Vaisala PTB330 - Manual (Page 42)

USER'S GUIDE____________________________________________________________________
40 __________________________________________________________________ M210855EN-D
Relay Module RELAY-1L
The barometer can be equipped with one configurable relay module.
The module contains two configurable relays.
NOTE The relay module is only intended for DC use.
Installation and Wiring
To install relay module RELAY-1L:
1. Disconnect the power and open the barometer cover. If the
relay-module is installed in the factory, continue with step 5.
2. To attach the module, first place a protective plate to the bottom
of the housing at module slot 3, then fasten the relay module to
the top of the plate with four screws. See the position in Figure
2, on page 16.
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 3 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. See
section Selecting the Activation State of the Relay on page 41.
7. Connect the power and close the cover.
8. If you are replacing an existing module, the installation is
complete. If you are adding a new module, continue to the next
step.
9. Connect to the service port, and execute the MODS command to
register the changes.
10. Switch the power off and back on again to clear related errors
and to activate the changes.