Never reaches set temperature after dual nozzle upgrade April 02, 2015 02:17PM |
Registered: 9 years ago Posts: 191 |
Re: Never reaches set temperature after dual nozzle upgrade April 02, 2015 03:47PM |
Registered: 10 years ago Posts: 14,672 |
Re: Never reaches set temperature after dual nozzle upgrade April 02, 2015 04:38PM |
Registered: 9 years ago Posts: 191 |
Re: Never reaches set temperature after dual nozzle upgrade April 02, 2015 06:54PM |
Registered: 10 years ago Posts: 14,672 |
Re: Never reaches set temperature after dual nozzle upgrade April 03, 2015 01:44AM |
Registered: 9 years ago Posts: 191 |
Re: Never reaches set temperature after dual nozzle upgrade April 03, 2015 03:57AM |
Registered: 10 years ago Posts: 14,672 |
Re: Never reaches set temperature after dual nozzle upgrade April 03, 2015 05:26AM |
Registered: 9 years ago Posts: 191 |
Re: Never reaches set temperature after dual nozzle upgrade April 03, 2015 05:33AM |
Registered: 10 years ago Posts: 14,672 |
Re: Never reaches set temperature after dual nozzle upgrade April 03, 2015 07:09AM |
Registered: 9 years ago Posts: 191 |
Re: Never reaches set temperature after dual nozzle upgrade April 03, 2015 08:13AM |
Registered: 10 years ago Posts: 14,672 |
Quote
fotomas
Measured the old heater and the new:
Old 3.7 Ω
New 4.7 Ω
The old heater, delivered with the Original Ormerod 2 kit and the newer heater included in the dual nozzle (quick set) upgrade kit.
Regarding thermal characteristics; to me it looks like there is thinner and less metal between the heater block and the cooling block. If there is a difference the quick set nozzle should cool slower than the original nozzle. What I think could have a much greater impact is the tolerance of the hole for the heater. A small screw pressing on the heater would not have hurt.
Update:
After adding M310 S1.5, the last 5 degrees up to 220 are painfully slow. S1.5 does not seem to be the right or complete solution to this issue.
Re: Never reaches set temperature after dual nozzle upgrade April 03, 2015 10:24AM |
Registered: 9 years ago Posts: 1,159 |
Quote
dc42
Quote
fotomas
Measured the old heater and the new:
Old 3.7 Ω
New 4.7 Ω
The old heater, delivered with the Original Ormerod 2 kit and the newer heater included in the dual nozzle (quick set) upgrade kit.
Regarding thermal characteristics; to me it looks like there is thinner and less metal between the heater block and the cooling block. If there is a difference the quick set nozzle should cool slower than the original nozzle. What I think could have a much greater impact is the tolerance of the hole for the heater. A small screw pressing on the heater would not have hurt.
Update:
After adding M310 S1.5, the last 5 degrees up to 220 are painfully slow. S1.5 does not seem to be the right or complete solution to this issue.
So the new heaters are indeed less powerful than the old ones, and the ones I calibrated the default PID settings for (they were just over 3 ohms). I suggest you increase the T parameter to get those last 5 degrees faster.
Re: Never reaches set temperature after dual nozzle upgrade April 03, 2015 10:31AM |
Registered: 10 years ago Posts: 14,672 |
Re: Never reaches set temperature after dual nozzle upgrade April 03, 2015 10:45AM |
Registered: 10 years ago Posts: 14,672 |
Re: Never reaches set temperature after dual nozzle upgrade April 03, 2015 11:19AM |
Registered: 9 years ago Posts: 1,159 |
Re: Never reaches set temperature after dual nozzle upgrade April 03, 2015 01:40PM |
Registered: 10 years ago Posts: 14,672 |
Quote
dougal1957
The Bed is heated with An AC Pad the thermistor reports room temp to within 1 degree or so (I can live with that) if I command it to 110degrees it gets to about 90 (Panel shows 110 and stable but Thermocouple on top of the bed shows 90) any suggestions?
Re: Never reaches set temperature after dual nozzle upgrade April 03, 2015 01:54PM |
Registered: 9 years ago Posts: 1,159 |
Quote
dc42
Quote
dougal1957
The Bed is heated with An AC Pad the thermistor reports room temp to within 1 degree or so (I can live with that) if I command it to 110degrees it gets to about 90 (Panel shows 110 and stable but Thermocouple on top of the bed shows 90) any suggestions?
The possibilities I can think of are:
1. You don't have the correct thermistor parameters set in the M305 command. If it is reading correctly at room temperature, then you presumably have the R25 value right; but do you know the correct B value?
2. The thermistor is reading the temperature in the midst of the heating elements, but that is 20C hotter than on top of the glass. You are probably getting 10C temperature drop across the glass anyway. If you place an insulating mat on top of the glass and thermocouple, the temperatures will probably converge.
3. Thermocouples don't read accurately when in contact with surfaces that are poor conductors of heat, such as glass, because heat gets conducted away through the wires. So the thermistor is under-reading.
Re: Never reaches set temperature after dual nozzle upgrade April 03, 2015 02:19PM |
Registered: 10 years ago Posts: 14,672 |
Re: Never reaches set temperature after dual nozzle upgrade April 03, 2015 02:54PM |
Registered: 9 years ago Posts: 1,159 |
Quote
dc42
It sounds rather like the one I just received (also 300mm), except that I specified 350W @ 230V instead of 500W. I hope that's enough power. How long does yours take to reach 110C from cold?