FrankS Posted September 18, 2018 Share Posted September 18, 2018 Hi all I've just got my hands on a qmaster-lite which I have hooked up to my UDS. I'm trying to smoke a small pork shoulder and the temp is swinging up to 260f and then down to 240f at which time the fan has raised the temp to 260f again. I'm aiming for 250f. Quote Link to comment Share on other sites More sharing options...
Justin Posted September 18, 2018 Share Posted September 18, 2018 That is fine. Quote Link to comment Share on other sites More sharing options...
Justin Posted September 18, 2018 Share Posted September 18, 2018 Welcome to the forum. Quote Link to comment Share on other sites More sharing options...
FrankS Posted September 18, 2018 Author Share Posted September 18, 2018 2 minutes ago, Justin said: That is fine. 2 minutes ago, Justin said: Welcome to the forum. Thanks matey Quote Link to comment Share on other sites More sharing options...
Justin Posted September 18, 2018 Share Posted September 18, 2018 Can will you post yourself in roll call when you get a moment please mate. Let us know a bit about yourself and where you are. Thx Quote Link to comment Share on other sites More sharing options...
Smokin Monkey Posted September 18, 2018 Share Posted September 18, 2018 Hi Frank, Welcome to the Forum. 10’C swing is not the best, but 5’C each side is not bad. Just a test, have you ever tested your domestic Oven, to see what variation it has. Quote Link to comment Share on other sites More sharing options...
FrankS Posted September 18, 2018 Author Share Posted September 18, 2018 3 minutes ago, Smokin Monkey said: Hi Frank, Welcome to the Forum. 10’C swing is not the best, but 5’C each side is not bad. Just a test, have you ever tested your domestic Oven, to see what variation it has. Oven? Is that the thing the mrs uses in the kitchen? 2 Quote Link to comment Share on other sites More sharing options...
Justin Posted September 18, 2018 Share Posted September 18, 2018 Smokin I think you are talking plus minus 5 centigrade. Yes? Quote Link to comment Share on other sites More sharing options...
Smokin Monkey Posted September 18, 2018 Share Posted September 18, 2018 Yes, next to fridge near the sink! ? We all get preoccupied with our Pits running to an exact temperature. But one thought, is how your Q-Lite is set up. Will find link to Wangs (designer) site to show what the best parameters are. Quote Link to comment Share on other sites More sharing options...
Smokin Monkey Posted September 18, 2018 Share Posted September 18, 2018 Just now, Justin said: Smokin I think you are talking plus minus 5 centigrade. Yes? Yes. Quote Link to comment Share on other sites More sharing options...
Justin Posted September 18, 2018 Share Posted September 18, 2018 3 minutes ago, FrankS said: Oven? Is that the thing the mrs uses in the kitchen? The point is I think even domestic oven has a tolerance variation so it is reasonable to expect a variation in a new. Quote Link to comment Share on other sites More sharing options...
FrankS Posted September 18, 2018 Author Share Posted September 18, 2018 1 minute ago, Smokin Monkey said: Yes, next to fridge near the sink! ? We all get preoccupied with our Pits running to an exact temperature. But one thought, is how your Q-Lite is set up. Will find link to Wangs (designer) site to show what the best parameters are. that would be great! Quote Link to comment Share on other sites More sharing options...
Justin Posted September 18, 2018 Share Posted September 18, 2018 Just now, Smokin Monkey said: Yes. Frank is talking plus minus 10 Farenheit Quote Link to comment Share on other sites More sharing options...
Smokin Monkey Posted September 18, 2018 Share Posted September 18, 2018 I understand. 240’F = 115’C 260’F = 126’C 11’C difference Quote Link to comment Share on other sites More sharing options...
Justin Posted September 18, 2018 Share Posted September 18, 2018 Same thing then. Frank you are fine. Let us know how it turns out. Photo will be nice Quote Link to comment Share on other sites More sharing options...
Smokin Monkey Posted September 18, 2018 Share Posted September 18, 2018 Take a look at this thread, settings are near the bottom of page. http://www.woodsmokeforum.uk/topic/148-qmaster-lite-atc-thoughts-and-opinions/?tab=comments#comment-396 Quote Link to comment Share on other sites More sharing options...
