Good point. I have a PWM on my system for boiling, so I always forget about the manual boil mode in these discussions.The MyPins work OK but they're much more difficult to program and don't have a manual mode to control boils.
What you are explaining is what appears to be normal PID operation. You do realize that the goal of the PID is to hit the requested temperature without overshooting it? When you get your system built you need to tune your PIDs to work with your system. There should be an autotune feature. The PID uses calculus to determine the heat curve (how much heat your rig can put into the system). If it ran full bore then turned off at the setpoint then it would overshoot (normal thermostat functions like this). With a PID, when the setpoint is near, the PID will start modulating on/off duration in the Cycle time (usually 2 seconds) so that it slowly reaches the setpoint without overshooting it. When it starts flashing it will be on longer than off, then as it gets closer it will be off longer than on. SSR's were designed to be cycled frequently. It's for this reason they exist as they are better at this than mechanical relays (aka contactors).I too, have a TA6 and I'm having problems with the programing and of course, there is no help from the company that sold it or the manufacturer.
I have been able to wire it correctly, and set a heating temp. When checking to see if it's working, I am using a light buld instead of a heating element.
when it is heating towards the required temp, the light stays on. But, within 10* of the target temp, the light bulb begins to flash untill it reaches temp and then shuts off.
I realize that if the bulb is flashing on and off, then the current would be doing the same to a heating element, and worse, it will cause premature failure to the solid state relay.
Can somone please tell me where I am going wrong???
Thanks in advance,
There shouldn't be any manual programming involved. Use auto tune to self-program. I believe you hold in the "<</AT" button for 3 secs to initiate auto tune. The AT light will come on during auto tuning.I too, have a TA6 and I'm having problems with the programing and of course, there is no help from the company that sold it or the manufacturer.
would you care to help me with the same unit(s)? I have no experience with programining these and mine cycles on/off every second when it is with in 10 degrees of the target temp.I have 2 of the MyPin TA6 Pids that come with the type K and the 25A SSR, they've been working OK ...as I recall the package was $35