Quest Controls BACnet T-Stat Wartungshandbuch PDF herunterladen (Seite 30)

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101

30 • Power Supply

Isolation

WAGO-I/O-SYSTEM 750

BACnet/IP Controller

2.7 Power Supply

2.7.1 Isolation

Within the field bus node, there are three electrically isolated potentials.

• Operational voltage for the field bus interface.

• Electronics of the couplers/controllers and the bus modules (internal bus).

• All bus modules have an electrical isolation between the electronics (inter-

nal bus, logic) and the field electronics. Some digital and analog input

modules have each channel electrically isolated, please see catalog.

Fig. 2-10: Isolation g0xxx01e

Attention

The ground wire connection must be present in each group. In order that all

protective conductor functions are maintained under all circumstances, it is

recommended that a ground wire be connected at the beginning and end of a

potential group. (ring format, please see chapter 2.8.3). Thus, if a bus module

comes loose from a composite during servicing, then the protective conductor

connection is still guaranteed for all connected field devices.

When using a joint power supply unit for the 24 V system supply and the

24 V field supply, the electrical isolation between the internal bus and the

field level is eliminated for the potential group.

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