Re: Slow heating up on MK3 dual power heat bed:S

Thanks guys for all the good information ! Really appreciate your knowledge sharing !

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Cefiar
1. What voltage do you get on the following places with the heatbed off (referenced to Gnd on the PSU input to the RAMPS 11A connector):
a. 11A PSU input to RAMPS?
b. D8 + pin (nearest the 11A connector)?

1 a. 12.37v
1 b. 12.37v

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Cefiar
2. What voltages do you get on the following places with the heatbed on (referenced to Gnd on the PSU input to the RAMPS 11A connector):
a. 11A PSU input to RAMPS?
b. D8 + pin (nearest the 11A connector)?
c. D8 - pin (the other D8 pin)?

2 a. 12.35v
2 b. 12.25v
2 c. 0.18v

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Cefiar
3. What voltages do you get across the connector of the heatbed with the heatbed on, at the heatbed end?

3. 11.88v

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Cefiar
From comparison of 1 and 2, you can see if your PSU is drooping under load (eg: putting out less than 12V).

From the values given by 2 and 3, you should be able to map the rough voltage drops in the circuit, which may help identifying further issues if the PSU is not drooping under load.

BTW I am using the ALU MK3 without glass. Cork is already attached.
I am using ordinary ceiling lamp wires (german ones with 3 braided wire). They are 0.75mm² which is like something inbetween AWG 20-21. Maybe they are too thin ? I've just read that the description says "Not for connecting cooking and heating devices" :).