FrankS Posted September 18, 2018 Author Share Posted September 18, 2018 41 minutes ago, Smokin Monkey said: Take a look at this thread, settings are near the bottom of page. http://www.woodsmokeforum.uk/topic/148-qmaster-lite-atc-thoughts-and-opinions/?tab=comments#comment-396 Have you any idea what these mean? P= Proportional Value. Setting 30 Seconds I= Integeral Value. Setting 240 Seconds D= Derivative Value. Setting 60 Seconds Quote Link to comment Share on other sites More sharing options...
Smokin Monkey Posted September 18, 2018 Share Posted September 18, 2018 Ok, it’s how quick it looks at what’s happening and reacts. It is self learning. This is the definition. Term P is proportional to the current value of the SP − PV error e(t). For example, if the error is large and positive, the control output will be proportionately large and positive, taking into account the gain factor "K". Using proportional control alone in a process with compensation such as temperature control, will result in an error between the setpoint and the actual process value, because it requires an error to generate the proportional response. If there is no error, there is no corrective response.[1] Term I accounts for past values of the SP − PV error and integrates them over time to produce the I term. For example, if there is a residual SP − PV error after the application of proportional control, the integral term seeks to eliminate the residual error by adding a control effect due to the historic cumulative value of the error. When the error is eliminated, the integral term will cease to grow. This will result in the proportional effect diminishing as the error decreases, but this is compensated for by the growing integral effect. Term D is a best estimate of the future trend of the SP − PV error, based on its current rate of change. It is sometimes called "anticipatory control", as it is effectively seeking to reduce the effect of the SP − PV error by exerting a control influence generated by the rate of error change. The more rapid the change, the greater the controlling or dampening effect.[2]. Sounds very daunting, but it’s getting a balance between all three that gives a smooth temperature control. Too close and its erratic, too wide and high temperature fluctuations. Hope this helps?! ? Quote Link to comment Share on other sites More sharing options...
FrankS Posted September 18, 2018 Author Share Posted September 18, 2018 1 minute ago, Smokin Monkey said: Ok, it’s how quick it looks at what’s happening and reacts. It is self learning. This is the definition. Term P is proportional to the current value of the SP − PV error e(t). For example, if the error is large and positive, the control output will be proportionately large and positive, taking into account the gain factor "K". Using proportional control alone in a process with compensation such as temperature control, will result in an error between the setpoint and the actual process value, because it requires an error to generate the proportional response. If there is no error, there is no corrective response.[1] Term I accounts for past values of the SP − PV error and integrates them over time to produce the I term. For example, if there is a residual SP − PV error after the application of proportional control, the integral term seeks to eliminate the residual error by adding a control effect due to the historic cumulative value of the error. When the error is eliminated, the integral term will cease to grow. This will result in the proportional effect diminishing as the error decreases, but this is compensated for by the growing integral effect. Term D is a best estimate of the future trend of the SP − PV error, based on its current rate of change. It is sometimes called "anticipatory control", as it is effectively seeking to reduce the effect of the SP − PV error by exerting a control influence generated by the rate of error change. The more rapid the change, the greater the controlling or dampening effect.[2]. Sounds very daunting, but it’s getting a balance between all three that gives a smooth temperature control. Too close and its erratic, too wide and high temperature fluctuations. Hope this helps?! ? :O 1 Quote Link to comment Share on other sites More sharing options...
Smokin Monkey Posted September 18, 2018 Share Posted September 18, 2018 Technical I know. Do you need to understand? No I need to know for work, otherwise it’s like being told to learn Algebra, when are you going to use it? Quote Link to comment Share on other sites More sharing options...
Smokin Monkey Posted September 18, 2018 Share Posted September 18, 2018 This is what it’s doing This is what it is trying to achieve, a smoother wave. Or for simplicity, smaller temperature difference. Quote Link to comment Share on other sites More sharing options...
FrankS Posted September 18, 2018 Author Share Posted September 18, 2018 So confusing lol 1 Quote Link to comment Share on other sites More sharing options...
Smokin Monkey Posted September 18, 2018 Share Posted September 18, 2018 Quick question, was your Q-Lite new or second hand? Quote Link to comment Share on other sites More sharing options...
FrankS Posted September 18, 2018 Author Share Posted September 18, 2018 Just now, Smokin Monkey said: Quick question, was your Q-Lite new or second hand? new mate Quote Link to comment Share on other sites More sharing options...
Smokin Monkey Posted September 18, 2018 Share Posted September 18, 2018 So it should be set up OK. Are you using a separate device to check the UDS temperature or relaying on the Q-Lite? Quote Link to comment Share on other sites More sharing options...
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