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User's Guide ______________________________________________________________________
NOTE
50 _______________________________________________________________ M210796EN-C
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 166.
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 below.
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:
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 120.
C and NO outputs are closed, NC is open.
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