Vaisala DMT340 User Manual download pdf (Page 60)

User's Guide _______________________________________________________________________

58 ___________________________________________________________________ M210704EN-G

Alarm Relays

DMT340 can be equipped with one or two configurable relay modules.

Each module contains two configurable relays. See the contact ratings in

section Technical Specifications of Optional Modules on page 168.

Installation and Wiring

1. Disconnect the power. In case the relay-module is installed in the

factory, continue with the step 5.

2. To attach the module, open the transmitter cover and fasten the

relay module to the bottom of the housing with four screws. See the

position in Figure 2 on page 21.

3. When the mains power is in use attach the grounding wire to the

grounding terminal.

4. Connect the flat cable between the relay module and the

motherboard's pins MODULE 2 or MODULE 1.

5. Take out the protective plug from the cable gland and thread the

relay wires.

6. Connect the wires to the screw terminals: NO, C, and NC.

CAUTION

For installations in the USA: If your transmitter has both the relay

module and a LAN or WLAN module, the maximum voltage you are

allowed to connect to the relay module

is 50 V.

Selecting the Activation State of the Relay

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

be connected. The polarity can be freely selected.

Normally open

Common relay

Normally closed

Relay NOT activated:

C and NC outputs are closed, NO is open

Relay IS activated:

C and NO outputs are closed, NC is open.

Connect the power and close the cover. For instructions on how to

operate the relay (for example, selecting quantity for the relay output and

setting the relay setpoints), see section Operation of Relays on page 128.

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Vaisala DMT340 User Manual Page 60