Segment
Wire cross-section
[mm²]
Cable length
[m]
Voltage VDC
[V]
Current consumption of
connected devices [A]
1
0.75
15.00
23.38
0.00
2
0.75
15.00
22.80
0.00
…
14
0.75
15.00
18.96
0.00
15
0.75
15.00
18.89
0.00
Table 7: Example voltage drop on 15 Flexi Loop nodes with wire cross-section 0.75 mm²
Devices with current consumption
If devices with a current consumption are connected to the Flexi Loop node (in the
example with 0.5 A and with 1.5 A), the input voltage drops below the permissible value
from the 2
nd
Flexi Loop node.
Segment
Wire cross-section
[mm²]
Cable length
[m]
Voltage VDC
[V]
Current consumption of
connected devices [A]
1
0.34
15.00
20.00
0.50
2
0.34
15.00
16.86
1.50
3
0.34
15.00
16.14
0.00
…
10
0.34
15.00
13.42
0.00
Table 8: Example voltage drop due to current consumption of connected devices
Solution example with PWRI power supply accessory
By using a PWRI power supply accessory after the 5
th
Flexi Loop node, the input voltage
is adequate at all 10 Flexi Loop nodes.
Segment
Wire cross-sec‐
tion [mm²]
Cable length
[m]
Voltage VDC
[V]
Current consumption of con‐
nected devices [A]
1
0.34
15.00
23.02
0.50
2
0.34
15.00
22.12
1.50
…
5
0.34
15.00
17.07
0.00
FLA-PWRI
1
0.34
15.00
23.97
0.00
…
5
0.34
15.00
22.93
0.00
Table 9: Example voltage drop on 10 Flexi Loop nodes with PWRI
Solution example with increased wire cross-section
Using a wire cross-section of 0.75 mm² will ensure that a sufficient input voltage is
available even at the 10th Flexi Loop node.
DESIGN
4
8015836/YT10/2016-05-24 | SICK
O P E R A T I N G I N S T R U C T I O N S | Flexi Loop
33
Subject to change without notice
