Posts made by brumster

@OwenD that is awesome, thankyou! I will wire it up in order to try this and see how it goes... cheers...

@T3P3Tony hiya, thanks for the reply. The PTC doesn't have a sensor on it no, it is ultimately controlled by the enclosure temperature sensor which is mid-way in the enclosure - it will control the power to the PTC heater to maintain the enclosure temperature, cycling it on and off as necessary.

I think I'll just rely on the fan being wired into the 12v signal that activates the solid-state relay for the PTC. That way, PTC is on means fan is on. Accepted that there will be a short period of switching the PTC off where it's hot with no fan, but I suspect it will be OK.

Hi peeps, just a quick one - is there any way I can configure a fan output to turn off after a time delay from a related heater output turning off?

I've got a 12v fan that will be on a 240v PTC enclosure heater. The fan needs to always be running when the PTC has power to it, which is easy enough as I could drive the 12v fan from the heater output. But what would be cool (no pun intended) would be if, when the heater output turns off (as the enclosure is up to temperature) I could "run on" the 12v fan for 30 seconds or so, just to provide a little passive cooling of the PTC element afterwards.

No big deal if not, just wondered before I started wiring it up.... (nb: I don't have a temperature probe on the PTC itself, the enclosure heating will be controlled by a PTC sensor half-way up the enclosure measuring ambient temperature)