adccommunitymod (AutomationDirect) asked a question.
Created Date: May 11,2016
Created By: Mario
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I'm trying to figure how do deal with gusts of wind. Project example: - an anemometer set to 15MPH with a N.O. contact that closes when wind exceeds set value - water feature (fountain, sprinklers, waterfall, etc.) that should stop running on windy days, so that passersby(s) aren't chased away by blown water spray. So my question is: how do I handle logic to ignore occasional gusts of wind, but not the constant howl of a windy day? I was thinking of few possibilities like: - Take a reading for 5-10 seconds and count the times that the contact was closed and if average > X , then shut the system down? - Shut it immediately and then take a readings over 10 seconds and do the math above (but in reverse) - How often do I check and at what point do call it quits and declare the day a windy one?
Created Date: May 11,2016
Created by: Mario
I'm trying to figure how do deal with gusts of wind.
Project example:
- an anemometer set to 15MPH with a N.O. contact that closes when wind exceeds set value
- water feature (fountain, sprinklers, waterfall, etc.) that should stop running on windy days, so that passersby(s) aren't chased away by blown water spray.
So my question is: how do I handle logic to ignore occasional gusts of wind, but not the constant howl of a windy day?
I was thinking of few possibilities like:
- Take a reading for 5-10 seconds and count the times that the contact was closed and if average> X , then shut the system down?
- Shut it immediately and then take a readings over 10 seconds and do the math above (but in reverse)
- How often do I check and at what point do call it quits and declare the day a windy one?
Created Date: May 11,2016
Created by: winterrossi
I'd probably do something like have the anemometer input start a timer. If the timer timed out at like 30 seconds or a minute, that would mean it was a constant wind speed over 15 mph. Then shut it down. Maybe have it test the wind speed once an hour, so if the wind died down during the day the fountain could start up.
Timing may have to be a trial and error type thing.
Created Date: May 11,2016
Created by: rday78
What are you using for an anemometer? Sounds like a nice project
Created Date: May 11,2016
Created by: Mario
What are you using for an anemometer? Sounds like a nice project
I'm just updating logic from old mechanical relays & timers that never really worked right to a PLC based setup.
They have an older version of this installed: http://www.comptus.com/wind-measurement/anemometers/a75-104-sine-anemometer-detail
On integration side, it's just a N.O. or N.C. point.
Created Date: May 11,2016
Created by: Mario
I'd probably do something like have the anemometer input start a timer. If the timer timed out at like 30 seconds or a minute, that would mean it was a constant wind speed over 15 mph. Then shut it down. Maybe have it test the wind speed once an hour, so if the wind died down during the day the fountain could start up.
Timing may have to be a trial and error type thing.
How would something like this work? How do you check to see if wind tripped while the 30sec timer was running?
Created Date: May 11,2016
Created by: g.mccormick
I would use two timers and a coil. The coil Wind_High would be set with high wind timer turns on and would be sealed in until low wind speed timer turns on.
n100682
Created Date: May 11,2016
Created by: winterrossi
If anemometer closes the contacts making the input true at 15 mph, then if the wind dropped below 15 mph it would make the input go false and reset the timer. Therefore, unless the wind was constant above 15 mph for 30 seconds, the timer contact would never close and shut down the system.
Created Date: May 11,2016
Created by: winterrossi
The example g.mccormick posted is what I was talking about doing. The low wind speed timer could be set for an hour or whatever is needed. It would not come into play unless the high wind speed shutdown has been set.
He used analog input for the anemometer. I assumed it was a discreet input. Either way it will work, you just need normally open and normally closed inputs in place of his compare instructions.
Created Date: May 11,2016
Created by: g.mccormick
The example g.mccormick posted is what I was talking about doing. The low wind speed timer could be set for an hour or whatever is needed. It would not come into play unless the high wind speed shutdown has been set.
He used analog input for the anemometer. I assumed it was a discreet input. Either way it will work, you just need normally open and normally closed inputs in place of his compare instructions.
Yeah I missed the part about the anemometer being a discrete device.
Created Date: May 11,2016
Created by: Mario
I would use two timers and a coil. The coil Wind_High would be set with high wind timer turns on and would be sealed in until low wind speed timer turns on.
n100682
The anemometer only reports contact closure (or open) to the PLC. I don't understand how your example would work in my case?