Alright folks. Apparently i have exceeded my understanding of all things electric.
I am using a PID to control 2 4500w 240v water heater elements. These draw 17amps a piece i believe.
They are wired parrallel into one 40a SSR. Which i thought would be OK.
When i tested the system everything seemed OK. As it approached the set value of 90 degrees the PID starts to "pulse" the output to the SSR, as it over shot to about 95 degrees the pulses became slower and slower until the until SSR was commanded "off". Right about this time, fireworks. Sparks and magic smoke let out of the SSR.
The heatsink was very hot when i checked it. Im stumped. 17 + 17 = 34. i thought i was good?
Can anyone please tell me what i did wrong? I dont want to order another SSR just to smoke it too.
can provide a wiring diagram if need be.
Thanks!!
p.s. mypin ta4, pt100 rtd, 40a ssr all ebay brand.
I am using a PID to control 2 4500w 240v water heater elements. These draw 17amps a piece i believe.
They are wired parrallel into one 40a SSR. Which i thought would be OK.
When i tested the system everything seemed OK. As it approached the set value of 90 degrees the PID starts to "pulse" the output to the SSR, as it over shot to about 95 degrees the pulses became slower and slower until the until SSR was commanded "off". Right about this time, fireworks. Sparks and magic smoke let out of the SSR.
The heatsink was very hot when i checked it. Im stumped. 17 + 17 = 34. i thought i was good?
Can anyone please tell me what i did wrong? I dont want to order another SSR just to smoke it too.
can provide a wiring diagram if need be.
Thanks!!
p.s. mypin ta4, pt100 rtd, 40a ssr all ebay brand.