Normal behaviour after input power error?

[Anonymous user]

Hi all,

we use a RT 3000 XL and some SRT 5000s. Yesterday we had the first input error after the installation. I am confused because of the log messages:

10.12.14  07:55:38  User.Info	usv_a1	172.18.16.51 UPS: An input voltage or frequency problem no longer prevents switching to bypass mode. 0x0210
10.12.14  07:55:37  User.Critical	usv_a1	172.18.16.51 UPS: Bypass not in range ; either frequency or voltage. 0x020F

10.12.14  07:55:37  User.Info	usv_KnX	172.18.18.50 UPS: An input voltage or frequency problem no longer prevents switching to bypass mode. 0x0210
10.12.14  07:55:37  User.Critical	usv_KnX	172.18.18.50 UPS: Bypass not in range ; either frequency or voltage. 0x020F

10.12.14  07:55:37  User.Info	usv_mfcii01	172.18.18.52 UPS: An input voltage or frequency problem no longer prevents switching to bypass mode. 0x0210
10.12.14  07:55:37  User.Critical	usv_mfcii01	172.18.18.52 UPS: Bypass not in range ; either frequency or voltage. 0x020F

Some switches on the campus were restarted but the switches with one power cable to the ups and one to the normal power input did not made a power error message.

What shall I do?

[BillP]

Can you provide the full event.txt, data.txt and config.ini from the UPSs you saw this one? (Instructions here on gathering log files): How can I download Event, Data, Configuration, and Debug files from my Network Management Card? | FA...)

These UPSs typically have an expected voltage range where they could operate in bypass mode. Once they are outside of this mode, you may receive these alarms to tell you that if the UPS has to go to bypass, the voltage or frequency is out of range (and depending on your settings, the UPS output may turn off). The UPS can go to bypass by user command or if there is an overload condition or a fault condition in an effort to keep your equipment online as best it possibly can.

What I expect to see in your logs is if you had a power outage or fluctuation, the voltage and/or frequency may have been jumping all around and while the UPS may have been able to operate online, if something caused it to go to bypass, it may not have been able to. As long as the alarm is not active and you can explain this because of a brief power event, then it is a non-issue.

Let me know if you have any questions.

[Anonymous user]

Hi Angela,

thanks for your support, attached are the files?

I did not command them to bypass mode. All UPSs had the sinus icon on the display. But you will see it in the files.

[Anonymous user]

OK I also checked the Data file.

At 12/10/2014 between 07:55 an 07:58 we had a V drop to 175-189V on our UPSs.

The Switch PSU without UPS had ignored it and the other PSU was provided from the UPS. But why I got bypass messages? If I had a total V drop did I also got this messages?

[BillP · Accepted solution]

The message is not telling you it went into bypass, it is telling you if it had to go to bypass automatically due to one of those reasons I mentioned earlier, it might not have been able to because of the voltage and/or frequency was out of a specified range (which is a configurable item in the Network Management Card.

You'll be able to see this in the web interface too but I see in the config file:

BypassUpperVoltage=265

BypassLowerVoltage=160

So basically, the input voltage likely fell out of this range briefly or you may have had a frequency problem. The Network Management Card has a good blurb in its help file too..

Bypass Upper Voltage	The maximum voltage that the UPS will pass to connected equipment during internal bypass operation.
Bypass Lower Voltage	The minimum voltage that the UPS will pass to connected equipment during internal bypass operation.
Output Frequency Range	The allowable UPS output frequency range. Whenever possible, the output frequency adjusts to match the input frequency whenAuto_50/60 is selected. To define an output frequency that does not match the input frequency, select an output frequency from the drop-down list. Note: Some UPS models only allow this setting to be changed when the output is off.
Bypass Transfer Mode	The Bypass Transfer Mode determines under what conditions a bypass transfer will take place. Some settings may no be available on certain products. Bypass Phase Lock Not Required: Phase lock (and therefore frequency lock) is NOT required for bypass operation. This allows a UPS that is doing frequency conversion (e.g. 50 Hz in, 60 Hz out) to go to bypass operation if all other appropriate condtions for bypass are met. Bypass Phase Lock Required: Phase lock (and therefore frequency lock) is required for bypass operation. This prevents a UPS that is doing frequency conversion (e.g. 50 Hz in, 60 Hz out) from going to bypass under any condtion (e.g. failure or protocol command). Never Acceptable: Transfer to static bypass disabled. Allowed on Mains Fault: Allows transfer to bypass feed when the input mains has failed. This selection is used to allow transfer to bypass when green mode is disabled.

[Anonymous user]

OK that is understandable.

So it was an information because of the V drop.

Thanks a lot.

[BillP]

Yes

No problem!