Bed temperature is hopping

Treito

Bed temperature is hopping
October 08, 2017 05:03AM

Registered: 9 years ago
Posts: 1,699

Hello,

if I try to heat my bed the temperature is irregular. Also if the temperature is reached it is changing by some degrees. Where I have to look for the fault? I use a silicone heater with builtin thermistor. Duet 0.6 from Replikeo.

2017-10-0810_59_17-Delta.png

Best regards,

Sven

Slicer: Simplify3D 4.0; sometimes CraftWare 1.14 or Cura 2.7
Delta with Duet-WiFi, FW: 1.20.1RC2; mini-sensor board by dc42 for auto-leveling
Ormerod common modifications: Mini-sensor board by dc42, aluminum X-arm, 0.4 mm nozzle E3D like, 2nd fan, Z stepper nut M5 x 15, Herringbone gears, Z-axis bearing at top, spring loaded extruder with pneumatic fitting, Y belt axis tensioner
Ormerod 2: FW: 1.19-dc42 on Duet-WiFi. own build, modifications: GT2-belts, silicone heat-bed, different motors and so on. Printed parts: bed support, (PSU holder) and Y-feet.
Ormerod 1: FW: 1.15c-dc42 on 1k Duet-Board. Modifications: Aluminium bed-support, (nearly) all parts reprinted in PLA/ ABS, and so on.

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dc42

Re: Bed temperature is hopping
October 08, 2017 06:43AM

Registered: 10 years ago
Posts: 14,672

Like causes are a bad connection in the thermistor wiring, or a short between the ground side of the thermistor and another ground.

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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Treito

Re: Bed temperature is hopping
November 04, 2017 06:20AM

Registered: 9 years ago
Posts: 1,699

I exchanged the bed heater completely but the problem still persists. So it seems that there is a problem with the Duet? Is it possible that the two pins from the sockets of the heater and the Thermistor may be connected? Next time when I remove the bed I will test it.

Slicer: Simplify3D 4.0; sometimes CraftWare 1.14 or Cura 2.7
Delta with Duet-WiFi, FW: 1.20.1RC2; mini-sensor board by dc42 for auto-leveling
Ormerod common modifications: Mini-sensor board by dc42, aluminum X-arm, 0.4 mm nozzle E3D like, 2nd fan, Z stepper nut M5 x 15, Herringbone gears, Z-axis bearing at top, spring loaded extruder with pneumatic fitting, Y belt axis tensioner
Ormerod 2: FW: 1.19-dc42 on Duet-WiFi. own build, modifications: GT2-belts, silicone heat-bed, different motors and so on. Printed parts: bed support, (PSU holder) and Y-feet.
Ormerod 1: FW: 1.15c-dc42 on 1k Duet-Board. Modifications: Aluminium bed-support, (nearly) all parts reprinted in PLA/ ABS, and so on.

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