Eaton PowerWare 9120 3000i - High O/P V

[leniwiec]

Hello
UPS as in the title. I get High O/P V error on lcd scrren and constant beep. I cant find any info in internet even service manual.
Does anyone can give me any tips on how to start the repair on this ?

[m k]

First you need to bypass few safety features, like removing some covers and possibly using the device without proper chassis.
And definitely without proper protection against hazardous nuances, like mains, isolated and not.

[edpalmer42]

First things first.

What is the output voltage set to and what do you read with a DMM?

[leniwiec]

What is the output voltage set to and what do you read with a DMM?

It is hard to measure, because its instantly switch to bypass mode and turn off inverter. I just find out, that in the same time, when this error occurred, break connection on usb port

Code: [Select]

[1184457.106175] usb 3-2: reset low-speed USB device number 5 using uhci_hcd
[1184457.382106] usb 3-2: device descriptor read/64, error -71
[1184457.766109] usb 3-2: device descriptor read/64, error -71
[1184458.146055] usb 3-2: reset low-speed USB device number 5 using uhci_hcd
[1184458.422129] usb 3-2: device descriptor read/64, error -71
[1184458.810121] usb 3-2: device descriptor read/64, error -71
[1184459.186114] usb 3-2: reset low-speed USB device number 5 using uhci_hcd
[1184459.602123] usb 3-2: device not accepting address 5, error -71
[1184459.870169] usb 3-2: reset low-speed USB device number 5 using uhci_hcd
[1184460.290165] usb 3-2: device not accepting address 5, error -71
[1184460.290792] usb 3-2: USB disconnect, device number 5
[1184460.418112] usb 3-2: new low-speed USB device number 6 using uhci_hcd
[1184460.558120] usb 3-2: device descriptor read/64, error -71
[1184460.806125] usb 3-2: device descriptor read/64, error -71
[1184461.046139] usb 3-2: new low-speed USB device number 7 using uhci_hcd
[1184461.182125] usb 3-2: device descriptor read/64, error -71
[1184461.430128] usb 3-2: device descriptor read/64, error -71
[1184461.542225] usb usb3-port2: attempt power cycle
[1184461.542263] usb usb3-port2: failed to disable port power
[1184461.670134] usb 3-2: new low-speed USB device number 8 using uhci_hcd
[1184462.086168] usb 3-2: device not accepting address 8, error -71
[1184462.214130] usb 3-2: new low-speed USB device number 9 using uhci_hcd
[1184462.630145] usb 3-2: device not accepting address 9, error -71
[1184462.630628] usb usb3-port2: unable to enumerate USB device