sideshowbob Senior Member Joined: 28 Feb 2012 Posts: 8 Location: Newport, South wales Expertise: Just starting
Posted Thu May 3, 2012, 1:34am Subject: What's your PID Parameters? Settings? Auto-tune is not working..
Hi, I recently bought a REX-C100 clone from china and just finished wiring everything. I downloaded the instructions for the original Japanese model but it's quite different to my PID considering that it's only a copy... Also I removed the built in SSR and installed an external one because the built in one would not be able to handle the load.
The PID is triggering the SSR and my Gaggia Baby 06 just fine with a stable increase in temperature.
BUT, it will not auto-tune... When I turn on the auto tune feature the external light blinks but after 20 to almost an hour nothing happens it does not turn off and just still blinks and there are no changes in the stock parameters.
When I enter a set value like 100C the temperature sometime stays at 105C or even reaches 130-140C
I suspect because if the fact that the built-in ssr was removed the auto-tune feature is not functioning, that only leaves me to manually tune the PID which I am not good at...
Can someone please give me the parameters for their PID so I will have a basis... some parameters I have changed base on reading some forums here and there and reading the vague instructions but most of them I really have no idea what to put
Currently here are my Parameters:
SYMBOL = NAME = VALUE SV = Setting Value = 105 AL1 = Alarm 1 = 130 P = Proportional Band = 6 I = Integral Time = 120 d = Derivative = 23 Ar = Anti-reset Windup = 50 r = Heat-site proportioning Cycle = 20 Sc = ?? = 0
Secondary Parameters: SYMBOL = NAME = VALUE = DESCRIPTION SL1 = input type selection = 1 = K type input SL2 = temp unit and cooling type = 0 = Centigrade, Air Cooling SL4 = Alarm Type Selection = 1 = Deviation High Alarm SL10 = ?? = 1 = ?? Cod = ?? = -1 = ??
I am not sure what you mean about removing the built in SSR and using an external one. I have an Auber PID. My SSR output is the PID output to the SSR and other outputs are alarm, on off type. To use the PID settings and autotune, the SSR circuit is used as it is the one controlled by PID input. My PID sends a signal to the SSR, switch side, to turn the load side on and off, controlled by PID parameters. Alarm, on and off, functions may also be used for a set value, but really just click on and off, not proportional integral derivative. The alarm settings also turn the SSR switch side on and off.
Some PIDs have a limited current SSR built in. I do not have one of these, but wonder if the internal SSR is used to run an external SSR when more load is needed. If not done that way, then there must be another PID, not alarm, output to the SSR.
macmata Senior Member Joined: 15 Aug 2012 Posts: 1 Location: montreal Expertise: I love coffee
Posted Wed Aug 15, 2012, 5:47pm Subject: Re: What's your PID Parameters? Settings? Auto-tune is not working..
I have been using the same (REX-C100 clone) PID for 2 days now. I kept the original SSR ( it is rated for 10amp and 125AC) that is inside. Up to now I get get a stable temp (96 Celsius) in 5 minute or so. I'not using any other SSR than the one inside. I used the auto tuning option ( it took 30 minutes )
Setting or P80 I360 D80 R60 other than that, I'm using the stock setting.
My espresso machine is an Isomac Venus
The auto tune will work this way ( well for me ?!? up to now )
First thing I did was to tune the pid to a lower temps (80 Celsius) -1 then pid the heated to 140 the down to 70 -2 then to 120 down 70 -3 then 115 then 80
then it was done.
And I did the same again but raise the temp to 96 and it follow the same pattern rise and down 3 time ...
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