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utilization of power failure duration

Created by: miltos at: 7/9/2010 9:45 AM (9 Replies)

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7/9/2010 9:45 AM	Rate (0)
miltos Bronze Member Joined: 3/4/2009 Last visit: 10/28/2020 Posts: 57 Rating: (5)	Is it possible to utilize the duration of a power failure? For example i would like to abstract the power failure duration from the remaining time of a timer (on delay).

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7/9/2010 10:43 AM	Rate (0)
LOGO!Barbarian Posts: 173 Rating: (95)	Hey miltos! Some ideas! 1) If you use a LOGO! 230RC(o) - use a PC UPS (Uninteruptible Power Supply) to keep the 230V LOGO! running - connect the normal supply to a digital input on the LOGO! (same phase as L and N on I1..I4 or from a different phase on I5..I8) - 'watch' this input. - as soon as it 'drops out', start an impulse generator with 0.5sec / 0.5sec (i.e. connect the 'watched' input to the En, but inverted) - use an up/down counter to count the pulses (seconds) - use the analog maths (0BA6 only) to reference this value and the value from a timer and subtract the two from each other OR use the Stopwatch function written by Betel on the german forum (!) 2) If you use a 12/24RC(o) LOGO! - use a backup battery (and a charger) - connect the 230V live to be 'watched' via a 230V/12VDC relay - 'watch' this input as above Maybe this attachement might help! Cheers Aaaarrrghhhh!!!! ("Have a nice day!") Attachment Mains_Detect.zip (460 Downloads)
LOGO!Barbarian Posts: 173 Rating: (95)
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7/9/2010 11:54 AM	Rate (0)
miltos Bronze Member Joined: 3/4/2009 Last visit: 10/28/2020 Posts: 57 Rating: (5)	Hi Barbarian! Thanks for the response. If i use a UPS my problem is solved. There is no need to watch the duration of power failure, because the timer will run normaly. My problem is this: If a "on delay" timer" with 2 hours delay is triggered, i want the output of the timer to be ON after 2 hours, even if there is a power failure since the timer is triggered. If i use a UPS i don't have this problem. I wonder if i can do it without UPS. Maybe i could use real time clock (eg setting on time at weekly timer instead of triggering on delay), but it seems i can't. PS: It is not possible to reference the value of a timer to analog math. (But there is no problem to use 2 counters instead of 1 counter and 1 timer.)
	Last edited by: miltos at: 7/9/2010 11:59 AM
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7/9/2010 2:18 PM	Rate (0)
LOGO!Barbarian Posts: 173 Rating: (95)	Hey miltos! I now understand a bit better. See if the attached program helps - it was also maintaining the retentivity of a timer after a power failure. !!??!?!? Aaaaarrrghhh! ("Have a nice day!") Attachment Retentative_timer.zip (474 Downloads)
LOGO!Barbarian Posts: 173 Rating: (95)
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7/9/2010 3:54 PM	Rate (0)
miltos Bronze Member Joined: 3/4/2009 Last visit: 10/28/2020 Posts: 57 Rating: (5)	I think i didn't discribe good enough what i mean.Iwill try to discribe itbetter. Here is an example. I set an"on delay" timmer to 2:00h delay (retentivity on). At 20:00 the on delay is triggered At 20:30 there is a power failure. At 21:00 the power recovers. The on delay is still triggered At 22:30 the output of the on delay becomes ON. I would like the output of the on delay to become ON at 22:00 (2:00h after it was triggered), not at 22:30.
	Last edited by: miltos at: 7/9/2010 4:12 PM Last edited by: miltos at: 7/9/2010 4:11 PM
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7/10/2010 7:27 PM	Rate (0)
cdrshort Bronze Member Joined: 9/6/2008 Last visit: 3/29/2024 Posts: 134 Rating: (16)	hey miltos i think if we use a batery card we can " hold" the real time clock of logo. in this case if our prog based on a weakly timer ( on for 2 hours then off ) then the problem is maybe solved. is not the bestway but i dont have anything elseto suggest.
	http://electrotech-techblogg.blogspot.gr/
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This contribution was helpful to 1 thankful Users miltos

7/12/2010 12:45 AM	Rate (0)
miltos Bronze Member Joined: 3/4/2009 Last visit: 10/28/2020 Posts: 57 Rating: (5)	Hi cdr! My program is based on"on delay" timer, not ona weekly timer. Ifi could use o weekly timer, your suggestion would have solved the problem.

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7/12/2010 10:17 AM	Rate (0)
miltos Bronze Member Joined: 3/4/2009 Last visit: 10/28/2020 Posts: 57 Rating: (5)	Yes, i can use a weekly timer. In fact, this was the first idea and it is more simple for my apllication. But i was afraid that i could loose the RTC settings(80h without power supply). So i found another solution withtimers. When i answered yesterday nightmy mindwasin "nightmode", so when you mentioned battery card i didn't realise that it was my solution. Thanks alot. However,ithink that it would be usefulfor as to find an answer forthis topic. "How can we have a delay without interference of power failure?" (Retentivity is not enough)
	Last edited by: miltos at: 7/12/2010 10:18 AM
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7/12/2010 8:17 PM	Rate (0)
Betel Platinum Expert Joined: 1/5/2007 Last visit: 4/7/2023 Posts: 1690 Rating: (580)	Hi miltos, I think it is not possible to program a time delay with a full free trigger time. There is no way with the LOGO! to get or calculate the time of power of.. Best regards Betel _________________________________________________ Perhaps helpful links: Collection of notes and circuits for the use and programming the LOGO! Scalingof signals with analog blocks retreving data from logo
	==> Meine TAG-Listen: "deut." ==> "Sammlung von Hinweisen und Schaltungen" ==> "PD-3-Punkt-Schritt-Regelung (z.B. für Mischer)" ==> "Zeiterfassung, ASTRO-Uhr,..." ==> "Meine EXCEL-Tools" + "Tool zur Linearisierung" ==> "Komplexes Rechnen mit der LOGO"
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This contribution was helpful to 1 thankful Users miltos

7/14/2010 9:17 AM	Rate (0)
miltos Bronze Member Joined: 3/4/2009 Last visit: 10/28/2020 Posts: 57 Rating: (5)	Thanks Betel. Your answer didn't make me happy, but it was clear.

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