K-O2 Oxygen Sensor
5/20/2022
Kele, Inc. • 3300 Brother Blvd. • Memphis, TN 38133
Page 5
www.kele.com
Figure 6
: Location of Power Connector
In the
NO Configuration
, the voltage attached to the
NO
terminal will be present at the
COM
terminal
only when
the relay output is activated.
In the
NC Configuration
, the voltage attached to the
NC
terminal will be present at the
COM
terminal
only while
the relay output is deactivated:
the voltage attached to the NC terminal is removed when the relay output is
activated.
Example wiring diagrams for relay connection are provided in
Figure 5. To wire the
Warning/ventilation
and
Alarm
relay
outputs:
1.
Determine if the device being attached to the relay
output should be wired in NO or NC configuration.
2.
Unplug the relay output screw terminal.
3.
Connect a supply voltage for the device being attached
to the controller’s relay output to either the
NO
or
NC
location of the screw terminal (see Figure 4).
4.
Wire the power input of the device being attached to
the controller’s relay output to the
COM
location of
screw terminal.
5.
Plug the relay output screw terminal back into the
correct location on controller board.
3.3
P
OWER
C
ONNECTION
The K-O2 has a fully isolated, unpolarized power input; either
AC or DC operating power can be connected in either polarity.
Multiple K-O2 units can operate on the same transformer (up to
its load limit) even when they are not connected with the same
positive/negative or hot/common polarity.
Power connection to the controller is made at the two-terminal
screw connector located at the bottom-right side of the board
(highlighted in
Figure 6
). Power to the controller can be either
AC or DC voltage; DC voltage can be connected in either polarity
(see
Section 1.0
for more details). To wire power:
1.
Open the controller’s enclosure and unplug the screw
terminal labeled
POWER
on the controller board.
2.
Attach power wires to the screw terminal ensuring the
connection is snug.
3.
Plug the screw terminal back into the
POWER
receptacle on the controller board: this will cause the
controller to power up and begin operation.
It is recommended that all wired connections are made prior to providing power to the controller.
Figure 5:
Example Wiring Diagram for
Normally Open Operation