Engineering
42
02/11 MN05006002Z-EN
Example for calculation of the voltage drop in the
device supply
Figure 6:
Example for calculation of the voltage drop in the
device supply
a
6 contactors DILM38 (with DIL-SWD-032-002),
simultaneity factor k = 0.8
b
2 SmartWire-DT I/O modules (EU5E-SWD-4D4D)
c
3 function elements M22-SWD-K11LED-W
d
Network termination (SWD4-RC8-10)
Total length of the ribbon cable: 8 m
Example of calculation using the formula:
EU5C-SWD-DP
I
G
1
2
3
4
5
6
7
8
9
10
11
a
a
a
a
a
a
b
b
c
c
c
d
1 m
10 cm
10 cm
10 cm
10 cm
10 cm
2.1 m
10 cm
4 m
10 cm
10 cm
10 cm
U
VP
= 14.
3
V
U
AUX
= 22.5 V
I
VP
= 0.
3
7 A
I
AUX
= 2.4 A
U
n
= U
n-1
- R
Ln
x (I
n
+ I
RB
)
Result of calculation
Total current in the device supply I
VP
0.364 A
Total current in the contactor supply I
AUX
2.4 A
Voltage drop in the device supply U
VP
0.38 V
Voltage drop in the contactor supply U
AUX
2.52 V
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