35
Lower temperature alarm
If the temperature measured by the temperature sensor drops below the lower threshold, the temperature controller
emits a signal sound after a delay time (adjustable in function "F10") and the temperature display alternates with the
error message "E3" in the display. The LED " " (11) lights up.
To prevent an alarm from being tripped quickly after activation or commissioning of the temperature control-
ler, the function "F11" can be used to set a separate delay time.
The lower threshold is calculated as follows:
Lower threshold = (target temperature) - (hysteresis value, function "F2") - (difference, function "F9")
Example: Temperature threshold = +10 °C
Hysteresis value (adjustable in function "F1") = 3 °C
Difference (adjustable in function "F9") = 15 °C
The lower threshold therefore is (+10 °C) - (3 °C) - (15 °C) = -8 °C; the signal sound and the display “E3” will begin
when the temperature measured by the temperature sensor drops below -8 °C.
The signal sound and the display "E3" will, however, only start after the end of the delay time (adjustable in
function "F10"). This prevents too-frequent alarms.
Briefly pushing the button "
" (9) deactivates the signal sound, but the LED " " (11) will stay lit.
The alarm is ended when the temperature is back in the normal range (target temperature ± hysteresis
value). The LED " " (11) goes out.
Alarm at error at the temperature sensor
When the temperature controller does not recognise the temperature sensor at once (e.g. not connected or cable
damaged), it will emit an alarm sound and the display will show "E1". The LED " " (11) lights up.
Briefly pushing the button "
" (9) deactivates the alarm sound, but the LED " " (11) will stay lit.
Before opening the housing of the temperature controller to find the cause (e.g. temperature sensor not or
incorrectly connected), disconnect the temperature controller and the connected devices from the mains
voltage on all sides! There is danger to life from electric shock otherwise!
i) Calibrating the Temperature (Function "F3")
If you have a high-quality thermometer, you can calibrate the temperature controller. In the function "F3", a tempera-
ture value that is deducted from or added to the actually measured temperature can be set.
Example: Measured temperature = + 10 °C
Calibration value = +2 °C
The temperature controller now displays a temperature of +12 °C. The calibrated temperature value in the display is
also used for controlling the temperature controller.
Calibration can also be used to reconcile the display and function of several temperature controllers with
each other.
