ByUser9991
I understand the difference, but why should the voltage be grounded with PELV? In my case, that would be 12 volts DC, a safe voltage. The voltage is generated by a power supply that is also clamped to the DIN rail. Is there a reason to use PELV instead of SELV?
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Please provide reasons. Thank you!
the 12 V are not grounded. At the output of the power supply there is current limit / fuse.
Error creates connection between plus 12 V and frame.
Now the question of all questions. Solves backup when power supply is not grounded?
This is a current limitation (3A) so I stay with SELV. The housing and the other is made of plastic only the metal hat rail
if the power supply is not grounded, the 3 A current limiter would not run further despite grounding.
This means that all connected consumers with minus 12 V will be
jo thank you after detailed consideration makes the actual sense, my case of the router was anyway connected to the PE to derive overvoltages etc. If the Plus Pol had somehow become loose and came to the housing nothing would happen but on the housing would be 12 volts. Then the difference between housing and internal electronics is also 12 volts to minus. And there would be nothing, then this is polarized at the moment and it can come to the current flow, with my PELV now this can no longer happen as before the current is returned to minus and the current limiter starts
I don’t get it yet have Pelv built
that doesn’t make any sense when the current limit is used, the voltage is regulated so that no potential difference arises
if now a device is connected to -12 instead of 0V and this has connection via LAN to the router, because 3 A speaks something
I have neither SPS nor sensor only one router was connected.
would use the current limit, but does not do it because -0V isolated from the earth is thus unable to happen.
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That’s exactly what I’m trying to make you realize that something can happen anyway.
If one of the components, such as SPS ect, is internal to ground, i.e. Minus input and the sensors come from -12 V it is destroyed or misconduct occurs
So I think there’s some communication difficulties here. The power supply is connected with phase/N and PE. From the net, 12V goes out at 3 amper. On top of it my devices run, there is no control element such as buttons etc. it comes to short-circuiting with the hat rail, loose cables etc etc etc etc would use the current limitation, but does not do it because -0V is isolated from the earth thus this cannot happen.