38
D39374 | Date 08/2018
Operation and control
The monitoring temperature of the electronic temperature
monitoring is measured via a separate Pt100 temperature
sensor in the interior. Temperature monitoring settings are
made via the
ALARM
display. The settings made apply to all
operating modes.
If temperature monitoring has been
triggered, this is indicated on the
temperature display: the actual
temperature is highlighted in red and
a
warning symbol is shown ( Fig.
27 ). The type of temperature monitor-
ing triggered (TWW in this example) is
shown beneath the temperature.
If the acoustic alarm has been activated in menu mode (
Sound
see page 60, indicated
by the speaker symbol
on the alarm display), the alarm is additionally signalled by an
intermittent acoustic signal, which can be turned off by pressing the confirmation key.
Information on what to do if this happens can be found in chapter Malfunctions, warn-
ing and error messages from page 44.
Before reading how to adjust temperature monitoring (from page 39), please read the
description of the individual monitoring functions here.
5.4.1
Electronic temperature monitoring ( TWW)
The manually set monitoring temperature
min.
and
max.
of the electronic overtem-
perature control is monitored by an adjustable over/undertemperature controller (TWW)
protection class 3.1 acc. to DIN 12 880 (or over/undertemperature controller (TWW)
protection class 3.1 for UIS appliances). If the manually set monitoring temperature
max
is exceeded, the TWW takes overtemperature control and begins to regulate the monitor-
ing temperature (Fig. 28).
t
°C
Setting MAX
Set temperature
Controller error
Emergency operation
Fig. 28
Schematic diagram of how TWW temperature monitoring works
ALARM
max
190
.0°C
5.0
K
mi
n
160
.0°C
auto
+-
°C
TEMP
°C
Set 180.0
TWW
189,4 °C 4
3
189,1 °C 2
189,2 °C 1
189
.2
Fig. 27
Temperature monitoring triggered
