PID control combined with SSR
Posted: Sun Aug 12, 2012 10:59 pm
This may be an obvious question but I can't seem to make sense of it.
I wish to control two pumps for circulating cooling and heating fluids amongst a few fermenters that I have been building. I will be using the BCS for this purpose and I have the pumps connected via SSRs.
My question is, how is it possible for the BCS to implement proper PID control (varied output signal, ie varied voltage ) when the output signal must go through an SSR which can only be on or off…?
Does this just mean that the ‘PID’ cycles between on and off within a specified time range? So as the target is approached the PID cycles closer and closer to the minimum cycling period?
Thanks in advance for your help!
I wish to control two pumps for circulating cooling and heating fluids amongst a few fermenters that I have been building. I will be using the BCS for this purpose and I have the pumps connected via SSRs.
My question is, how is it possible for the BCS to implement proper PID control (varied output signal, ie varied voltage ) when the output signal must go through an SSR which can only be on or off…?
Does this just mean that the ‘PID’ cycles between on and off within a specified time range? So as the target is approached the PID cycles closer and closer to the minimum cycling period?
Thanks in advance for your help!