PID Controller Error
When I turn on the injection moulder, the PV setting comes up with’HHH’. I can’t find anything in the manual, does anyone have a clue what this means?
All the best
I bought a crappy PID controller off ebay in a pack (+ thermocouple + ssr). Still can’t calibrate it to work. As I am getting the same ‘hhh’ message, I would be interested in finding that out as well.
It means the temperature input to the PID is out of range. Check that the setting for the thermocouple type matches the thermocouple you are using (probably type k) and that it’s properly connected. If it’s set to NTC thermistor the thermocouple is effectively a dead short across the input giving a maximum high reading.
Also check the thermocouple for continuity, if it has crimped on spade connectors these can sometimes be bad.
I just actually solved this problem myself and the solution was simpler than I expected.
Try swapping the positive and negative connections from your thermocouple on the back of the PID.
Even if it is labeled opposite, its worth a try.
we tried it and all of a sudden it started working.
Got the idea from an old timers advice on another forum.
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