Heated Bed is not heating

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Heated Bed is not heating

Postby venkei » 2015-Dec-Mon-06-Dec

Hello All,
Some one please help me regarding heated bed.
Installed new heated bed with thermostor to my printrbot metal plus, but unfortunately heated bed not working. I gave temperature settings in simplify3d as
Primary Extruder: T0: 215
Heated Bed: T1: 70
When i give print, it will not start printing. Unfortunately extruder temperature coming down and heated bed temperature shows 0
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Heated Bed is not heating

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Re: Heated Bed is not heating

Postby RetireeJay » 2015-Dec-Mon-07-Dec

If the heated bed temperature shows zero, then you don't have a good connection to the thermistor; it's an open circuit. And as a matter of safety, the firmware won't allow you to heat the bed unless you have at least a reasonable reading from the thermistor. (Same goes for the extruder). Zero degrees indicates an open circuit; temperature over 300C indicates a short circuit, and either condition prevents operation.
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Printrbot Plus operational January 2013
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Re: Heated Bed is not heating

Postby chengal » 2015-Dec-Mon-08-Dec

Thanks a lot Jay,
Iam checking thermistor connections, but i want to know the value of resistor for thermistor.
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Re: Heated Bed is not heating

Postby RetireeJay » 2015-Dec-Mon-09-Dec

At room temperature, it's somewhere close to 100K ohms.
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Printrbot Plus operational January 2013
Brass threaded rods (5/16" X 18) & nuts for Z axis
GT2 belts & pulleys
Cable chain to reduce probability of fatigue failure in wires
E3D V5 Hot End, 0.4mm nozzle, also 0.8 and 0.25 in use occasionally
PB fan mount + 40mm fan -- using printed mount adapter, not the E3D supplied fan
Injection molded extruder gears
Optical Z "endstop" (custom designed and built)
Have used many pounds of T-Glase filament. Now also doing some work with Ninjaflex SemiFlex
Print on glass with Scotch Craft Stick or other glue stick
"My next printer is..." Prusa i3 MK3
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Re: Heated Bed is not heating

Postby Mooselake » 2015-Dec-Mon-13-Dec

Hi, Venkei/Chengal! Welcome to the forum!

It looks like you're posting from Kuwait, and you may be our first member from there. Are you having problems that made you need to create two different accounts from the same IP address?

Kirk
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Re: Heated Bed is not heating

Postby chengal » 2015-Dec-Tue-06-Dec

Mr.Jay,
I used 100K ohms thermistor, but still it is not heating. Is there any issue with settings? If yes please let me know the settings as iam using simplify3d.
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Re: Heated Bed is not heating

Postby RetireeJay » 2015-Dec-Tue-07-Dec

I don't have Simplify3D, so I'm not sure of the settings. But let's verify something.

You should have some kind of a User Interface or Status screen that shows you the state of your printer: where it is in X, Y, Z, and what the temperatures are for both the heated bed and the extruder. When no heat has been turned on, both the heated bed and the extruder should read about room temperature, that is in the range of 20C to 30C. Ideally, they would be identical, and accurate, but in reality the circuit is optimized for accuracy at higher temperatures so there is some uncertainty at room temp. However, zero C would mean you have a bad connection somewhere. Make sure you have the bed's thermistor plugged in to the correct header on the board.
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Printrbot Plus operational January 2013
Brass threaded rods (5/16" X 18) & nuts for Z axis
GT2 belts & pulleys
Cable chain to reduce probability of fatigue failure in wires
E3D V5 Hot End, 0.4mm nozzle, also 0.8 and 0.25 in use occasionally
PB fan mount + 40mm fan -- using printed mount adapter, not the E3D supplied fan
Injection molded extruder gears
Optical Z "endstop" (custom designed and built)
Have used many pounds of T-Glase filament. Now also doing some work with Ninjaflex SemiFlex
Print on glass with Scotch Craft Stick or other glue stick
"My next printer is..." Prusa i3 MK3
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Re: Heated Bed is not heating

