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Figure 6 Electrical connections and jumpers
Power supply requirements
The GMT220 series transmitters are designed to operate with a
nominal 24 VAC/DC supply. The power supply should maintain the
voltage for all load conditions and all mains voltages. The power input
includes a halfwave rectifier. To avoid current peaks, it is
recommended to use a DC supply.
Connection to a 24 VAC supply
The GMT220 series transmitters 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 7 A).
CAUTION
If several transmitters have to share one transformer, the phase (∼)
must always be connected to + connector in each transmitter (see
Figure 7 B).
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