Engineering
38
02/11 MN05006002Z-EN
Calculation of the voltage drop in the device supply
The operability of an SmartWire-DT slave is guaranteed at a
supply voltage U
VP
for the devices in the range of +15 V DC
(tolerance range -30 %/+20 %), i.e. +10.50 - +18.0 V DC.
The following is valid: U
VPmin
= 10.5 V DC
For safety reasons assume a supply voltage U
VP
= 14.5 V DC
on the supply unit for the calculation of the voltage drop.
The maximum voltage drop U
Lmax
is calculated as follows:
In the following calculation of the supply voltage a maximum
electrical load with an utilization factor of 1 is assumed.
i
Warning!
If the voltage drops below the minimum voltage, the safe
operation of an SmartWire-DT slave is no longer guaran-
teed.
U
Lmax
= U
VP
- U
VPmin
= 14.5 V - 10.5 V = 4.0 V DC
h
Rule-of-thumb value:
if you use only ribbon cables and
the maximum current of 0.7 A is consumed, the maximum
voltage drop in the device supply is achieved at a line
length of approx. 43 m, even with an unfavourable layout.
An unfavourable layout exists, if the first SmartWire-DT
slave is switched on after 43 m of ribbon cable.
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