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Forum Discussion
PoE doesn't start_GS308EP
We use the GS308EP to manage 2 differents VLAN in our custom system.
the port 1 is used to power on a RFID reader (FEIG MR102), the others ports are for classic ethernet commnication.
We configure it as we wanted and it works as expected, but we have an issue on the activation of the PoE function at the start of our system.
The switch power supply come from an electric inverter (which supplies the main power line when its function of inverter is not needed).
Upstream the inverter we put a circuit breaker (2CSR275180R1164 DS201 M C16 A30).
Our issue follow this patern:
If we turn our system ON, by starting it from the inverter (with the circuit breaker open), the PoE launches without a problem, in all cases.
If we turn our system ON, with the circuit breaker close and we start the inverter, the PoE doesn't launch, and if we open the circuit breaker, the supply from the inverter takes over and the PoE launches immediatly
When we say "PoE doesn't launch", we mean the green led on the port (and the orange) doesn't turn ON. And we say that "the PoE starts" because the green led turn ON.
We suspected the circuit breaker, and change the type (from AC to A), but the issue continue.
We have isolated the switch to keep only the port 1 (to know if the issue could came from some interference from something else), but the issue still occur.
What is bother us the most is that, after changing the circuit breaker, the issue seemed to have been resolved (we made severals power ON test), and the PoE did activate in some previous problematics cases, but at one time, on another test of power ON, the PoE didn't launch (only by open the circuit breaker like before), and we went further by powering it ON on a normal power outlet , and even like this, the PoE didn't launch...
The software is up to date (V2.0. something), the configuration seems ok, we activated the long time detection, etc
It is not an isolated case, on one of our other product we reproduce the issue (same hardware configuration).
Thanks for the help we could get.
14 Replies
If we turn our system ON, by starting it from the inverter (with the circuit breaker open), the PoE launches without a problem, in all cases.
If we turn our system ON, with the circuit breaker close and we start the inverter, the PoE doesn't launch, and if we open the circuit breaker, the supply from the inverter takes over and the PoE launches immediatelyThat circuit breaker is making a direct connection from the AC mains to the Inverter output?
How is the inverter output kept synched to the 50 or 60 Hz mains?
When I'm thinking what (certainly will) happen on our Swiss Army Museum Site when we fire up the big Sulzer Diesels and connect the three phases to the AC mains power network -without- the diesel generators being almost in sync with the mains. Shudder - the power network will likely win, the installation would loose, and break badly.
This is what I understand from your initial description.
PS. To avoid confusion to the future readers,
I'll move the post to the
Easy Smart, Plus and Smart Switches | NETGEAR Communities section, and have removed the Managed Switch tag from your original port, because of the GS308EP is not a Managed Switch in Netgear terms - it's a Smart Managed "Plus" Switch model.
Hello,
Your GS308EP is experiencing a PoE initialization failure triggered by the specific power ramp-up of your inverter when the circuit breaker is closed. Because this switch is a "Plus" model with managed power logic, its PoE controller is highly sensitive to the voltage stability and inrush current it sees the moment it receives power. When you start the system with the breaker closed, the inverter may be producing a brief "dirty" signal or a slight voltage dip as it synchronizes with the grid, which causes the switch's PoE subsystem to fail its self-test and enter a protection mode (resulting in no LEDs and no power to your FEIG MR102 reader). In contrast, starting from the inverter alone provides a "cleaner" DC-to-AC transition that the switch handles better.
Hi,
thank you for the interest you give to our issue.
If it can help more, here is the ref of the inverter: APC; BX2200MI-FR
We already investigate the possibility of an issue from the inverter, but we validate the fact that even directly connected to the circuit breaker, without the inverter in the circuit, the issue occurs.
We thought about the behavior of the circuit breaker, that was why we change the type of the circuit breaker from AC to A (apparently more suitable for our system, the switch in particular with its PoE function). The initial tests were conclusive, but throughout the tests, the initial issue came back. To such an extent that even power from a wall outlet, PoE didn't even start anymore.... The switch was in a state that even by restarting it, the issue occurs everytime.
And a collegue of mine came like 1 hour after me, and then said to me "Is ok the system works fine the PoE launch as expected".
That circuit breaker is making a direct connection from the AC mains to the Inverter output?
To be precise, between the AC mains and the inverter, there is an auxiliar outlet intern of our system (ABB 2CSM110000R0711). The inverter is plugged in the outlet which is downstream the circuit breaker.
How is the inverter output kept synched to the 50 or 60 Hz mains?
We don't know how is it managed, but from the datasheet of the inverter it seemed it is manage, one way or another.
If it can help more, here is the ref of the inverter: APC; BX2200MI-FR
Just an industry standard APC Back-UPS, off-line, 2200VA, Protection from power outage, 230V, 4x CEE 7/5 French Schuko outlets, Automatic voltage regulation
Off-line means the
Still read and understand there seems to be a circuit breaker interconnecting the AC mains input with the output side of the APC UPS?
The ABB component is just a DIN rail mounted connector. The power is coming from where in your design - AC mains or from one of the four APC UPS outlets?
Still don't fully get the electrical design intent.
Would you mind to provide some schematics of the key components in your system please?
Are you trying to deal (or work around) the disadvantages of this offline ups with sone added a circuit breaker and sone cabling bringin the AC mains direct to the UPS outlet, where the off-line characteristics not natively offer zero transfer time as the transfer of such devices varies between 3 to 8 milliseconds? However, the popularly known value is 5 milliseconds. Due to this reason, these are used with small or non-critical loads that may handle this small amount of disruption.
Thank you for your interest,
We can not share the complete and details documentation, but we made a schematic which we hope that will help to understand the architecture of our design
I understand the interrogation about the specification around the inverter, and it was one of the first element we tested during our investigation. The thing is with the switch plugged directly on the input power source, without the inverter in the loop, the issue stoll occur.
If we turn our system ON, by starting it from the inverter (with the circuit breaker open), the PoE launches without a problem, in all cases.
If we turn our system ON, with the circuit breaker close and we start the inverter, the PoE doesn't launch, and if we open the circuit breaker, the supply from the inverter takes over and the PoE launches immediatlyWhat happens if you power the GS308 directly from the breaker (bypassing the inverter)?
We test that too and directly from the breaker the PoE doesn't launch.
Fun fact, when we open the breaker, we could see briefly the green light of the port 1 lit, but of course lit off because the circuit is now open.
We test that too and directly from the breaker the PoE doesn't launch.
So the problem is with the quality of the mains power, not the UPS. The UPS is just passing along the mains power when the breaker is closed.
Have you tried testing the switch using a different outlet?
You could do a risk-buy of a new power adapter for the switch. Or maybe try a power conditioner on the mains.
Hello everyone,
You can find at the following link (https://fromsmash.com/PrincipeSchematic) the simplified schematic of our system center on the powering of the reader in PoE.
Hope it could trigger an idea to pin out from someone.
at date, the link expire 22th january.
Thank you
The only ideas I have are to
- replace the switch
- buy a different power adapter for the switch
- buy a power conditioner
- try powering the RFID reader with a PoE power injector at the switch (disabling PoE on the switch port), connecting the power injector directly to the UPS.
Since this happens when the switch is directly connected to mains power, I don't think the other components on the circuit are causing the problem.
None of these ideas are guaranteed to fix anything, since we really don't know the cause.
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