julianf
Member
- Messages
- 8,822
- Location
- devon, uk
The PID from china turned up a couple of days ago, so i dragged in the oven thats been lurking in the damp for ages, and found the two SSRs that ive had knocking about for years.
Oven electrics keep blowing the breakers. Its got a load of electronics on it which i was still using to control the fan, and i think the fault is somewhere on them (it was given to me as broken, but i didnt think that was the issue - its been some time though!)
Anyway, the first SSR turns out to be AC control, so no good for my PID.
Second one blinks away happily, then stops blinking.
Temp continues to rise. I assume hysterasis.
Its only after the sawdust thats accumulated in it starts smoking (again, in the lounge - its grim out, and theres no easy room at present) that i pull the plug, and discover that the SSR, whilst happily indicating that its switching, is, in fact, always closed.
To rub salt in the the wound, i think ive been storing those SSRs for at least 5 years...
(when it all works, ill put it in a larger box, and use it to bake powdercoat)
Oven electrics keep blowing the breakers. Its got a load of electronics on it which i was still using to control the fan, and i think the fault is somewhere on them (it was given to me as broken, but i didnt think that was the issue - its been some time though!)
Anyway, the first SSR turns out to be AC control, so no good for my PID.
Second one blinks away happily, then stops blinking.
Temp continues to rise. I assume hysterasis.
Its only after the sawdust thats accumulated in it starts smoking (again, in the lounge - its grim out, and theres no easy room at present) that i pull the plug, and discover that the SSR, whilst happily indicating that its switching, is, in fact, always closed.
To rub salt in the the wound, i think ive been storing those SSRs for at least 5 years...
(when it all works, ill put it in a larger box, and use it to bake powdercoat)
