On Wed, Apr 1, 2009 at 10:54 PM, Lelsie Rhorer lrho...@satx.rr.com wrote:
Gentlemen,
I am running a Tripp Lite OMNISV1500XL under NUT using the
tripplite_usb driver on a Debian Lenny Linux system. The platform is an
AMD Athlon 64 x 2 processor running kernel 2.6.26. The driver is up and
running, but there are several issues.
First, the system drops communications with the UPS regularly -
typically 2 or three times an hour. I've worked around this by running a
script which checks every few seconds to make sure the UPS driver is
on-line, and if not restarts NUT. I do not observe this behavior when I
boot Windows XP Pro 64 on the system.
I believe this has been addressed once before:
http://article.gmane.org/gmane.comp.monitoring.nut.user/4213/match=known
Secondly, the reported voltages are all incorrect. I measured
them with an accurate voltmeter, and the Input Voltage is typically around
120V, the Output Voltage is 122V, and the Battery Voltage at full charge is
26V. Running under Windows, the system confirms these values. Under the
Linux driver, however, the system is reporting an Input Voltage of around
113V, an Output Voltage of 114V, and a fully charged Battery Voltage of
14.6V.
April Fools! We're just doing this to keep you on your toes.
Actually, almost everything in tripplite_usb was determined by
experimentation. You can see the raw data by starting the driver with
an extra -D or two on the command line. (Please don't post the
output to the list - at least, not until we have an answer to #2
below.)
In order to fix the driver, we would need two things:
1) readings from the driver as the battery discharges, and the
corresponding multimeter readings.
2) a way to distinguish your unit from the other units, which appear
to work with the current scale values.
Also, for #1, it would be ideal if you had a way to vary the line voltage.
Finally, to paraphrase Arjen, an UPS is not a measurement device.
--
- Charles Lepple
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