Vaisala BAROCAP PTB330 Guide de l'utilisateur télécharger pdf (Page 43)

Chapter 3 _______________________________________________________________ Installation

VAISALA _______________________________________________________________________ 41

Selecting the Activation State of

the Relay

The middlemost C terminal and either one of the terminals NO/NC

must be connected. The polarity can be freely selected.

NO Normally open

C Common relay contact

NC Normally closed

Relay NOT activated: C and NC outputs are closed, NO is open

Relay IS activated: C and NO outputs are closed, C and NC are open.

NOTE

For instructions on how to operate the relay (for example, select

quantity for the relay output and set the relay setpoints) see section

Operating Relays on page 93.

Figure 24 Relay Module

Numbers refer to Figure 24 above:

1 = Indication led for the relay 1

2 = Relay test buttons

3 = Flat cable pins

4 = Indication led for relay 2

1 2 ... 38 39 40 41 42 43 44 45 46 47 48 ... 143 144

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Vaisala BAROCAP PTB330 Guide de l'utilisateur Page 43