Regarding disconnecting SMPS from mains, and then connecting the ncore's causing them to "explode".
The SMPS600 manual clearly states:
"Instructions for installation"
"Warning: Disconnect the unit from mains and allow all capacitors to discharge for 10 minutes before handling it"
Which for me clearly means the caps need to discharge slowly, whenever you handle/connect/disconnect equipment.
Although this warning is more meant for not killing yourself.
The SMPS600 manual clearly states:
"Instructions for installation"
"Warning: Disconnect the unit from mains and allow all capacitors to discharge for 10 minutes before handling it"
Which for me clearly means the caps need to discharge slowly, whenever you handle/connect/disconnect equipment.
Although this warning is more meant for not killing yourself.
That is great news that the next wave of nCore might get patched with this fix. But still, would it be wise to tell what this exact wrong order is, just in case?
Julf and Ouroboros,
Thanks for your explanations. I take your advise´s as for SQ it is better to use more "small" dedicated SMPS´s rather than one large "bulky" one. For the same money two SPS400 would provide better results than one SPS1200.
NicMac, Thanks for your reply. You are correct I am polluting the thread with general power supply questions when this thread is dedicated ncore.
Thanks for your explanations. I take your advise´s as for SQ it is better to use more "small" dedicated SMPS´s rather than one large "bulky" one. For the same money two SPS400 would provide better results than one SPS1200.
NicMac, Thanks for your reply. You are correct I am polluting the thread with general power supply questions when this thread is dedicated ncore.
This is just a common sense rule about voltage and power: before any intervention on electrical equipment, especially if you are assembling or disassembling, one must make sure the power source is disconnected. In case of an unconnected power supply there are capacitors that keep a fair amount of power in it so it needs to be discharged before engaging in any of the above activities. If Bruno manages to make the NCore more resistant to mishandling, it does not mean that you should start mishandling equipment. So there is nothing specific to the NCore here.
For UcDs I built 6 analog power supplies and discharged them after testing with wires going to a light bulb (The 110v bulb gave light). Is there a reason this should not be done with the SMPS? The direction pointing to wait for 10 minutes tells me that the PS is capable of discharging itself without intervention, it does not tell me that discharging it faster through a light-bulb is damaging (obviously a short circuit could be damaging).
Also I saw a note that you can use a resistor to discharge it: it should be noted that you need a power resistor, not a tiny little circuitry resistor. The resistor might become very hot (or melt, depending on what energy was stored). I assume a SMPS stores a lot less energy than an analog power supply, if so this is a lot less dangerous to handle than an analog power supply.
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Well, if i understood right, Bruno mentioned there is an exact wrong order of connecting the power cables between the SMPS and nCore. Even after the 10 minute period and even after the possible fix I would like to be able to avoid that exact wrong order of connecting the cables. If i don't know what it is, i cannot do that. I am not planning to connect anything to the SMPS for trying to discharge it.
i wrote 10r/10w.
you are write i should have made it more clear as i noticed there are people
with no experience and maybe they don`t don`t understand the meaning.
it`s 10ohms 10 watts.
this is safe for the small capacitors of smps.
i think.
he didn`t mean which cable to connect first but which cable goes where.
in case you confuse +with- for example when you power the amp to protect
it itself and stay off.
Why not? I imagine you'd discharge a standard rectifier supply before hooking it up to a power amplifier section - I certainly do - so why not do the same for an SMPS?
the big deal is that the manual says no touchy, 10 minute delay after power down, and them when you hook it up after a couple of hours the caps are still full and sparks fly everywhere/break your modules.
for some reason some people don't make sure the (sm)ps(u) is completely discharged before hooking it up.
for some reason some people don't make sure the (sm)ps(u) is completely discharged before hooking it up.
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