MODULE POWER REQUIREMENTS
SIZING THE MODULAR POWER SYSTEM
I-E96-506B1 B - 9
dancy, add 1 to the value of QS. The IEPAS02 can supply all
the system voltages.
System Calculation Example Using IEPAS02 and IEPAF02 Modules
Assume that the current requirements for a set of modules
residing in a system cabinet has been calculated.
Additionally, the current requirement for 24 VDC I/O power
was calculated. The results are:
A
= 26.5 A (5 VDC current requirement)
B
= 16 A (24 VDC and associated I/O current requirement)
C
= 0.9 A (+15 VDC current requirement)
D
= 0.4 A (-15 VDC current requirement)
Substitute these values into the equation and solve for Q.
QN
= Largest of Q1, Q2, Q3, Q4 and Q5 = 4.39
Round QN up to the next highest integer.
QN
= 5
PS
= (
A
×
5.225) + (
C
×
15.3) + (
D
×
15.3)
= (26.5
×
5.225) + (0.9
×
15.3) + (0.4
×
15.3) = 158.35
PF = B
×
25.8 = (16
×
25.8) = 412.8
(if Q6 > 92 then set Q6 = 92)
= 47.44
QS
= Largest of Q1, Q3, Q4 and Q7 = 3.33
Q1
26.5
13
-----------
2.038
==
Q2
16
4
------
4
==
Q3
0.9
0.8
--------
1.125
==
Q4
0.4
0.8
--------
0.5
==
Q5
26.5 5.225
×〈〉
16 25.8
×〈〉
0.9 15.3
×〈〉
0.4 15.3
+〈〉++ +
130
--------------------------------------------------------------------------------------------------------------------------------------------------------
4.39
==
Q6
130
PF
QN
---------
130
412.8
5
---------------–=–=
Q7
PS
Q6
--------
158.35
47.44
------------------
3.33
== =
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