PWM logics of M307
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Hi Everyone,
I was getting error because my bed heated up slower than the expected 1.7°C/s
I tried autotuning but apparantly it failed somewhere during phase 4.I changed the PWM value to 2 and haven't had the error since but I'd like to know what it actually does.
M307 H0 B1 S2.00
Kind regards,
Kaj
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Given that the documentation for M307 says:
Snnn maximum PWM to be used used with this heater on a scale of 0 to 1. Default 1.0.
That S2.00 is likely doing nothing. The default was 1.0 and I'd bet that setting it beyond 1 just sets it to 1. Further, I'd bet that the non-error is because the bed was not totally, completely, cooled to room temp when you experimented further.
I would HIGHLY recommend running an autotune, and putting the resulting parameters in config.g.
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Oh, and your question: S being scaled 0 to 1, and called "Max PWM", it looks like it is the maximum duty cycle for PWM on the heater specified.
See "duty cycle" here
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@Danal sounds plausible to why the error didn't occur anymore. I'll retry tomorrow with a cold bed and report back.
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@Danal I just retried with a cold bed and heated up to 70 without getting the error.
I'm printing now so I'll try again tomorrow after setting it back to 1 -
@Kaj said in PWM logics of M307:
@Danal I just retried with a cold bed and heated up to 70 without getting the error.
I'm printing now so I'll try again tomorrow after setting it back to 1Sounds good. Did you ever run a calibration?
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@Danal I did yeah, it went to phase 4, was cooling down for a while and later when I checked it had an error in phase 4.
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Cool (he he). Keep us posted.