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Art Freas 06-13-2020 08:14 PM

Watlow programming question
 
I am rewriting some programs on my furnace controller. There is an option " wait for process crossover value (WPr)" that applies to soak steps. Reading the manual it seems that this says wait until the previous step value / temp is reached before starting the soak. So if I am reading this correctly if step 1 is get to 500 degrees in two hours and then step 2 is soak for an hour Wif Pr set to true will only start the soak step after it reaches 500. If step 1 is 450 after 2 hours the soak timer won't start but once the furnace reaches 500, even if that is 5 hours later then the soak step will start. Is this correct? Many thanks.
Art

Eben Horton 06-13-2020 08:59 PM

Sounds right.

Patrick Casanova 06-13-2020 09:27 PM

I ran an Watlow 8CLS for 20 years... Yes Some times it can be more problematic coming down if your annealer cools slower than the time set for the segment. The next segment won't start until you reach the set point called for in that segment, even though the time set had.

Eben Horton 06-14-2020 07:37 AM

Quote:

Originally Posted by Patrick Casanova (Post 147980)
I ran an Watlow 8CLS for 20 years... Yes Some times it can be more problematic coming down if your annealer cools slower than the time set for the segment. The next segment won't start until you reach the set point called for in that segment, even though the time set had.

Thatís why I have a fiber blanket walled annealer. It drops at just the right rate and I can control cooldowns 100%.


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