Please could somebody help an electronics novice!
I am building an electronic controller for my pottery kiln; basically it is a mains powered PID temperature controller that operates solid state relays to turn on/off and regulate the high current load to kiln elements.
There are two temperature controlled (settable) alarm outputs on the PID that service low current relays which are used to feed simmerstats where the loads provide an alternate feed to the solid state relay. The purpose of the simmerstats is important to ramp the kiln loading in set stages. In principle the logic works fine.
The difficulty that I am having is the load to the simmerstats produce voltage spikes as the bimetallic strips make and break and these spikes are upsetting the PID. I've tried putting 470pf ceramics across the simmerstat feeds and that has perhaps improved things a little but not solved the problem.
Could anybody help me with a better solution? Thanks
I am building an electronic controller for my pottery kiln; basically it is a mains powered PID temperature controller that operates solid state relays to turn on/off and regulate the high current load to kiln elements.
There are two temperature controlled (settable) alarm outputs on the PID that service low current relays which are used to feed simmerstats where the loads provide an alternate feed to the solid state relay. The purpose of the simmerstats is important to ramp the kiln loading in set stages. In principle the logic works fine.
The difficulty that I am having is the load to the simmerstats produce voltage spikes as the bimetallic strips make and break and these spikes are upsetting the PID. I've tried putting 470pf ceramics across the simmerstat feeds and that has perhaps improved things a little but not solved the problem.
Could anybody help me with a better solution? Thanks