Postby venkei » 2015-Dec-Wed-02-Dec

Thank-you Jay,
I want to know one thing, the heated bed will not work without thermistor?.
Iam attaching the photos of my heated bed connections.
1. Heated bed wires red and black given to green terminal.
2. Thermistor wires plugged to white terminal in the bottom.
3. ATX power supply wires given to top right side terminal.
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Re: Heated Bed is not heating

Postby RetireeJay » 2015-Dec-Wed-08-Dec

venkei wrote:I want to know one thing, the heated bed will not work without thermistor?.
Iam attaching the photos of my heated bed connections.
1. Heated bed wires red and black given to green terminal.
2. Thermistor wires plugged to white terminal in the bottom.
3. ATX power supply wires given to top right side terminal.


Correct - the heated bed will not work in a Printrbot system without a thermistor connected.

But what is that device in your picture? It doesn't look like any thermistor I ever saw. It might be a thermistor, but normally the thermistors shipped by Printrbot are little glass or ceramic beads, not metal cylinders. And thermistors don't have a "polarity" (an orientation for + and - ) as your device appears to have. What you have looks more like either a fuse or maybe a thermal switch, which would turn on and off when the temperature crosses a certain threshold - probably marked on the device. If it's a thermal switch then it's totally incompatible with the control circuit on the Printrboard. (There would be a way to use the bed with this switch, but as far as the Printrboard is concerned, you would have to operate as if the bed was not heated. You would have no software control or readout of bed temperature.)

I'm guessing that you did not buy this heated bed from Printrbot. Would you mind telling us where you did get it? Maybe with enough information, we can track down the specifications for that strange device.

1. Yes, this is the right connector for the heated bed heater. In this case, polarity does not matter (red and black are interchangeable).
2. Yes, you have circled the correct connector for the thermistor, labeled "T-BED." Again, polarity does not matter (white and black are interchangeable).
3. Correct
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Printrbot Plus operational January 2013
Brass threaded rods (5/16" X 18) & nuts for Z axis
GT2 belts & pulleys
Cable chain to reduce probability of fatigue failure in wires
E3D V5 Hot End, 0.4mm nozzle, also 0.8 and 0.25 in use occasionally
PB fan mount + 40mm fan -- using printed mount adapter, not the E3D supplied fan
Injection molded extruder gears
Optical Z "endstop" (custom designed and built)
Have used many pounds of T-Glase filament. Now also doing some work with Ninjaflex SemiFlex
Print on glass with Scotch Craft Stick or other glue stick
"My next printer is..." Prusa i3 MK3
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Re: Heated Bed is not heating

Postby venkei » 2015-Dec-Thu-05-Dec

Thanks a lot Mr. Jay for your valuable suggestions.
I got heated bed from printrbot, but i did not get any thermistor from them. So i bought it from local market. Any how i ordered 100k thermistor from Amazon.
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Re: Heated Bed is not heating

Postby RetireeJay » 2015-Dec-Thu-07-Dec

venkei wrote:Any how i ordered 100k thermistor from Amazon.


Not all 100k thermistors are alike. Different models have different curves. But don't worry; even if your thermistor doesn't match the curve built into the firmware, you can still use it. The thing is you may have to experiment to find out what setpoint temperature gives you the results you want. If you post the specific model number of the thermistor you bought, I may be able to help you answer the question.
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Printrbot Plus operational January 2013
Brass threaded rods (5/16" X 18) & nuts for Z axis
GT2 belts & pulleys
Cable chain to reduce probability of fatigue failure in wires
E3D V5 Hot End, 0.4mm nozzle, also 0.8 and 0.25 in use occasionally
PB fan mount + 40mm fan -- using printed mount adapter, not the E3D supplied fan
Injection molded extruder gears
Optical Z "endstop" (custom designed and built)
Have used many pounds of T-Glase filament. Now also doing some work with Ninjaflex SemiFlex
Print on glass with Scotch Craft Stick or other glue stick
"My next printer is..." Prusa i3 MK3
User avatar
RetireeJay
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Re: Heated Bed is not heating

Postby venkei » 2015-Dec-Sun-03-Dec

Mr.Jay,
Thanks a lot for your support. I got the thermistor and now my heated bed working perfectly.
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