Ps-on / PS-off Duet3 6HC
If I have a 24V 500W power supply with 4-10V Powerswitch circuit how do I have to connect it to the Duet3 6 HC? Do I need a 5V external connection? Got a 5.2V power supply for my SBC. From that I could go with 5V to the board and from the 24V power supply with - to the power supply and with the + on PS-On on the Duet board. Or do I have to use the + 5V from the power supply to PS-on on the power supply and with - on the board?
achrn last edited by
I don't understand the detail of your power supply (i.e. what you mean by '4-10V Powerswitch circuit') , but what I have is separate 5V and 24V supplies. The 5V is effectively always on and supplies the SBC (I have a Pi4) and also connects to the +5V and GND pins of the'EXT 5V' conenctor on the MB6HC. I have no jumpers on any of the 'power options' jumpers near the middle of the board.
I then take the pson signal to drive a relay board that swicthes the mains voltage to the power supply that's generating the 24V. The gnd and 24V from that supply are connected to the MB6HC 'POWER IN' screw terminals.
Whether this will work directly on your power supply is the bit that is uncertain - the pson signal is designed to work ATX PSUs - when the MB6HC wants to switch the power supply on, it connects the pson pin to ground - so if your supply complies with that it should work. However, if your power supply switches on when a positive voltage is applied to its control line, then you'll need something else external to do that.
Little preview of what is to come in 3.4b4 - the gCode wiki has already been updated, so the cat is already out of the bag. No more relay needed for Meanwell power supplies (with built-in pson functionality)! We've been working with the Duet team testing this and it's working beautifully. I'll be assisting with a write-up after 3.4b4 has been released.
M80: ATX Power On
C"port_name" (RRF 3.4beta4 and later) Name of the pin used to control the power supply, default "pson"
M80 C"!pson" ; invert the PS_ON output for Meanwell power supplies
Turns on the ATX power supply from standby mode to fully operational mode using the power supply control pin on the External 5V header. If a deferred power down command was set up using M81 S1 then it is cancelled.
Thank you for your response. I'm looking forward to testing the whole thing. Is there then also a description of the cabling for the standard connection PS-on? Do you also need the external 5V connection?
@heartleander81 Is this a Meanwell power supply? If so, it should not require an external 5v power supply, but you'd need to verify. I'll be assisting with a write-up soon, but real quick - Meanwell's specs are not clear. We worked with one of their engineers to validate and work out the details - at least for the model power supplies we utilize.
The pson terminal on the Meanwell power supplies (that we utilize - probably all, but we can't guarantee this) are actually carrying positive voltage. Check to see if yours is as well. If so, try grounding it to the negative terminal and the power supply should go into standby mode. Meaning it can be operated by a simple switch - or through the Duet by inverting the ps-on signal which is what is upcoming in 3.4b4.
@oozebot I get the RSP 500W 24V the days like in the picture.
Thanks very much. That helps me further. So thank you to the whole Duet team for your work and help.
It appears the plug you’ll need is the DF11-4DS-2C and the matching connectors are DF11-2428SC.