Vaisala DMP248 Manual de servicio Pagina 30

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OPERATING MANUAL_______________________________________________________________
24 _____________________________________________________________________ U263EN-1.4
Connection to an AC supply
The DMP248 transmitter can also be connected to an AC supply
without an external rectifier. However, when more than one
transmitter is connected for example to one 24 VAC transformer, a
common loop is formed and there is an increased risk of a short-
circuit. To avoid this, always use separate floating supply for each
transmitter (see FIGURE 3-19A). However, if several transmitters have
to share one transformer, the phase () must always be connected to +
connector in each transmitter (see FIGURE 3-19 B).
24 VAC
Controller
shared
common
24 VAC
24 VAC
DMP248 transmitter Controller
B) COMMON LOOP FORMED -
NOT RECOMMENDED!
A) NO COMMON LOOP FORMED - RECOMMENDED
supply
voltage
signal
output
supply
voltage
signal
output
supply
voltage
supply
voltage
signal
output
signal
output
line
DMP248 transmitter
DMP248 transmitter
DMP248 transmitter
FIGURE 3-19 Connecting the transmitter to an AC supply.
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