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Newbie with a problem - can't get bed to heat up at all

Posted by MrCrispi

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MrCrispi

Re: Newbie with a problem - can't get bed to heat up at all
January 16, 2014 09:33AM

Registered: 10 years ago
Posts: 105

RS stock number is 746-8208 website is rswww.com - thanks

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reprappro

Re: Newbie with a problem - can't get bed to heat up at all
January 16, 2014 10:05AM

Registered: 12 years ago
Posts: 116

The data sheet says this has a beta value of 3350–3399K, much lower than ours. Your bed will report a temperature higher than actual, by about 5-10C, I think.

Ian
RepRapPro tech support

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dc42

Re: Newbie with a problem - can't get bed to heat up at all
January 16, 2014 10:06AM

Registered: 10 years ago
Posts: 14,672

The beta of that thermistor is significantly lower than the calculation assumes. I've attached a spreadsheet to calculate the error this will introduce.

Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].

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Attachments:
open | download - Thermistor.ods (14 KB)

MrCrispi

Re: Newbie with a problem - can't get bed to heat up at all
January 16, 2014 10:45AM

Registered: 10 years ago
Posts: 105

Excellent - thanks; much appreciated

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TMD_RS436

Re: Newbie with a problem - can't get bed to heat up at all
January 16, 2014 03:30PM

Registered: 10 years ago
Posts: 119

Or you can buy this one from RS: 706-2780 its the same item as the one from Farnell.

Paul

RS Ormerod No 436