Vaisala PTU300 Guia do Utilizador Página 37

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Chapter 3 _______________________________________________________________ Installation
VAISALA _______________________________________________________________________ 35
Connections to 24 VAC Power Supply
Separate floating supply for each transmitter is recommended (see
upper Figure 18 on page 35.) If you have to connect several
transmitters to one AC supply, the phase (~) must always be
connected to (+) connector of each transmitter (see lower Figure 18 on
page 35).
0601-013
Figure 18 Connections to 24 VAC Power Supply
CAUTION
In case you have only one AC supply, never connect same wire to the
+ connector of the transmitter and - connector of another one. This
kind of connection will cause short-circuit.
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