24v powered board thermal swing

makerbase-mks / MKS-Robin-Nano-V1.X

MKS Robin Nano is a powerful 32-bit 3D printer control board with STM32F103VET6. Support Marlin2.0. Support MKS Robin TFT24/28/32/35/43 touch Screens. The motherboard integrates 5 AXIS interface, hot bed, 2 heating heads, 3 NTC100K, 1 MAX31855.The motherboard integrates After shutdown. Support MKS Robin WIFI for cloud printing and supports firmware update by SD card…

https://www.aliexpress.com/item/33013776323.html?spm=2114.12010612.8148356.5.320565f4m9CS1x

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24v powered board thermal swing #102

Open meteozond opened 3 years ago

meteozond commented 3 years ago

There is some information about noisy 5v line if the board is powered via 24v adapter.

I've ran into this problem too on my v1.2.

Temperature sensor is fluctuating up to 4-5 Celsius even with powered off heaters.

Powering over 5v usb or 12v power adapter eliminates this.

So what is the best way to fix it without replacing capacitors or power adapter to 12v?

mks-viva commented 3 years ago

Hi! You only connected temperature sensor on the board?

meteozond commented 3 years ago

Hi! You only connected temperature sensor on the board?

Yes, after facing this problem I've removed all connected devices. Problem hasn't gone :( Connecting through usb only gives better picture:

I've tested two new power adapters 24v and 12v - both shows same picture:

24v

12v

meteozond commented 3 years ago

Just received and tested several replacement cards:

MKS Robin nano v1.2 - temperature jumps
MKS Robin nano v3.0 - temperature jumps (wtf!!!)
MKS SGEN L V2.0 - stable temperature reports

Looks like all Robin series boards give unstable temperature reporting what leads inconsistent prints 😡