Engineering
36
02/11 MN05006002Z-EN
Example:
With an utilization factor k = 0.6, 10 contactors of the part
no. DILM38 can be supplied by an SmartWire-DT gateway or
an SmartWire-DT power feeder module.
Voltage Drop
Extensive SmartWire-DT networks with long line lengths (up
to 600 m) and the line resistance resulting from these lead
to a corresponding voltage drop on the device and contactor
supply lines.
For the planned network position of an SmartWire-DT slave
it therefore has to be checked whether sufficient supply volt-
ages are available there.
If the sum of all voltage drops is so large that the device elec-
tronics no longer function stably or a contactor no longer
switches definitely, insert an additional supply unit before
this network position.
Table 9:
Line resistance of the SmartWire-DT ribbon cable and
round cable
Because of the differing cable resistance values, calculate
the voltage drop for the SmartWire-DT ribbon cable and the
round cable separately.
h
The voltage drop of the devices and the current load in the
contactor supply are calculated automatically by the
design software SWD-Assist.
Cable resistance R
L
per m
for 15 V DC device supply
Cable resistance R
L
per m
for 24 V DC device supply
[
O
/m]
[
O
/m]
Flat band conductor
0.131
0.174
Round conductor
0.06
0.07
The line resistance per meter (calculated from the supply and return line) applies at a cable tempera-
ture of 70 °C.
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