WS-12-250-AC watts incorrect

[neteng]

Running 1.5.14 . Watts shown on the ports where power is turned on are incorrect. I have one where shows 0 to 1 but the AP is working and should be using around 16. I have another port showing 147 and is the same hardware as the one above. A third is showing around 80 and same hardware attached. Another is showing 38 but is a small Ubiquiti ptp unit and shouldn't be anywhere near that.
Reboot did not fix the issue.

Any thoughts?

Terri

[Dave]

your switch has most likely been damaged...

[thomas]

blown current sensors. ignore it if you don't need current sensing on those ports, or drop me a line for out of warranty repair (this is definitely not a warranty issue)

[IntL-Daniel]

blown current sensors. ignore it if you don't need current sensing on those ports, or drop me a line for out of warranty repair (this is definitely not a warranty issue)

I have the same issue on the same switches WS-12-250-AC on 2 of 2 of the last received batch 1 year ago (propably last produced) and I bet with different (low quality) sensors. I had never this issue on any previously deployed 20 pcs of switches. Any chance you can help me @thomas? Where are sensors located on the mainboard? Thank you.

[thomas]

definitely wrong about using lower quality sensors, they use expensive TI current sensors, can't really ask for a better brand than that. if you have this problem right out of the box, see if oyu are getting about 1.5-1.8v coming out of the ports when they are turned off. if you are getting 0v on that port but it does provide POE, then the current sensor is dead or manufacturing defected.

if you do get 1.7v but a bunch of ports are reading high wattage, you might probably have a 4051 that wasn't placed properly (check U26/27)

the current sensors are the small 5 pin guys that marked BJJ.
I don't check these forums often so drop me a line at repairs @ isptechnology dot ca if you want a quicker response