Configuration
Control Unit Models 9010 LCD and 9020 LCD
15
GB
5.3 Configuration with relay outputs
The Control Units 9010 and 9020 are furnished with 4 indication relays, respectively, alarm, warn-
ing, failure and horn, while the caution output is normally opto-isolated [default configuration] at
which reference is made to the EXTERNAL CONNECTIONS DIAGRAM for the back terminal
board connections.
The use of the voltage-free contacts must be done in accordance with the electrical characteristics
of the contacts themselves recorded in the TECHNICAL CHARACTERISTICS. The relays used
are single exchange [SPDT] for the Alarm and Warning outputs, while only the contact [SPST] is
available for the Horn and Failure outputs.
The failure relay mounted on the board is a double exchange relay with the contacts in series in
order to satisfy the safety needs of the ATEX directive.
The board with the relay outputs provides the following predispositions:
- Relays installed and alarm configuration in access code 4
- Configuration via step 1 of access code 52: indication 1
- If utilised, the opto-isolated CAUTION in absence of the 24 VDC external power supply: CV22
in position 2-3 a CV18 in position 1-2.
5.4 Configuration with opto-isolated outputs
In substitution for the relays, all of the outputs related to the alarm set-points [C, W and A], to the
indication of possible failures or of the out-of-service states predicted if the Control Unit operates
according to the ATEX Directive as well as to the activation of the possible external acoustic alarm
device can be predisposed with opto-isolated outputs.
These outputs are independent for each channel, even with model 9020, with the exception of the
output related to the activation of the external acoustic device [HORN].
Opto-isolated outputs are available with a common transmitter [MSA 173 card] or common collec-
tor [MSA 174 card].
The electrical characteristics of the opto-isolators are recorded in the TECHNICAL CHARACTER-
ISTICS section while, for the connections, see the EXTERNAL CONNECTIONS DIAGRAM,
which provide the power supply of the opto-isolators and therefore of the relays via an internal or
external 24 VDC power source.
The 9010/20 LCD with the opto-isolated outputs provides the following predispositions:
- Remove the relays from the respective sockets, mount the circuit with the opto-isolators having
a common transmitter or collector depending on the application
- Configuration via step 1 of access code 52: indication 2
- In order to use the opto-isolators with the 24 VDC power supply supplied by the board, connect
the jumpers:
Cv18 pos. 1-2, Cv22 of the base board without any solder points in pos. 1-2 or 2-3
Cv1 pos. 2-3 on opto-isolator board
- In order to use the opto-isolators with the 24V dc power supply supplied by an external source,
connect the jumpers:
Cv18 pos. 2-3, Cv22 of the base board without any solder points in pos. 1-2 or 2-3
Cv1 pos. 1-2 on opto-isolator board
For applicable examples, see drawing E07-3497 attached.
On model 9020 LCD, the relay outputs are in common with the two channels.
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