Limaco ULM-31-HF, Руководство по эксплуатации и установке

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ULM.0.01.000RE_10_08_20
5.5 Power supply
It is recommended to use the stabilized DC power supply with the output voltage of
В
ИП
U 36 24


. It is allowed to connect multiple level transmitters to the same
power supply.
Power supply must provide load current output based on
А
3 . 0 per level transmitter:
n
ИП
I
 
3 . 0 ,
where
n
– number of level transmitters connected to the power supply.
Supply power must be of at least
ИП
I
ИП
U
ИП
P
 
.
Fig. 5.9 Level transmitter to power supply connection diagram
In case of long power supply line, voltage drop in the supply leads should be taken
into account. Maximum permissible length (in meters) of the feeder cable is calcu-
lated according to following formula
). 20 ( 24 . 95
 
ип
U
кд
S
кд
l
where
кд
S is single power wire cross-section in mm2, and
ип
U is power supply
voltage.
The table below presents results of calculation of maximum length of level
transmitter power cable for the most common wire cross-sections and power supply
output voltage of 24-28V.