15
14
5.1.3 Example connection of one AUX-output
In this case the home automation system’s logic input is pulled to ground potential when
the AUX-output signal is active. Note that the maximum current pass in the optocoupler is
10 mA!
The diagram illustrates the connection of one AUX channel. AUX1 and AUX2 are similar.
ѧ
HINT
Most building automation systems are equipped with inputs that are designed in a way
that they do not need the pull-up resistors. One example of this kind of input is a 2-terminal
input designed for connecting between relay contacts (potential free connection). In this
kind of situation the AUX can usually be wired directly to the automation system. The only
thing that must be observed is the current flow direction (IN >OUT) and that the current
passing through must be limited to less than 10 mA by the automation system.
5.1.4 AUX-signal logic interpretation
The AUX-signals can be interpreted in many ways:
• Simple ON/OFF information for any type of alarm (heat, fire or water leak). This can be
read directly from AUX1 output.
• Simple ON/OFF information for cooking activity. This can be read directly from AUX2
output.
• Simple ON/OFF information for a fault condition. This can be read directly when both
AUX1 and AUX2 are connected in series to the same line.
• Four-state output according to the table below. This can be used by reading both AUX1
and AUX2 separately into the automation system and using internal logic to decide the
state.
+3 ... +24 VDC provided by the
automation system
Pull-up recommended to provide
~1mA (absolute max. 10mA)
Logic input of the automation
system
Signal ground of the automation
system
IN
OUT
SAFERA
5.1.5 OUTPUT signals in normal AUX-mode
AUX1
state
AUX2
state
GARO system status
OFF
OFF
Nothing to report
No active cooking or dangerous situation detected.
OFF
ON
Normal cooking detected
This state will activate immediately when the stove is powered. It
will turn off in roughly 1 to 30 minutes after the cooking has stopped,
depending on how hot or powerful the cooking has been. This delay
serves two purposes:
1) the signal can be used for optimally controlling the cooker hood fan
or a kitchen extractor fan, and
2) the signal OFF->ON steps can be used for counting the amount of
cooking processes.
ON
OFF
Alarm
Dangerous situation detected: cooking hazard, timeout or extreme
stove temperaure has caused a power cutoff from the cooker. Also,
water leakage alarm will trigger this state. This state will be cleared
only when the user presses the OK-button of the Sensor Unit.
ON
ON
Service needed
In most cases, power to the cooker has been cut off until the fault is
resolved. This includes all critical Sensor Unit or Power Control Unit
faults. Press the OK-button of the Sensor Unit to see the exact cause
for the fault.
5.1.6 Inversed AUX-mode
Inversed AUX-mode = all ON signals indicated as OFF and vice versa in the table above.
Inversed signal mode can be useful for example when the maximum reliability for fault de-
tection is needed: if the wires are broken, or all electricity is cut off, the output will be the
same in as the AUX1:OFF & AUX2:OFF “fault condition”.
⚐
ATTENTION
The inversed mode will create a larger load for the connected system, because both signals
will be ON most of the time. For example, this may be harder for battery operated external
clients. However, it will not affect the GARO system's own battery life.