UK Please check my logic for upgrade lights project wiring!

[renegade]

Hi all,

I have some outdoor lights, and I want to update the circuit to add a bit more functionality. I have drawn a little picture of what I have now:

When we walk past the Outdoor PIR sensor 1, all lights come on, and then go off. This works fine!

Now the behaviour I want:

1. Add another PIR sensor to the other side of the lights
2. Add a dusk till dawn sensor (with timer)
3. Add a manual override switch in the house(so from inside the house I can turn on all outdoors lights, and leave them on if i want).

I have drawn a diagram of how I think this could work - and would like some feedback on whether my logic is correct and will give me the behaviour I hope for:

The Feed now goes to the junction box.

1. Sensor 1 -- Switch and Neutral wired to SW and N of Junction
2. Sensor 2 -- Switch and Neutral wired to SW and N of Junction
3. Normal Switch -- Live is wired to common with S1 wired to SW of junction
4. Dusk till dawn -- Live and N power timer (so i can control what time it should turn off at night time -- don't want it running till dawn, just 2am ish) -- this switch is wired to L of dusk till dawn. SW is wired to SW of junction box.

This should allow the following behaviours:

1. Somebody can walk past PIR sensor 1 or sensor 2 and it will trigger all lights on
2. Somebody can press normal override switch and all lights will stay on until the switch is closed
3. Dusk till dawn is powered between hours that timer controls, and will trigger all lights on when timer is on and dark is detected.

Does this look ok? Any feedback? Thoughts appreciated.

 

[Pete999]

Your diagram is not very clear quite confusing as a matter of fact, can you clarify?

 

[StephenRowley]

I think the logical thing is get a sparkie in. From what I can make out from that drawing there's a few fundamental mistakes that Dont make sense. Also you don't need the dawn to dusk sensor as the pir will have built in oned

 

[renegade]

Your diagram is not very clear quite confusing as a matter of fact, can you clarify?

Hi Pete999 - sorry - it wasn't very clear.

I tried colour coding the lines, and added a legend - hope that helps clear it up a bit?
[automerge]1576599465[/automerge]

I think the logical thing is get a sparkie in. From what I can make out from that drawing there's a few fundamental mistakes that Dont make sense. Also you don't need the dawn to dusk sensor as the pir will have built in oned

Actually I have had a sparkie in and he suggested I do it this way - hence i wanted to double check it! If you see some mistakes - please let me know. The PIR sensor does have one built in, but doesn't let me to the timer override, so i have to do it this way.

 

[MJPD29]

Send us a picture of the junction box when it is done

 

[renegade]

Send us a picture of the junction box when it is done

Okay - but I won't do it until somebody verifies this looks sound!

 

[Lucien Nunes]

It's generally OK and will give each of the behaviours you want. There is a slight minor objection that the output of the dusk-dawn sensor may be back-fed from the main SL terminal if either PIR or the override are active while its input (the timer output) is off. Whether this will cause any problem with the sensor will depend on its design; it shouldn't do and won't affect the operation of the lights anyhow. The lights may come on briefly when the timer goes live, even if it's not dark, while the sensor wakes up.

StephenRowley I believe the idea of the separate dusk-dawn sensor is to bring the lights on independently of the PIRs when it gets dark, then they go off at the predetermined time, leaving the PIRs active to bring them back on if anyone approaches after that. The sensor is not intended to control the PIRs, they rely on their own sensors to not trigger the lights during the day.

Seeing as I've given you the most accurate review of your proposal, I hope you won't mind me going further than Pete and saying that is about the worst drawing of anything I've seen for a long time The right things are connected together but I might need a beer to recover from the assault on my aesthetic sense.

 

[renegade]

It's generally OK and will give each of the behaviours you want. There is a slight minor objection that the output of the dusk-dawn sensor may be back-fed from the main SL terminal if either PIR or the override are active while its input (the timer output) is off. Whether this will cause any problem with the sensor will depend on its design; it shouldn't do and won't affect the operation of the lights anyhow. The lights may come on briefly when the timer goes live, even if it's not dark, while the sensor wakes up.

StephenRowley I believe the idea of the separate dusk-dawn sensor is to bring the lights on independently of the PIRs when it gets dark, then they go off at the predetermined time, leaving the PIRs active to bring them back on if anyone approaches after that. The sensor is not intended to control the PIRs, they rely on their own sensors to not trigger the lights during the day.

Seeing as I've given you the most accurate review of your proposal, I hope you won't mind me going further than Pete and saying that is about the worst drawing of anything I've seen for a long time The right things are connected together but I might need a beer to recover from the assault on my aesthetic sense.

LOL Lucien!

First off - thank you for your explanations.

Secondly -- can you take 5 minutes, to redraw it for me - that way I can learn how to draw it better next time!

Thirdly RE the backfed to dusk till dawn -- isn't that also the case with the 2 PIR sensors and the manual switch?

 

[MJPD29]

I'm finding it hard to follow but it does appear as of it will function as intended

Okay - but I won't do it until somebody verifies this looks sound!

 

[littlespark]

As long as none of the lives, or switched lives connect to a neutral, (or earth) it should pass the bang test.
After that, it’s just seeing if it works the way you want it to.

 

[Lucien Nunes]

RE the backfed to dusk till dawn -- isn't that also the case with the 2 PIR sensors and the manual switch?

They are backfed, but as their inputs are always live, this is a normal situation, their own electronics remain powered by the input. What is abnormal about the sensor is that it can be backfed when the input is dead (due to the timer being off), so if it is active when the timer goes off, the electronics start being powered from the output instead of the input.

If the sensor output is switched by a relay, there won't be any problem; it simply won't notice that the supply for its own electronics is coming in via the output as the relay makes a solid connection. It will go off and stay off once the source of the backfeed itself goes off, and no-one will be any the wiser. If its output is switched by a triac, then it might perhaps object to as the load won't be sufficient to hold the triac on properly, possibly making it go wobbly or cycle on and off while it shuts down. Unlikely though, and probably harmless.

Had the timer been controlling anything else independently, then the backfeed could cause a mis-operation, as it would bypass the timer if both controlled devices were active at once.

 

[renegade]

They are backfed, but as their inputs are always live, this is a normal situation, their own electronics remain powered by the input. What is abnormal about the sensor is that it can be backfed when the input is dead (due to the timer being off), so if it is active when the timer goes off, the electronics start being powered from the output instead of the input.

If the sensor output is switched by a relay, there won't be any problem; it simply won't notice that the supply for its own electronics is coming in via the output as the relay makes a solid connection. It will go off and stay off once the source of the backfeed itself goes off, and no-one will be any the wiser. If its output is switched by a triac, then it might perhaps object to as the load won't be sufficient to hold the triac on properly, possibly making it go wobbly or cycle on and off while it shuts down. Unlikely though, and probably harmless.

Had the timer been controlling anything else independently, then the backfeed could cause a mis-operation, as it would bypass the timer if both controlled devices were active at once.

Got it -- what could be done to work around that issue in this case (I know it is probably overkill, but am interested in options regardless)

 

[davesparks]

Use a timeswitch which has a volt free output to switch the outgoing switched live from the photocell.

 

[Sparky5473]

Use a timeswitch which has a volt free output to switch the outgoing switched live from the photocell.

Just what I was about to write

 

[Kidsolo]

sorry - it wasn't very clear.

The diagram was looking good until you added a house

Send us a picture of the junction box when it is done

It will look just like his diagram, with less straight lines

What is abnormal about the sensor is that it can be backfed when the input is dead (due to the timer being off)

It shouldn't be backfeeding the sensor, it only backfeeds the switch part of the circuit