Section 2
2.6 Recipe
Modification
2.6.1 Set
point
Modification (Access Level 2)
1) Change Temperature (Access Level 2)
Place the cursor on the temperature setting to be modified. Type the new setting and press enter from the
keyboard.
NOTE: Temperature display is in degrees Celsius.
2) Change Power Distribution (Access Level 2)
a) Heating Element Power distribution
Default value is 50% top and bottom.
Place the cursor on the power distribution setting to be changed. Type in the new setting and press
enter from the keyboard. This can be between 0% and 100%.
Power distribution is a scaled percentage of maximum power output to the top and bottom heating
elements.
The maximum power is typically set at 1.5 times the actual percentage of power used when the
furnace is in the “Ready” mode.
b) Edge Heater Power Distribution (Access Level 2)
The edge heaters are located at the outer edges of the belt and run the entire length of the heated
chamber. They can be used to improve the temperature uniformity across the width of the belt.
Click on the blue cell to modify the percentage on. The range is 0-100% and can be set in
increments of 1%. See the Reference Manual for more on using the edge heaters.
2.6.2 PID Zone Tuning (Access Level 2)
On the recipe screen, click on the
desired “Edit Zone PID Setting”
pushbutton. A Zone Tuning dialog
box will appear with default values
for proportional gain, integral, and
derivative, if not already shown on
the screen. Place the cursor on the
value to be modified and click.
Type the new setting and press
enter from the keyboard. See
Reference Manual, Chapter 9 for
Process Engineering considerations
in establishing PID parameters.
Gain
(Prop
ortion
al
Gain influences the proportional response of the PID by amplifying the error
between set point and actual temperature to establish an output level. The proportional band, in degrees
Figure 2.6.1 Zone Tuning Recipe Screen
Table 2-6 PID Initial Settings
Parameter
Initial
Values
Proportional Gain
9
Integral 45
Derivative 0
2-14
LA-309 Owner’s Manual
Summary of Contents for LA-309
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