
HMP240
User's Guide M210300en
16
3.4.1 Connection to a 24 VAC supply
The HMP240 transmitter can also be connected to a 24 VAC supply without
an external rectifier. However, when more than one transmitter is connected 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 3.7 A). However, if several transmitters have to
share one transformer, the phase (∼) must always be connected to + connector
in each transmitter (see Figure Figure 3.7 B).
24 VAC
HMP243 transmitter
HMP243 transmitter
Controller
shared
common line
24 VAC
24 VAC
HMP243 transmitter
HMP243 transmitter
Controller
supply voltage
signal output
supply voltage
signal output
supply voltage
signal output
supply voltage
signal output
B) COMMON LOOP FORMED -
NOT RECOMMENDED!
A) NO COMMON LOOP FORMED - RECOMMENDED
Figure 3.7 Connecting the transmitters to a 24 VAC supply (valid
also for the HMP247 transmitter).
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