6 Commissoning, operation
WIKA operating instructions, model A-AI-2
19
Example:
You want to control the temperature of a heating coil, with a hysteresis of +2°C, to
120°C. Therefore you will have to select the turn-on-point “1.on“ to 120°C and the
turn-off-point to “122°C“.
=> When your heating coil temperature falls below 120°C it will be turned on. When
the temperature rises above 122°C the heating coil will be turned off.
Note: Depending on the inertia of your heating coil an overshooting of the
temperature may be possible.
A-AI-2-S:
When selected '2-point-controller' you finished configuring your device. Press button
1 to switch over to display the measuring value.
When selected '3-point-controller' you have to make the following settings similar to
the settings you already made for output 1:
“2.on“ (turn-on-point of output 2) and
“2.off“ (turn-off-point out output 2)
Now you finished configuring the switching point adjustment of your device. Press button 1 to finish
the adjustment and to switch over to display the measuring value
6.3.2 Min-/Max-Alarm
(A-AI-2-1)
Min-/Max-Alarm (common or individual) (A-AI-2-S)
This chapter describes how to configure the device‘s alarm boundaries for min-/max-alarm-monitoring.
This instruction demands that you selected “AL“ (or “AL.2F” for A-AI-2-S) as your desired output
function.
Press button 1 (when not already done) , the device will display “AL.Hi“. (maximum alarm-
value)
Use button 2 and button 3 to set the desired value, the device should turn on its maximum-
alarm.
Press button 1 to validate your selection. The display shows “AL.Hi“ again.
When pressing button 1 again, the device will display “AL.Lo“. (minimum alarm-value)
Use button 2 and button 3 to set the desired value, the device should turn on its minimum-
alarm
Press button 1 to validate your selection. The display shows “AL.Lo“ again.
When pressing button 1 again, the device will display “A.dEL“. (delay of the alarm-function)
Use button 2 and button 3 to set the desired delay of the alarm-function.
Note: the selected value [0 ... 9999] accords the alarm delay in seconds.
The device will turn on the alarm after minimum or maximum alarm value was active for the
delay-time you have set.
Press button 1 to validate the delay time. The display shows “A.dEL“ again.
Example:
You want to have a temperature alarm-monitoring of a greenhouse. The alarm
should start when the temperature rises above 50 °C or falls below 15 °C. Therefore
your settings will be 50 °C for the maximum alarm-value “AL.HI“ and 15 °C for the
minimum alarm-value “AL.Lo“.
=> The alarm will be starting after the temperature rises above 50 °C and stays
above 50 °C for the entered delay time or after it had been falling below 15 °C and
stays below 15 °C for the entered delay time.
Please note that the alarm-outputs are inverted! This means, that the output will be active when there
is no alarm!
