RAMPS1.4 - Heatbed wont heat up to 100C February 10, 2015 10:03PM |
Registered: 10 years ago Posts: 12 |
Re: RAMPS1.4 - Heatbed wont heat up to 100C February 11, 2015 04:12AM |
Registered: 11 years ago Posts: 14,685 |
Re: RAMPS1.4 - Heatbed wont heat up to 100C February 11, 2015 04:37AM |
Registered: 10 years ago Posts: 12 |
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dc42
1. Measure the voltage appearing on the heat bed. If it is much lower than the 12V from your power supply, then you are losing too much in the cabling and/or the mosfet.
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dc42
2. You didn't say what size the heated bed is. If it is about 200mm square then a resistance of 1.8 ohms is rather high and you will need more voltage to get it hotter.
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dc42
3. As you have a LED supply, you can turn up the supply voltage. Caution: if you are using Arduino/RAMPS and you have an LCD screen attached with the backlight powered from 5V, then the voltage regulator on the Arduino will already be getting very hot, and you should use an external 5V regulator before you increase the voltage. Otherwise, you can turn the voltage up to 14V.
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dc42
4. Insulation under the bed will help.
Re: RAMPS1.4 - Heatbed wont heat up to 100C February 11, 2015 05:07AM |
Registered: 11 years ago Posts: 14,685 |
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skelator
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dc42
3. As you have a LED supply, you can turn up the supply voltage. Caution: if you are using Arduino/RAMPS and you have an LCD screen attached with the backlight powered from 5V, then the voltage regulator on the Arduino will already be getting very hot, and you should use an external 5V regulator before you increase the voltage. Otherwise, you can turn the voltage up to 14V.
noted I will need to look up on on how to do this, maybe I can just disable the backlight
Re: RAMPS1.4 - Heatbed wont heat up to 100C February 11, 2015 06:39AM |
Registered: 11 years ago Posts: 903 |
Re: RAMPS1.4 - Heatbed wont heat up to 100C February 11, 2015 06:52AM |
Registered: 11 years ago Posts: 14,685 |
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vreihen
If you want to eliminate the controller from your suspect list, just wire the heatbed directly to your 12V power supply for testing. If it can't reach 110C wired directly to the power supply, you know what the problem is.....
Re: RAMPS1.4 - Heatbed wont heat up to 100C February 11, 2015 07:31AM |
Registered: 10 years ago Posts: 12 |
Re: RAMPS1.4 - Heatbed wont heat up to 100C February 11, 2015 07:38AM |
Registered: 11 years ago Posts: 14,685 |
Re: RAMPS1.4 - Heatbed wont heat up to 100C February 11, 2015 07:46AM |
Registered: 10 years ago Posts: 12 |
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dc42
The stepper motor drivers are constant-current and can take much higher voltages than 12V (AFAIR they are rated at 35V). The capacitors on the RAMPS board may be rated at 16V, 25V or possibly 35V depending on your board. A simple way to drop the voltage to the fans from 14V to 12V is to put three 1N4001 or similar diodes in series with them.
Re: RAMPS1.4 - Heatbed wont heat up to 100C February 11, 2015 05:07PM |
Registered: 10 years ago Posts: 344 |
Re: RAMPS1.4 - Heatbed wont heat up to 100C February 11, 2015 08:37PM |
Registered: 10 years ago Posts: 12 |
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gforce1
Ohm's law: U(volts) = I(amps) x R(ohm). ==> I = U/R ==> I = 14/1,8 ==> I = 7,77 Amp.
Have measured the actual temperature, maybe your thermistor is misreading.
Re: RAMPS1.4 - Heatbed wont heat up to 100C February 12, 2015 04:31AM |
Registered: 11 years ago Posts: 14,685 |
Re: RAMPS1.4 - Heatbed wont heat up to 100C February 12, 2015 05:34AM |
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Re: RAMPS1.4 - Heatbed wont heat up to 100C February 15, 2015 09:23PM |
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Re: RAMPS1.4 - Heatbed wont heat up to 100C February 16, 2015 03:29AM |
Registered: 11 years ago Posts: 14,685 |
[SOLVED] RAMPS1.4 - Heatbed wont heat up to 100C February 16, 2015 03:33AM |
Registered: 10 years ago Posts: 12 |
Quote
dc42
You don't need to use PID control for the bed, and using it may make the mosfet run hotter. Leave it as bang-bang instead.
Re: [SOLVED] RAMPS1.4 - Heatbed wont heat up to 100C February 16, 2015 06:11AM |
Registered: 11 years ago Posts: 14,685 |
Re: [SOLVED] RAMPS1.4 - Heatbed wont heat up to 100C February 16, 2015 07:01AM |
Registered: 11 years ago Posts: 903 |
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skelator
...but first thing first I need to dry my filament
Re: RAMPS1.4 - Heatbed wont heat up to 100C July 29, 2015 01:50PM |
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Re: RAMPS1.4 - Heatbed wont heat up to 100C July 29, 2015 02:16PM |
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Re: RAMPS1.4 - Heatbed wont heat up to 100C July 29, 2015 02:37PM |
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Re: RAMPS1.4 - Heatbed wont heat up to 100C July 29, 2015 06:55PM |
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Re: RAMPS1.4 - Heatbed wont heat up to 100C July 29, 2015 07:49PM |
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Re: RAMPS1.4 - Heatbed wont heat up to 100C August 10, 2015 12:01PM |
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Re: RAMPS1.4 - Heatbed wont heat up to 100C August 13, 2015 02:51AM |
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Re: RAMPS1.4 - Heatbed wont heat up to 100C May 19, 2016 02:51AM |
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Re: RAMPS1.4 - Heatbed wont heat up to 100C November 30, 2022 09:10AM |
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