Vaisala CARBOCAP GMT220 SERIES Podręcznik Użytkownika Pobierz pdf (Strona 11)

CHAPTER 4 _____________________________________________________ ELECTRICAL CONNECTIONS

VAISALA __________________________________________________________________________ 9

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 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 risk of a short-circuit increases. 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 (24 V) in each transmitter

(see figure 7 B).

24V OUT

GND

24V OUT

GND

CONTROLLER

GMT220

Signal

output

Signal

output

Supply

voltage

Supply

voltage

A) Connection of separate AC supplies to the transmitters (recommended connection).

GMT220

24VAC

24V OUT

GND

24V OUT

GND

Signal

output

Signal

output

Supply

voltage

Supply

voltage

SHARED

COMMON

LINE

B) Connection of one AC supply to the transmitters.

GMT220

CONTROLLER

24VAC

Figure 7. AC Connections.

(∼)

(

∼)

(

∼)

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