BINDER VD 23 - Manual (Page 54)

VDL (E2.1) 04/2014 page 54/107
8. Program editor
8.1 Selecting between set-point ramp and set-point step
You can program various kinds of temperature transitions. In the user level (chap. 10) you can select be-
tween the settings “Ramp” (default setting) and “Step”.
Setting “Ramp” allows programming all kinds of temperature transitions.
With setting “Step” the controller will equilibrate only to constant temperatures; programming
ramps is no longer possible.
Switching between settings “Ramp” and “Step” will influence all programs. Please note that this
can cause the time courses of existing programs to change significantly.
8.1.1 Programming with setting “Ramp” (default setting)
Set-points always refer to the start of a program section, i.e., at the beginning of each program section,
the entered set-point is reached. During program section operation, the temperature gradually passes to
the set-point entered for the subsequent program section.
You can program all kinds of temperature transitions by the appropriate design of the program section
timing:
•
Gradual temperature changes “set-point ramp“
The set-point gradually moves from one set-point to the one of the following program section during a
given interval. The actual temperature value (X) follows the continually moving set-point (W) at any
time.
Temperature ramps can be programmed in order to extend the heating up times. This may be neces-
sary in order to avoid temperature stresses in the material during the heating up phase. Heating up
times can be considerably slowed down by the use of temperature ramps.
• Program sections with constant temperature
The initial values of two subsequent program sections are identical; therefore the temperature remains
constant during the whole time of the first program section.
• Sudden temperature changes “set-point step”
Steps are temperature changes (ramps) that occur during a very short interval. Two program sections
with an identical set-point are followed by a section with a different set-point. If the duration of this tran-
sitional program section is very short (minimum entry 1 min), the temperature change will proceed rap-
idly in the minimum amount of time.