Temp in power supply controller

[Guille-SISE]

Hello!
I´ve got a WS-8-150-DC with problems.
In a test without POE devices conected, only one LAN port active to access web interface, show power consuption in POE ports that exceed the limits (ej: 42W).
In the status tab the device display a Power supply controller temp of 108°C but if i test with my hand (isn´t a termometer) in the board nothing is in this range of temperature.
I guess is a problem with sensors of the board, but i cant use the switch anyway because of this value of temperature, all the POE ports are disabled by thermal protection.
Any idea?
I searched in the forum similar problems, but only find issues related to RF noise that messed with the communications between the switch and the DC power supply. But i guess that isn´t my case because the board are different.
I will appreciate any comments.
Regards from Argentina.

[sirhc]

You will need to RMA it: viewtopic.php?f=6&t=1259

So the switch was working fine and then it went south?

The fact that the current sensors is reporting HIGH wattage would indicate a possible damaged current sensor.

Most common reason for current sensor damage is ground potential current from not bonding tower ground rods to service ground rods which means the EThernet cable is the path between 2 ground potentials which is explained in the posts below:

viewtopic.php?f=30&t=1816
viewtopic.php?f=30&t=188
viewtopic.php?f=30&t=1429
viewtopic.php?f=17&t=1786&start=30#p13447
https://community.ubnt.com/t5/airFiber/ ... rue#M31070

[sirhc]

Units manufactured after September 2016 we started bonding DC negative to Earth Ground to better help with ground potential differences when people do not bond all grounds together.

You can make the modifications yourself by following these instructions: viewtopic.php?f=17&t=2493&p=17453&hilit=MOD#p17448

[cwachs]

Similar issue two nights ago with a WS-8-150-DC at the top of a tower. At 4am local time, I got woken up to our SNMP alarms telling me the two APs on that switch were off. Logging into the switch showed they were powered down due to over temp of the power supply controller. It lasted in this over heated state for about 15 minutes and then cooled down and re-activated POE. The fan never reported being on in the GUI during any of this. This switch got back from RMA a few weeks ago (bad solder connection found) and has worked great until this incident.

Switch is connected to ground at the top of the tower - dedicated #6 for the switch and radios. It is tied to tower and electrical ground at the bottom. Switch was running 1.4.7rc18 at the time of the failure. It has been upgraded to 1.4.7 release today. The issue has not come back but I am always nervous when things happen I can't explain.

[Eric Stern]

The power supply controller temp was not being taken into account in the fan control algorithm. This will be addressed in the next release.

[sirhc]

v1.4.8rc2 has been released to address this issue.

[Julian]

Hello!
I´ve got a WS-8-150-DC with problems.
In a test without POE devices conected, only one LAN port active to access web interface, show power consuption in POE ports that exceed the limits (ej: 42W).
In the status tab the device display a Power supply controller temp of 108°C but if i test with my hand (isn´t a termometer) in the board nothing is in this range of temperature.
I guess is a problem with sensors of the board, but i cant use the switch anyway because of this value of temperature, all the POE ports are disabled by thermal protection.
Any idea?
I searched in the forum similar problems, but only find issues related to RF noise that messed with the communications between the switch and the DC power supply. But i guess that isn´t my case because the board are different.
I will appreciate any comments.
Regards from Argentina.

This unit looks to me to have been damaged by ground current; your current sensors reporting high values like they are makes me think that your tower and service grounds aren't sufficiently bonded, the current sensors are usually the first thing to go in a ground current scenario.

Here are some good posts on grounding:

viewtopic.php?f=30&t=1816 ,
viewtopic.php?f=30&t=188 ,
viewtopic.php?f=30&t=1429 ,
viewtopic.php?f=17&t=1786&start=30#p13447 ,
https://community.ubnt.com/t5/airFiber/ ... rue#M31070

(stolen shamelessly from sirhc)

Your unit will need an RMA, sadly, the instructions to do so can be found here; http://forum.netonix.com/viewtopic.php?f=6&t=1259

Sorry for the inconvenience, and thank you.