Nut upsuser - Mar 2013 - unacceptable utility voltage rate of change

Hi,

One of my APC devices reports: "unacceptable utility voltage rate of
change".
I believe it has something to do with input voltage fluctuating too fast maybe
even beneath or over the input voltage thresholds.
Should I worry about this?
should I measure input voltage? (I suppose I'd need more than multimeter
readings. Maybe an oscilloscope or a multimeter that can record statistics? -
I'm no expert in this field...)

battery.alarm.threshold 	: 	0
battery.charge 	: 	100.0
battery.charge.restart 	: 	00
battery.date 	: 	09/02/08
battery.packs 	: 	000
battery.runtime 	: 	960
battery.runtime.low 	: 	120
battery.voltage 	: 	55.05
battery.voltage.nominal 	: 	048
device.mfr 	: 	APC
device.model 	: 	SMART-UPS 5000 RM DL4
device.serial 	: 	AS0836160289
device.type 	: 	ups
driver.name 	: 	apcsmart
driver.parameter.pollinterval 	: 	2
driver.parameter.port 	: 	/dev/UPS-1
driver.version 	: 	2.6.3
driver.version.internal 	: 	3.0
input.frequency 	: 	50.00
input.quality 	: 	FF
input.sensitivity 	: 	H
input.transfer.high 	: 	253
input.transfer.low 	: 	196
input.transfer.reason 	: 	unacceptable utility voltage rate of change
input.voltage 	: 	226.2
input.voltage.maximum 	: 	226.2
input.voltage.minimum 	: 	226.2
output.voltage 	: 	226.2
output.voltage.nominal 	: 	230
ups.delay.shutdown 	: 	020
ups.delay.start 	: 	000
ups.firmware 	: 	112.1DL4.I
ups.id 	: 	UPS_IDEN
ups.load 	: 	039.0
ups.mfr 	: 	APC
ups.mfr.date 	: 	09/02/08
ups.model 	: 	SMART-UPS 5000 RM DL4
ups.serial 	: 	AS0836160289
ups.status 	: 	OL
ups.temperature 	: 	022.5
ups.test.interval 	: 	1209600
ups.test.result 	: 	NO

Thanks,

Vieri

> Hi,
> 
> One of my APC devices reports: "unacceptable utility voltage rate of
change".
> I believe it has something to do with input voltage fluctuating too fast
maybe even beneath or over the input voltage thresholds.
> Should I worry about this?
> should I measure input voltage? (I suppose I'd need more than
multimeter readings. Maybe an oscilloscope or a multimeter that can record
statistics? - I'm no expert in this field...)
A scope wouldnt do it, you couldn't stare for hours, days,
not blink & then memorise the glitches.

There are special machines that log power fluctuations.
I used one maybe in 1977, so theyre not new & can be/ were once simple :-)

With modern micro electronics one could do more logging.
Rather than look for more hardware, as inside of (eg my) APC is
stuff full already, if I were in your shoes, I'd see if maybe APC
might be able to emit a real time output one could log on PC.

Cheers,
Julian
-- 
Julian Stacey, BSD Unix Linux C Sys Eng Consultant, Munich http://berklix.com
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