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Old 07-07-2016, 04:43 PM   #1
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Default photocell with time on control

I was asked to submit a bid on the installation of new LED flood lights to light up a subdivision entrance sign. the client wants the lights to come on at dusk, and stay on for 4 to 5 hours, and i cant seem to figure out what to use here. Any help would be appreciated.
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Old 07-07-2016, 04:50 PM   #2
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I was asked to submit a bid on the installation of new LED flood lights to light up a subdivision entrance sign. the client wants the lights to come on at dusk, and stay on for 4 to 5 hours, and i cant seem to figure out what to use here. Any help would be appreciated.
Time delay off relay would do the trick.
Others may know of an 'of the shelf' solution though.
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Old 07-07-2016, 04:57 PM   #3
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I was asked to submit a bid on the installation of new LED flood lights to light up a subdivision entrance sign. the client wants the lights to come on at dusk, and stay on for 4 to 5 hours, and i cant seem to figure out what to use here. Any help would be appreciated.

http://www.intermatic.com/en

Intermatic has canned solutions for every manner of lighting control... plug-n-play simplicity.

You won't even need a photo-cell as their stuff comes with a digital memory that knows when the Sun sets. You merely dial in the latitude and pick a time zone // longitude.

You're better off just picking up the telephone and talking to their tech rep.
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Old 07-07-2016, 05:50 PM   #4
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I'm certain by now (2016) someone has built a decent PC on, timer off unit.

I've been using a cheap and easy method for decades with a simple photocell and "standard" T101 intermatic single pole timer.


Put the photo cell switch leg on one terminal of the mechanical contacts and the switch leg to the lights on the other terminal.

Set the timer to come on way early and you won't have to adjust it seasonally.

120V......PC.....timer contact A.......timer contact B........lights.

The only "hack" is, you must remove the timer motor lead from the contact terminal and make it hot.



.
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Old 07-07-2016, 06:08 PM   #5
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They are LED lights, tell the Majewski's to just leave the sign on all night. Connect a photocell and be done with it.
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Old 07-07-2016, 06:53 PM   #6
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Intermatic ej500 or 600. It's a digital astronomical in wall timer that will do what you want and adjust for dusk and dawn throughout the year according to your region


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Old 07-07-2016, 07:11 PM   #7
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Aube T1072-3 or Honeywell RPLS740B1008/U << same company.

Programmable astronomical timers.

^^ Totally blow the doors of 70's photocell control. I've got 30 foot trees covering up the old photocells.
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I like perfect.
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Old 07-07-2016, 08:14 PM   #8
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They are LED lights, tell the Majewski's to just leave the sign on all night. Connect a photocell and be done with it.
Clearly they don't want to part with that extra nickel.
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Old 07-07-2016, 08:22 PM   #9
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I just thought they were being kind to the neighbours
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Old 07-08-2016, 12:15 PM   #10
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Photocell and clock contacts in parallel with each other.
Either one will take control depending on state. Simple and nothing required except a parallel circuit.

Actually I'm wrong. The photocell would still be closed even though the clock opens.
The clock would have to open the photocell contact as well. Easy enough.
Sorry about the mistake.
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Old 07-08-2016, 01:19 PM   #11
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hit the timer first then the photocell. As an example, set timer for on at 5pm and off at eleven. If it's not dark at 5 the light won't be lit but it will still turn off at 11.
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Old 07-08-2016, 07:55 PM   #12
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hit the timer first then the photocell. As an example, set timer for on at 5pm and off at eleven. If it's not dark at 5 the light won't be lit but it will still turn off at 11.
Many or most common photocels turn light on when power applied (normally closed?), light stays on for a few minutes until photocel opens.

So I would try going to photocel first and then to timer, clock motor always hot of course.
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Old 07-08-2016, 08:02 PM   #13
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Digital electronics has gotten so cheap that ROM replaces photocells.

You just DON'T NEED THEM ANY MORE.

The device is booted up -- and its clock is set -- and its location is entered.

The electronics does ALL THE REST.

Think of it as a specific purpose PLC.
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Old 07-08-2016, 09:51 PM   #14
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Simple... Have the TC control the photo cell and the photo cell control the lights or contactor.
Set the TC to come on at 4 pm and set to shut off when ever you want.


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Old 07-08-2016, 10:08 PM   #15
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Simple... Have the TC control the photo cell and the photo cell control the lights or contactor.
Set the TC to come on at 4 pm and set to shut off when ever you want.
See. It is easy. But I get the new stuff, the next great thing. My point was you could accomplish what the OP wanted without any special equipment.
Thanks Dash Dingo. Good post.
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Old 07-08-2016, 10:11 PM   #16
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See. It is easy. But I get the new stuff, the next great thing. My point was you could accomplish what the OP wanted without any special equipment.
Thanks Dash Dingo. Good post.
It's because everyone in Minnesota is smart.
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Old 07-09-2016, 12:03 AM   #17
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Macy's uses an astronomical timer for their sign lighting to make the lights come on in the evening and a local time clock to turn them off when the store closes. The store manager can control the time clock for whatever time they're closing. Here's how it's connected:

Sorry about the image being there 2x. First time posting a picture on this forum.
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photocell with time on control-time-clock-wiring.jpg  

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Old 07-09-2016, 12:04 AM   #18
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Digital electronics has gotten so cheap that ROM replaces photocells.

You just DON'T NEED THEM ANY MORE.

The device is booted up -- and its clock is set -- and its location is entered.

The electronics does ALL THE REST.

Think of it as a specific purpose PLC.
only problem i have with that is the old mechanical timers last for a long time, electronic **** is designed to fail! depends on if you want reliable or replaceable
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Old 07-16-2016, 09:34 AM   #19
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I would use an Intermatic 8215C time clock. It's multi-voltage and fully configurable for anything you want including pulse operation for mechanical contactors. Plus it is astrological. No photocell required. I've used them for all kinds of applications. Right now I have 4 of them controlling mechanically held contactors with an over-ride switch. They control the interior perimeter lights on four different wings in my hospital.
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