Best posts made by heinrich.platau

Thank you very much for evry answer. I think first of all I should check the PWM Frequency (Q-Parameter) and change it to 5 Hz as the data sheet says.

I've already ordered a 230V heating bed. So my amps will be much lower. Finally I will install a bimetal switch (130°C) as a thermal fuse to guarantee fire safety...

But I am very thankful for the tip about the PWM Frequency... So far no one could give me an explanation why the SSR got defective.

@fcwilt Thank you Frederick.

Now, after auto tuning, the heating bed works fine.

@jay_s_uk

You are right!! Problem solved!

I thought about the worst case but I'd better check the most obvious error.

Thanks.

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