Super Systems 9205 Series - Manual (Page 172)

Series 9205 Operations Manual Rev A 171
Appendix B – Guide to Building a Recipe
The SSi 9205 is a multi-loop programmable recipe controller. The 9205 can control multiple loops
(temperature, carbon, flows) and has several assignable relay outputs (Events, End Of Cycle, Alarms, etc…)
that can be setup in a recipe to process work.
Things to understand before creating recipes:
1) Know how the furnace works. Have an understanding of not only what is happening to the work but
also how the furnace operates.
2) Know the limitations of the furnace.
3) Know what should be accomplished with the recipe.
Sample Recipe Structure for a 9205
The Recipes in the 9205’s operate from the top to the bottom. This means that if something happens in Step
4, but the recipe is in Step 2, the operation for Step 4 will not turn on until that point is reached. This also
means that if the recipe is in Step 4, anything from Step 1 through to Step 4 is currently active, on, or
present, unless it has been turned off in the recipe, or manually.
What is going on in this recipe?
1) Most likely, the furnace is already soaking at a temperature and perhaps a certain atmosphere
level as well. This particular unit has a process alarming setpoint that will be set in every recipe. In
Step 1, the process alarm is set so that the furnace temperature does not go higher than 25°F
above the highest setpoint. The recipe continues to Step 2.
2) In Step 2, the recipe is setting the Temperature and Atmosphere level. The recipe continues to Step
3.
3) In Step 3, the recipe is doing a TC_INQ (Thermocouple Inquiry). The recipe is checking to make sure
that the actual furnace temperature is at Setpoint or within a certain band (Set in the Default Wait
Limits in Configurator). Since it is best to drive the temperature down when loading a cold load into
a furnace, the recipe should not advance to the soak timer until the actual furnace temperature is
back to setpoint. The recipe will hold in this step until the furnace has reached this temperature
band. Once the furnace’s actual temperature has reached the temperature band, the recipe will
progress to Step 4.
4) The controller is now starting its Soak Timer in Step 4. The work will soak for 2 hours and 30
minutes. Once the Soak Timer has completed, the recipe will continue to Step 5.