 2800W 2800W
input input input
168.
AC PS_7
2800W
input
AC PS_8
2800W
input input
NE2
A2
B2
C2
167