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Loading bay traffic light

Discuss Loading bay traffic light in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net

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tomspark93

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I've been asked to install some 24v red/green traffic lights for some loading bays. Basically when the shutter doors go up the lights need to turn red and then when they go down they need to turn back to green to signal the lorry driver it's safe to pull away from the dock.

Has anybody installed these before and know the best way to do them?

I've attached my idea and would like to know if this would be a suitable solution? If it is then what kind of relay would I need as I'm not really familiar with them?

Cheers,

Tom

[ElectriciansForums.net] Loading bay traffic light
 
Any single pole double throw relay would do that, most relays are double pole anyway. Just depends on the load, I'd go with the octal relay.

So thing like this will handle 2 Amps
2903315 | Phoenix Contact DPDT DIN Rail Non-Latching Relay, 24V dc Coil, 2 A | Phoenix Contact - http://uk.rs-online.com/web/p/products/7943702/?grossPrice=Y&cm_mmc=UK-PLA-_-google-_-PLA_UK_EN_Relays-_-General_Purpose_Relays&mkwid=sHFzzlkoS_dt%7Cpcrid%7C88057060323%7Cpkw%7C%7Cpmt%7C%7Cprd%7C7943702&gclid=EAIaIQobChMI3uf7tafP1QIVwrDtCh2Z1w9vEAQYCCABEgJUVPD_BwE

Or this which is 10amps


MKS2PI DC24 | Omron DPDT PCB Mount Non-Latching Relay, 24V dc Coil, 10 A | Omron - http://uk.rs-online.com/web/p/products/0536922/?grossPrice=Y&cm_mmc=UK-PLA-_-google-_-PLA_UK_EN_Relays-_-General_Purpose_Relays&mkwid=sHVoruO0K_dt%7Cpcrid%7C88057060323%7Cpkw%7C%7Cpmt%7C%7Cprd%7C0536922&gclid=EAIaIQobChMI1qXS1qjP1QIVrbvtCh3dfQ0IEAQYAiABEgIUcfD_BwE

Fit in in a box with some Din rail and a Din rail mounted power supply with fused Din rail terminals.
 
You need to think about how this signalling system could fail and arrange your door contacts and relay contacts wired logic so that it fails leaving a safe indication to the driver of a Red light meaning 'Stop' or no Green light meaning not 'Safe to Move off'.

So, possible failures are:

1. the shutter door contacts.
2. the relay.
3. the relay contacts.
3. the power supply.
4. the fusing (non shown yet).
5. wiring damage.
6. lamp failure.
 
Also it may be a good idea to have some sort of timer in there, so the door needs to be closed a couple of seconds before green, goes instantly red when it opens.

If the limit fails the red lamp needs to come on.
 
What are you intending on using to sense the roller door is closed, a magnetic reed switch as used on security alarm systems?
 
Maybe they should think of the person inside closing the door presses a button when all is good to make the light go green and so on rather than rely on an automated process?
 
Thanks for the replies so far, a lot of Interesting points!
Vortigern said:
Maybe they should think of the person inside closing the door presses a button when all is good to make the light go green and so on rather than rely on an automated process?
Click to expand...

Already suggested a switch so in one position the lights are red and the other position they are green but they want a "fool proof" system so that they don't just get left on.

Rocboni said:
What are you intending on using to sense the roller door is closed, a magnetic reed switch as used on security alarm systems?
Click to expand...
Yes I was thinking about using a heavy duty shutter door contact
 
As opposed to fabricating your own system just contact companies which produce these lights who can provide controls which integrate with the shutter controls. This would ensure any safety requirements are complied with.
 
westward10 said:
As opposed to fabricating your own system just contact companies which produce these lights who can provide controls which integrate with the shutter controls. This would ensure any safety requirements are complied with.
Click to expand...
That's one of the questions I meant to get across in the op as I'd much prefer that for piece of mind/ease of install/quoting. I was wondering if anyone could recommend something?
 

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