Installation
RC protection for relay
16
© Lutz-Jesco GmbH 2018
BA-40900-02-V01
Gas warning device
EASYCON GW
Operating instructions
7.6.3 Output circuit board (optocoupler)
The output circuit boards can optionally be fitted with optocouplers. Opto-
coupler circuit boards serve the output of a digital signal , e.g. to a PLC or
a superordinate control centre. The outputs can be freely-configurable
and can relay alarms, the exceedance of limit values, sensor errors or the
switching of digital inputs.
79832_1
Bild BA CM Ausgangsmodul 2 Optokoppler
4
3
2
1
Fig. 11: Output circuit board (optocoupler)
Terminal
Function
Description
1
+
Opto X.2
Freely-configurable
(only at output 3 and 4)
2
-
3
+
Opto X.1
Freely-configurable
(only at output 3 and 4)
4
-
Table 13: Clamp connection output circuit board (optocoupler)
Testing the signal technology
The device enables you to test the correct connection of the signal tech-
nology. The test simulates an alarm and the connected signal technology
is activated.
Take the alarm chain into account before conducting the test and inform
any connection points or interrupt the alarm chain for the period of the
test.
Precondition for action:
ü
The signal technology was installed in accordance with section 7.6
“Connecting the signal technology” on page 15.
ü
The device housing cover is closed.
ü
The voltage supply has been established and the device has been
switched on.
Instruction:
1.
In the main menu, navigate to System > Outputs > Test.
4
You will now see all the outputs.
2.
Select the outputs that you would like to test.
3.
Press "Start”.
4
The signal technology connected will now be activated as in the
case of an alarm.
ü
Signal technology tested.
7.7 Digital inputs
You can use up to 8 digital inputs to evaluate switching statuses and to
detect them as alarm message which are to be documented in the log-
files.
Further information about the settings of the digital inputs can be found in
section 8.2.1.3 “Digital” on page 18.
7.8 RC protection for relay
When connecting to the relay, note that inductive loads must be sup-
pressed. If this is not possible, the relay contact on the device terminal
must be protected by an RC protective circuit / interference suppression
element.
If devices with inductive loads from a nominal current of 1 A are connect-
ed to a relay, the contacts in the relay may become bonded. Thus, the de-
vice will operate in an uncontrolled manner. To prevent bonding if the load
circuit suffers a short-circuit, the relays must be protected separately on
the maximum relay switching current.
Precondition for action:
ü
You would like to connect an inductive load to the relay.
Instruction:
1.
Switch off the device.
2.
Clamp the interference suppression element parallel to the inductive
load.
3.
Should it prove impossible to perform point 2, clamp the interference
suppression element parallel to the relay output.
ü
RC element clamped.
