Automatic power supply management

Krohm Koala

Hi ! Just got my duet WiFi and I am using a relay to cut my power supply, but I've seen there is no automatic management, so here is my question, will there be an automatic power management like when you request a move or heating that toggle the relay and when nothing is moving and the heater goes cold, it cut the power ?

Have a nice day

dc42

Using either an ATX PSU or suitable hardware (e.g. SSR) to control mains power to your PSU, you can use the M81 S1 command at the end of your print job to turn off the power when all thermostatic fans have stopped.

The firmware reduces the motor current to the idle value when nothing has moved for 30 seconds. You can set the idle current percentage in the M906 command.

Krohm Koala

I've seen all of these thanks but my printer make a bit of noise when idle (motors and PS) and (i know it's a marlin habit) the things that is missing (for me) is the autopowering when a mouvement or heating is ask to the printer
If it can't be done i'll just throw away my relay and do with it, just some automatic habit that i'm missing a bit

dc42

Are you aware that stepper motors don't hold position when powered down? At the very least, they will move up to 2 full steps; and on some printer types they may move much more than that. We could implement auto power off/on, but after powering on you would need to re-home the printer before you can use it safely.

If you don't care about the loss of position, you could set the idle current percentage to zero in the M906 command.

Krohm Koala

I am aware ^^ i was using this functionnality every day when i got my ramps and marlin (1.1.9 or 2.0).
BTW every print you launch, you rehome the printer, so i think it doesn't matter if the powersupply shutdown and motors move a bit.
And i wanna point a thing, i've seen that when i shut down my PS, my axis stay homed, the fact that there no power don't make them "unhomed" (Sorry for my english i'm french guy ) so the loss should be here, maybe make the M81 unhomed the axis too (i expect i said it right ). For the moment i'll set the idle to 0

Krohm Koala

@dc42 Hi ! just wanted to know if it was a bit of news about that ?

dc42

As you are the only person who has asked for this, i think it would be best implemented using the daemon.g file that is supported in RRF 3.01-RC5 and later. Let me know if you need any additional object model variables in order to implement it.

Krohm Koala

@Krohm-Koala oh I see i'll search about daemon.g thanks

Krohm Koala

@dc42 is there an object model variable for the state of the power supply ? Also as i'm totally noob in this type of programmation, can't do anything, as everything i try turns to nothing ^^ i'll just continue as it is and deal with it i think ^^ thanks anyway

dc42

@Krohm-Koala said in Automatic power supply management:

@dc42 is there an object model variable for the state of the power supply ? Also as i'm totally noob in this type of programmation, can't do anything, as everything i try turns to nothing ^^ i'll just continue as it is and deal with it i think ^^ thanks anyway

There is a special status "off" which means that VIN power is not present. That's what you should get when you turn off VIN power. Alternatively, you can retrieve the VIN voltage directly.

~~There is not currently an object model value to say what the state of PS_ON is according to the last M80 or M81 command. Do you need one?~~

dc42

Correction to above: there is a variable that says whether PSON on or off, only available if there has been a M80 or M81 command since reset. It's called state.atxPower.

Krohm Koala

oh cool ! maybe i'll try something do you think there's a way to automatically turn on psu when an heater need power ? I think there's the only thing i want the most to do, for the other things i needed it at the beginning i overcome with M80 almost everywhere

Krohm Koala

Also, how do you get the status of VIN or VIN voltage to do meta code ? Maybe easier than state.atxPower to be sure there's no false positive or can be using directly at the reset ? Or maybe i can add M81 at the end of my config.g to be sure it's ok since the reset

dc42

@Krohm-Koala said in Automatic power supply management:

oh cool ! maybe i'll try something do you think there's a way to automatically turn on psu when an heater need power ? I think there's the only thing i want the most to do, for the other things i needed it at the beginning i overcome with M80 almost everywhere

I'm not sure it will work because of the lag, but in your loop in daemon.g, if power is off you could iterate over the heaters and turn on the power if any target temperature is above 45C.

@Krohm-Koala said in Automatic power supply management:

Also, how do you get the status of VIN or VIN voltage to do meta code ? Maybe easier than state.atxPower to be sure there's no false positive or can be using directly at the reset ? Or maybe i can add M81 at the end of my config.g to be sure it's ok since the reset

07/04/2020, 16:47:43 	echo boards[0].vIn.current
24.5

Yes you can use M80 or M81 in config.g.

Krohm Koala

@dc42 said in Automatic power supply management:

I'm not sure it will work because of the lag, but in your loop in daemon.g, if power is off you could iterate over the heaters and turn on the power if any target temperature is above 45C.

I think i'll try something like that ^^ just need to find how to check if the target temp is above some °C and it should be ok it'll be funny to try something like that as i'm a complete noob in coding, i had done an auto change filament script, i think i can do that too

Krohm Koala

Cant validate my code for now as i'm printing but, here is the code if you want to look at it i hope it'll work

if boards[0].vIn.current < 23
....if tools[0].active > 100
........M80
........break
....else
........break
....else
........break

Krohm Koala

So, i made some tests, this is the final version, better and also, look for the head temp or the bed

while boards[0].vIn.current < 23
....if tools[0].active[0] >= 100 || heat.heaters[0].active >= 40
........M80
........break
....else
........break