I think the problem is that theres no ignition signal, and your using it in psu mode.
Originally Posted by settra
How i'm about to set up my m4 is a bit different, but after testing it in a few hours now, i should be able to answer your question.
How i understand it, if you put the jumper settings in psu mode, its just an atx module that does nothing other than provide dc when its there in spec (6-i don't remember the high rating off the top of my head). It will just run till the voltage is too low to power the device, then hard off.
What my application for the board is, is a graceful dc ups shutdown, normally powered by a 16v 150w meanwell smps, with a 12v18ah agm pwm floating at 14.2v. Using a y-pwr adapter from the same company to provide a ideal diode switch that connects the highest voltage, and autoswitches to the other in the event one drops below the other. For a low wattage htpc server.
So with my meanwell @ 16v when ac is on, and the vlra (12v18ah) floating at 14.2 pwm'd (agm with a morningstar sg-4 pwm charger, thats the right float voltage, its only getting very short pulses of dc when fully charged), its pulling power from the meanwell. When ac drops out, it switches over to the vrla. Could set the low cutoff fairly high if you just want to gracefully power down the load.
This is with mode p1, dip1 (down) the rest up. Basically just dip switch one down. IF i understand this correctly, wiring the ignition terminal to the + out on the meanwell (or your ignition terminal) would turn on the supply after 5 sec of ignition closing, and kept closed to keep on. Then power up and stay on. When you switch the igniton dc lead from the smps/alternator off, and the v+ from the ignition is opened, no voltage flowing, it waits 5 sec before doing a soft shutdown trigger, then 1 min later, when it sould be off, 5vdc out shutdown.
So how you want to do this, is set your deep discharge to whatever you want, in my case about 11.4v. But when the ignition terminal is closed (higher voltage ran directly from meanwell, or in your case the ignition switch, since if i ran it to the ypwr it would remain on as its getting a voltage on trigger. So ac drops, igniton is 0v, device enters shutdown procedure.
Then, assuming i want to power it on when ac is down, or browning out (happens alot at 5k elevation in the sierra nevadas (lots of brutal snow storms), with brutal wildfires in our hyrdo electric canyons in the summer being an issue with ac reliability as well), just wire an appropriately rated relay (12v, 10a) to open up the ignition signal from the battery powered off a 5v cheap ebay 12v-5v regulator and a low rated toggle switch to trigger the relay 5v control low amp closed. When ac goes back on, the y-pwr should switch back over to the higher voltage dc supply, in my case a meanwell, or for you a fla car battery @ ~13-14v being charged by the alternator. Could also do this with a regulator and solar panels, for an off the grid system without using a car alternator, or ac/dc supply. or a heavy duty switch just opening the ignition terminal to the battery positive. This should switch on the pc, so long as that toggle lets the + battery voltage get to the ignition terminal. Then toggle off when your done, and it will gracefully shut down. Just remember to get a beefy (i'd say 15a min spdt to be safe fused at that amperage, slas have can have dangerous short potential.
If i understand that correctly, you get over-discharge protection for your vrla/sla, either automotive;ac/dc or ups sourced power switching, and auto switching between the higher voltage when the car is alternator charging the battery, or being hit with 16v dc from an ac/dc adapter in my case. All automatic, and it saves your vlra capacity since it only using it for 3m max to shut down. But you need a y-pwr adapter from the same supplier you got your m4 from. They aren't expensive though. And can handle 30v 10a max. Series 2x12v lead acids if you need the extra wattage. A 120w 12v regulator is a good idea if not.
When i need to actually run this ~120w load (could be more less, need to run it through my kill a watt for ac/watt meter for dc (23" led (30w), foxcon R30-a1 with a 120gb ssd (i'd imagine under 70w), and a 4 bay 7.5 tb enclosure (2x 5400k, 2x 7200k SATAS) ~50 watt, the i just will switch over to my 1kwh vlra bank floating at 14.2 pwm. Since i mechanically isolate the charge/discharge circuits on that bigboy. All from dc of course, so you save a bit of waste in DC/AC/DC rectificaton.
TLDR, though theres some good info in there-
Put it in p1 mode and confiig the cutoff to whatever you want, stay above 11.3v for all lead acid cells, wire ignition terminal to the cars ignition switch, fuse to be safe, and if you want to config it to not power off right away, set your lvd to 11.3, and add a toggle switch/relay powered by a 5v regulator, to switch on a 8a fused 10a relay, or 10a fused 15a relay, whose trigger is switched on/off with a low amp toggle, that closes a power signal to switch the relays without using big *** toggles without relays, to get that ignition signal required to power the supply on.
Then the pc shuts down gracefully, instead of hard-off with ac mains outages, gives your under voltage protection on your lead acids, and allows dc power triggering to the ignition from your battery or smps supply from the lead acid, or a simple large toggle switch. I'd opt for a relay/regulator trigger, so you don't have to fiddle with switches. But you lose wh's in a sla backup bank, and you want to squeeze all you can get out of it when the power goes out for days at time where i live at least 3-6 times a year for on average 24hrs at a time.
And i take care of my 5tb+ media collection :o. Those 2tb's aren't cheap.
I really like all the features and power of the M4 ATX but i have been reading that it can generate all kinds of noise to the sound and video of your setup. Also interrupting fm signal completely and gps signal to some degree at least. Are there new units out that dont do this anymore? or have you found a way around this. Are these valid issue? I really want to start getting this install together but the PS is the only thing holding me up.
the m4-atx is an open PSU, ie it has no shielding. You can get a metal case for it, this will help shield any interference it puts out.
.so... any idea about the deep discharge prevenation? i am still trying to figure it out!!