NUT and APC BN900M

JSmorada

I just purchased an APC BN900M and connected it to my PfSense machine. I installed the NUT package and see no driver entry for APC UPS's. How to I get the NUT package to recognize the UPS? I tried all the listed drivers and they all came back with messages such as "failed to receive status".

Thanks,
Jon

dennypage

I believe that it is a USB unit, so it would use the default usbhid-ups driver.

Try running "usbconfig dump_device_desc" to see if the device shows up. Note that in rare circumstance, it is possible that you will have to reboot after you attach the usb cable.

You can find a lot of useful debug information in the NUT package thread here

JSmorada

It shows up now! Here's the section of the dump:

ugen0.2: <back-ups ns="" 900m="" fw932.a4="" .d="" usb="" fwa4="" american="" power="" conversion="">at usbus0, cfg=0 md=HOST spd=FULL (12Mbps) pwr=ON (2mA)

bLength = 0x0012
bDescriptorType = 0x0001
bcdUSB = 0x0200
bDeviceClass = 0x0000 <probed by="" interface="" class="">bDeviceSubClass = 0x0000
bDeviceProtocol = 0x0000
bMaxPacketSize0 = 0x0040
idVendor = 0x051d
idProduct = 0x0002
bcdDevice = 0x0090
iManufacturer = 0x0001 <american power="" conversion="">iProduct = 0x0002 <back-ups ns="" 900m="" fw:932.a4="" .d="" usb="" fw:a4="">iSerialNumber = 0x0003 <4B1647P27964 >
bNumConfigurations = 0x0001

Now, when there's a power failure what can I expect to happen? I'm familiar with APC's PowerChute for Windows but it doesn't appear there are any options here I can configure…</back-ups></american></probed></back-ups>

dennypage

@nipstech:

Now, when there's a power failure what can I expect to happen?

When the UPS reaches a low battery state, the UPS will signal NUT and NUT will initiate a shutdown.

Given the time required to shutdown a Synology, you may wish to adjust the percentage or time used to determine that the battery is low. You can do this by configuring the UPS itself, or configuring NUT (recommended). See the doc for ups.conf for details on configuring NUT.

I use the following for the system supporting my Synology:


        ignorelb
        override.battery.charge.low = 20
        override.battery.runtime.low = 300

Hope this helps.