SYS POWER SUPPLY UM E
3.10
Rating of the AC Low Voltage Supply Line
For one-phase systems (with p = U · I · cos ? ) according to formula [2] there is:
U A
1~
u [%] =
200 p
2
=
200 I
U
cos
A
[3]
For three-phase systems (with p = √ 3 U · I · cos ? ) according to formula [2] there is:
U A
3~
u [%] =
100 p
2
=
100
U
3 I
A
cos
[4]
All formulaic symbols are defined in section 3.9, "Layout of 24 V DC Supply Cables
cos ? = power factor of the power supply unit
Example
A three-phase QUINT POWER 20 A/ 3 · 400V power supply unit is connected to a free
output of a distribution box via a 75 m (246 ft.) copper cable with A = 2.5 mm 2 (14 AWG).
A voltage of U L ? = 3 · 400 V AC is measured at the distribution box.
How high is the AC voltage at the input of the power supply unit?
L1
L2
U A D = 400 V AC
L3
N
PE
= 75 m
A = 2.5 mm (Cu)
2
U L D = ?
L 1 L 2 L 3 PE
5598D027
Figure 3-24
TN-S network
According to formula [4] there is:
2.5 mm
57
3~
u[%] =
100
400 V
3 1.4 A
2
0.7
m
mm 2
75 m = 0.22%
The AC input voltage across the power supply unit is
U L ? = 3 · 400 V · (1-0.0022) = 3 · 399.2 V.
3-34
PHOENIX CONTACT
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