vas
Well-Known Member
OK,
just an info/warning for anyone playing with them. Got two FOTEK (knockoffs) SSR-40DD which means solid state relay, 40A DC trigger, DC used to run the el. lift pump and the starter on my generator.
They are driven at 3V3 from a teensy (arduino like thingie). FOTEK specs say 3-32VDC input, 5-60VDC output, -40 to +70C operation range.
They worked fine for a couple of years, last week that the temps dropped to 4-5C in the e/r they are dead.
Puzzled, check wiring, all fine so today went with a hot air gun at them for 10-15secs and they worked fine
so, if anyone sees fancy behaviour with such devices driven at the lower end of the "official" range, it may be the ambient temp to blame!
Now, going to drive them via a transistor which is tbh absolutely silly, having a plc, driving a transitor, which is then driving effectively another transistor... oh, well don't really need the geny at these temps, so could well leave as is!
V.
just an info/warning for anyone playing with them. Got two FOTEK (knockoffs) SSR-40DD which means solid state relay, 40A DC trigger, DC used to run the el. lift pump and the starter on my generator.
They are driven at 3V3 from a teensy (arduino like thingie). FOTEK specs say 3-32VDC input, 5-60VDC output, -40 to +70C operation range.
They worked fine for a couple of years, last week that the temps dropped to 4-5C in the e/r they are dead.
Puzzled, check wiring, all fine so today went with a hot air gun at them for 10-15secs and they worked fine
so, if anyone sees fancy behaviour with such devices driven at the lower end of the "official" range, it may be the ambient temp to blame!
Now, going to drive them via a transistor which is tbh absolutely silly, having a plc, driving a transitor, which is then driving effectively another transistor... oh, well don't really need the geny at these temps, so could well leave as is!
V.
