Emerson PACSystems RSTi-EP - Example Calculation for the Current Demand (All Current Values in Amps)

User Manual Section 3
GFK-2958L May 2021
Configuration 32
Module 11 (without power refresh):
I = 8.19 A + (0.015 A + (0.5 A x 4) = 10.205 A
Therefore, the available 10 A would be exceeded. As a result, an EP-7641 power supply
module must be positioned as the 11
th
module, which will supply the required power to the
subsequent modules after the power feed module. Unused current values may not be
included.
Module 11 (as per PF-O):
I = (0.015 A + (0.5 A x 4) = 2.015 A
Module 12 (as per PF-O):
I = 2.015 A (0.015 A + (0.5 A x 4) = 4.030 A
3.7 Example Calculation for the Current Demand
(all Current Values in Amps)
Module
no.
Part
number
I
SYS
I
IN
I
OUT
I
S
I
L
Simultaneity
factor
g
Cumulative
current
demands of
the input
current path
Cumulative
current
demand of the
output power
path network
adapter
Cumulative
current
demand of
the EP-7641
output power
path
EPXPNS00
1
0.116
0.116
0
1
EP-1214
0.008
0.018
0.06
1.0
0.202
0
2
EP-1214
0.008
0.018
0.06
1.0
0.288
0
3
EP-1214
0.008
0.018
0.12
1.0
0.434
0
4
EP-1214
0.008
0.018
0.18
1.0
0.640
0
5
EP-2218
0.008
0.035
2.0
0.5
0.648
1.035
6
EP-2218
0.008
0.035
4.0
0.5
0.656
3.070
7
EP-2218
0.008
0.035
3.0
0.5
0.664
4.605
8
EP-2218
0.008
0.035
2.0
0.5
0.672
5.640
9
EP-2218
0.008
0.035
1.2
0.5
0.680
6.275
10
EP-2218
0.008
0.035
4.0
0.5
0.688
8.290
EP-7641
11
EP-2218
0.008
0.035
4.0
0.5
0.696
2.035
12
EP-2218
0.008
0.035
4.0
0.5
0.700
4.070
I
SYS
I
IN
Current consumption from the system power supply
Power consumption from input current path