30
Operation and control
5.5.2
Electronic temperature limiter ( TWB) protection class 2 acc. to DIN 12 880
If the manually set monitoring temperature
max
is exceeded, the TWB switches off heating
permanently (Fig. 18 ) and can be reset by pressing the confirmation key.
In programme mode, the current programme is resumed for TWB alarms of up to 15
minutes. If the alarm is active for more than 15 minutes, the programme is cancelled.
t
°C
heating switched off by TWB
Setting MAX
Set
temperature
Controller error
Fig. 18
Schematic diagram of how the TWB temperature monitoring works