I'm completely frstrated with an SSR design I'm working on. I'm hoping someone can tell me what I'm missing.
Facts: I'm working with a Potter & Brumfield SSR-240D50. I'm trying to switch a simple resistive heating coil that comes out at a little over 4 amps at 124V.
Initially I had this hooked to a pin on my printer port. I have other, much smaller, SSR's that I run this way. For some of my tests I put a 9volt battery across the drive lines.
Wiring: I have, quite literally, an electrical cord that I spliced the SSR into. One side of the cut is on pin 1, the other side is on pin 2 (which are labeled 120/240vac).
Observations: Whenever the cord is plugged in I read 124v at the plugged. There isn't enough current to drive anything, but there is energy. This concerns me.
Tests/Result: LPT: First test was totally dead. LPT: Second test I plugged in a light bulb, worked perfect for many cycles. LPT: OK, I hooked up my heating coil... dead. 9V Batt.: Back to the light bulb... works (here I'm pretty frustrated) LPT: Hook it back up to my heating coil... Works!!! LPT: Do some tuning on my code that drives the device, run it again... Works intermittently, once turned off it wouldn't always come back on.
Dismantle, hook drive lines directly to 9 volts... Dead Never works again.
(Step 10 - Hit the newsgroups atfind little of value, deicde to post)
Can anyone see what I'm missing? I have similar designs running on 3amp SSR. Is it possible that I have a bad SSR.
Here is the spec sheet for the SSR: