Can RRF@Duet3 use DC_OK signal from PSU?
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I have a power supply that provides DC_OK signal and I would like to use it instead of low voltage detection to pause the print.
My PSU works in a way, where it has some hold time when there is no input power, but when caps are out of juice it just immediately shuts off output. But when there is no input voltage it provides a signal that can be used.
Setup: Duet3 standalone
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You could possibly use it as an input pin to trigger a pause. What is the nature of the DC_ok signal?
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@Phaedrux This signal is OC, pulled down when PSU is operational. In case of lost AC power it goes high and a while after (exact time depends on PSU load) undervoltage protection cuts off output.
PSU output voltage does not drop linearly and monitoring V_IN is basically useless for power resume.
I could trigger use trigger from one of digital inputs to pause the print, but would this be enough to resume after restoring power ?
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Yes when the print is paused the same information gets gathered as with a power drop event and can be resumed in the same way.
https://duet3d.dozuki.com/Wiki/Setting_up_to_resume_a_print_after_a_power_failure
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@BoA said in Can RRF@Duet3 use DC_OK signal from PSU?:
I have a power supply that provides DC_OK signal and I would like to use it instead of low voltage detection to pause the print.
This is not yet supported, but is on the list for implementation soon.
