TDD
page 12
TDD
K06/0416
11. Main Menu Options
11.1. Switching point
In menu option "
SP0
",
“SP1
” and
“SP2”
the switching point is entered. A setting
value between -199 and 999 can be selected. This value can also include a
decimal point. The decimal point can be set at two points (e.g. 10.0 or 100). If the
measuring value is the set switch point, the temperature switch is activated and is
signalised by a lightning LED.
If the hysteresis is zero and the window point is inactive, the temperature switch
will be reacted if the temperature is below the switch point.
11.2. Hysteresis
After the setting of switching point, the hysteresis can be entered as a negative
value in the "
HYS
",
“HY1”
and
“HY2”
menu. The standard hysteresis value is
zero. In operation condition this can lead to ambiguous switching behaviour if the
reading fluctuates around the switching point or window point. Aid can be given
here by increasing the hysteresis. The hysteresis relates to the switching point
and the window point (switching point minus hysteresis; window point plus
hysteresis).
Example:
Switching point 100 °C; Hysteresis: -2.5 °C
The temperature switch switches when 100 °C is exceeded and
switches back when the reading drops below 97.5 °C.
11.3. Window point (Double Point), (only for TDD-1… and TDD-3…)
As well as the switching point, it is also to define a "
duo
" (duo-point), the window
point. This must be higher than the switching point. Using the window point and
the switching point it is possible to monitor the measurement value in a certain
range. The switching point limits the measurement range to smaller values and
the window point to larger values.
If the window point (duo-point) is less than or equal to the switching
point, an error report (Er4) will be indicated on the display and its
value is deleted and its function is invalid (in the case that the
window point and switching point out of adjustment).
The value is set in the same way as the switching point.
The window point is needed for process, monitoring of a certain temperature
range.
