transfer speed su3000rmnet

[Anonymous user]

I have a su3000rmnet connected to a hp dl585 g5 server.  When we have a power shut down, either manually or from the grid, the server reboots.  The batteries in the 3000 are 1 year old and appear to be in good shape.  When on battery power the ups supplied power to my vacuum for 15 minutes.  Any ideas on how to find out what is wrong?  It appears the transfer speed is too slow.  Thanks, Mark

[BillP]

Hi Mark,

Do you have any test equipment, such as an oscilloscope, to take a look at the UPS output when the power is cut to determine the length of time that the power is dropped or otherwise affected?

Short of that, can you try connecting another computer to the UPS's output and see if it reboots like the HP server does?  The point of trying a different computer is that the "hold time" (the time that the power supply can retain or hold its output with the power removed) of the HP server's power supply may be compromised due to aging capacitors, etc.  It's this "hold time" specification that allows the computer to keep running during very short (milliseconds) duration power glitches.  If another computer exhibits the same reboot characteristics, then the UPS itself is more likely the suspect.

Other than that I'm not sure what the transfer speed of the SU3000rmnet is.  One last question, was the UPS previously capable of keeping the HP running or is this a new quirk with your system?

Best of luck,

Joe

[BillP]

Hi,

The transfer sensitivity is 2 - 4 Milliseconds at high. 6 - 8 at medium and 8 - 10 at low. If your server has power factor corrected power supply the UPS sensitivity should be set to high. You can adjust the sensitivity using an NMC, PowerChute Business Edition, or using the switch on the back of the unit. Kbase FA156514 explains sensitivity. 

[Anonymous user]

Thanks very much for this info. 

I researched the server's power supply and internal battery info and will give that info to my computer tech.  There may be some indicators on the components inside the server which might help....

I set the sensitivity to high using the button on the back so it glows the brightest.  I put the server into bios and connected my laptop without a battery to the ups.  When I cut the power, the ups switched to battery and neither the server of the laptop rebooted.  I will test again with the server operating.

More questions:  I was able to connect powerchute plus (xp) between the computer and the ups via a serial cord.  I have the following info:  123v output, load 34%(when server is running), temp 122 degrees F, runtime calibration lasted for 5 minutes.  The batteries are 1 year old, not APC.  The room temp is 80 degrees F.   My research indicates that the batteries my be hot, but the graphical screen in the powerchute software does not indicate a problem.  Am I ready to cut the power with the server running to see if all is ok?  Is the battery temp ok?  I noticed that the fan came on the apc and the battery temp went down when performing the runtime calibration.  Thanks, Mark

[BillP · Accepted solution]

Regarding the temperature, I am not sure if the sensor measures actual battery temp or simply a temp somewhere inside the UPS.  I have a similar vintage UPS, although not the same model, and the internal temp runs at about 98 degrees F in a 75 degree F ambient environment with the fan off.  As with yours, my temp falls when the fan is running due to a run time cal or an actual power fail.

Personally, if it were my unit I'd be concerned if the internal temp is at 122 degrees F all the time.  That would contribute to early battery failure as well as shortened life of the electronics package.