Fallback and set commands in Apex and doing control

jaxredsoxfan · Jul 10, 2019

I have a jabeo 4 head doser and saw a post recently where some folks had these dosers overdose. Scared me a bit, so I wanted to add some safeties to me Apex for it. Here is my current code for the doser:

Fallback OFF
If ATKR_H OPEN Then ON
If ATKR_H CLOSED Then OFF
If pH > 8.40 Then OFF
When On > 005:00 Then OFF
Defer 000:10 Then ON
Defer 000:04 Then OFF
Min Time 060:00 Then OFF

What is the difference between the fallback and set commands? Also the doser is programmed by itself to dose Alk at 500AM and CA at 530AM each day, and thats it until the next day. I had it originally set up in the manual ON position on the APEX but switched it to auto- will this set of commands allow it to dose on schedule? Or do folks write code to only turn it on around the time it is going to dose and leave it off at all other times? Any code examples of other peoples Apex controls for dosers would be appreciated. Thanks!!

saltyhog · Jul 10, 2019

What is ATKR_H in your system? A switch of some sort I assume? I'm not an Apex programming expert but it looks like if that switch is open (off) your doser is going to be pumping(unless it has it's own controller).

I have my dosing pumps set up to dose 24 times a day (alk on the top of the hour and Ca on the bottom of the hour). Seems to be more stable to me. Also, if you have a pretty high alkalinity requirement and are dosing it all at one time it may get shut off early by your pH program (which I also have and think is a good idea).

Edit....never mind, I see it has it's own controller (I'm using simple BRS dosing pumps)/

saltyhog · Jul 10, 2019

Set commmand determines the usual condition of the outlet....Set ON means it will be on unless some other program shuts it off. Set OFF means it will be off unless another program turns it on.

Fall back is what you want the outlet to do if all other programming fails. For my lights, Fall back is on, for pumps I usually set Fall back to off.