Failsafe for Fan Cooling

HydroDC

HydroDC

Well-Known Member
I use CPU coolers for my DIY light. To protect the COBs in the event of a failure of the 12V DC power supply for the fans, I'd like to add a relay switch so that if the PSU fails, the COBs won't get power. I know little about these relays. Would something like that shown below be a good choice or is there something else I should consider?

61DN0LthivL._SL1000_.jpg
 
salmonetin

salmonetin

Well-Known Member
...pardon HydroC... any electric scheme for do that with an Solid State Rele?

...i saw some info on ssr maybe help you a bit...

http://www.omron.com/ecb/products/pdf/precautions_ssr.pdf

http://www.digikey.com/Web Export/Supplier Content/Crydom_172/PDF/crydom-techtip-why-use-ssr.pdf?redirected=1

http://www.ssousa.com/application-notes/AppNote040_Solid-State-Relays-vs-Electromechanical-Relays.pdf

...i saw other info about ssr and arduinos... but this time let atduino way out....

...but its only my inexpert opinion...

saludos
 
salmonetin

salmonetin

Well-Known Member
...a thermal switch can activate an SSR?... if yes... how to?...

...rufus... some example on thermal switch... ?... i cant remember but i saw a guod answer with something similar... or maybe a thermal switch... but i cant remember the thread or post... im too bad searching things on riu... sorry..

saludos
 
R

rufus01

Well-Known Member
salmonetin said:
...a thermal switch can activate an SSR?... if yes... how to?...

...rufus... some example on thermal switch... ?... i cant remember but i saw a guod answer with something similar... or maybe a thermal switch... but i cant remember the thread or post... im too bad searching things on riu... sorry..

saludos
Click to expand...
No, a thermal switch is a switch like the one used for turning on/off any house light, he just operate when a rated temperature is reached.
A relay is an electro magnetic switch that can be activated by the presence of a lover volage, like the fans power supply in this case.
If the power supply fail the switch will open turning off the driver.
 
salmonetin

salmonetin

Well-Known Member
please atomizer can you share more info about disc thermostat and thermal fuse used with reles?

thanks in advance

...i saw your pic... brand?... model?...

...semi-autoanswer... the disc thermostat on pic its a Selco

3/4” Disc Thermostat - Manual Reset - model: SES-L200M

...Wilson... recuerdame mirar cosas del fusible termico... la peña no esta por la labor... asi que Wilson te invito a infusion y petardo en la cueva....

saludos
 
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salmonetin

salmonetin

Well-Known Member
...i think i can use all... at the same time.... ...seems to me its a similar way to industrial contactors way... .. but now im only learning your hows to about these hardware pieces...

...thanks a lot Rufus01... but please following sharing more info... electrical squemes ... pros and contras..

...i like a lot learn on all protections way... ...sometimes i need refresh the info with others opinions ... other hardwares pieces... other how too...

...thanks to all for sharing...

saludos
 
R

rufus01

Well-Known Member
salmonetin said:
...disk thermostat or thermal fuse or thermal switch... for my pov....actuators on the control side of reles o contactors way... but repeat... its only my personal opinion...
Click to expand...
You do not need any actuator for the relay, he will be powered directly by the 12v power supply wired in parallel with the fans.
When powered the contact is close and the Led Driver is powered.
When/if the 12v power supply fail, the relay will be released and the contact open so the Led Driver is turned OFF.
So you need a realy "normally open" that when receive some VDC change the state to "close".
Is really very simple but if you feel the need i can open MSPaint ad draw something :bigjoint:
 
dandyrandy

dandyrandy

Well-Known Member
I used a 145deg thermal on each arctic 11. Normally closed.It's's in the relay coil circuit. 12v supply drives fans and picks up relay. Ac to led supplies is applied through relay contacts. Also have a sail switch on the blower output. No air, no lights. In process of changing design so air circ fan runs only when lights off. I get enough from the arctic 11's (9) when the lights are on. Also need to reduce air flow through carbon filter when lights are off. Need to modify a controller so the speed pots are switched using different pots with relays. I only need a gentle (maybe 40 cfm) with lights out. I think I need to look into a pic controller and write some code.
 
R

rufus01

Well-Known Member
The disk thermostat is even simpler, you just connect it somwere in your LED driver main fase input.
Probably it's a good option for people that put the drivers nearby the lamp/dissipator.
If you are running all the powers supply/drivers outside the grow room is easier to stick with the relay option.

P.S. with the disk thermostat, having the main AC connected near to the heatsink require a very good cable/connector managment and possibly a good grounding.
 
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