TDD
TDD
K06/0416
page 13
Example:
Switching point: 50 °C; window point: 70 °C; hysteresis: -2 °C
The temperature contact switches when 50 °C is exceeded.
If the temperature remain between 48 °C (50-2) and 72 °C (70+2), the contact will
also remain in active switching condition (LED on). If it exceeds 72 °C or drops
below 48 °C the temperature switch switches back.
11.4. Switching behaviour
The following diagram clarifies the switching behaviour of the temperature switch.
The contact closes (contact type: no) when it drops below the switching point or
the window point. It only opens again if the window point plus hysteresis is
exceeded or if it drops below the switching point minus hysteresis. An
LED
indicates the switching condition of the switching point.
time/ t
Display
bar (°C)
Switching pt.
Hysteresis
LED ON
time / t
Display
bar (°C)
Switching pt.
Hysteresis
LED ON
Hysteresis
Window point
LED ON
