Vaisala PTU300 Betriebsanweisung PDF herunterladen (Seite 53)

Chapter 3 _______________________________________________________________ Installation

VAISALA _______________________________________________________________________ 51

Relays

PTU300 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 162.

Installation and Wiring

1. Disconnect the power and open the transmitter cover. In case the

relay-module is installed in the factory, continue with step 5.

2. To attach the module 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

MODULE 1 pins of the motherboard.

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, NC. Refer to

section Selecting the Activation State of the Relay.

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.

7. Connect the power and close the cover.

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

NC 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.

NOTE

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

for the relay output and set the relay setpoints) see section Operation of

Relays on page 119.

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Vaisala PTU300 Betriebsanweisung Seite 53