External lighting control

[pc1966]

The site has 12 * 50W LED floodlights and they are controlled by 2-3 switches (changeover/intermediate) that operate a relay for the actual lights to keep volt drop down. As it has CCTV it would be handy to be able to operate the lights remotely as well. Had it been planned that way in any detail, I'm sure it would be better done differently, but for now I was thinking of using a toggling relay such as this:

20.23.9.012.0000 | Finder DIN Rail Latching Power Relay, 12V dc Coil, 16A Switching Current, SP-NC, SP-NO | RS

uk.rs-online.com

To change the lights just like another switch would, my next plan was to use a Raspberry Pi or similar to allow a remote toggle of the state by pulsing the coil for 0.5s or so. My reason for looking at a mechanically latched relay is more so if the computer controlling things is rebooted, etc, it does not default to leaving all lights on in summer, etc. However, there might be a far better/easier way to do this, suggestions folks?

TL;DR Remote toggle of flood lights

 

[Mike Johnson]

Don't know if they are available in the UK, but DIN mounted electronic latching relay's are available on the continent and default open, I find the mechanical latching relay's far too noisy, loud bang as they latch in and out, may not be a problem in a commercial environment.

 

[pc1966]

Don't know if they are available in the UK, but DIN mounted electronic latching relay's are available on the continent and default open,

Any example / links for that?

I find the mechanical latching relay's far too noisy, loud bang as they latch in and out, may not be a problem in a commercial environment.

Here the sound is not an issue, drowned in cooling fans anyway!

 

[Mike Johnson]

Legrand: https://www.leroymerlin.fr/produits...encieux-unipolaire-legrand-16-a-69230945.html

I have Hager, but can't find a link at the moment, Hager part No EPS410B.

 

[pc1966]

This looks like the Legrand unit, but the data sheets are rubbish at explaining what it does (or does not) do!

4 124 00 | Legrand CX3 Series Contactor, 230 V ac Coil, 16 A | RS

uk.rs-online.com

 

[pc1966]

This looks even more promising as it has both a toggle input and separate off and on inputs. But no info on power-up state or price:

ELECTRONIC LATCHING RELAYS - Foxtam Controls (en-GB)

ELECTRONIC LATCHING RELAYS by Foxtam Controls (en-GB) a British Designer and Manufacturer of Low Voltage Control and Instrumentation products for the electrical industry.

www.foxtamcontrols.co.uk

Was thinking I could change the current switches to momentary to toggle the state, and use the computer control for on/off separately. Maybe even an option to pulse "off" at 9am every day just in case someone forgot and left the lights on.