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APC Symmetra PX160 short-time load drop

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BillP
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Posted: ‎2021-07-12 12:45 AM

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Posted: ‎2021-07-12 12:45 AM

APC Symmetra PX160 short-time load drop

This question was originally posted by Nick on APC forums on 3/4/2019


 

Hi, All.

There is one small (up 70kW of IT Load) DC with two independent utility source followed by ATys m ATS and Symmetra PX160 UPS for protect critical load.  

Some weeks ago, all IT load was dropped by Symmetra for 5-10 seconds.
This incident coinced with some issues at 10kV side and loss of Source 1 (for 2-3 hrs).
Some anomalies also expirienced on Source 2 at the same time (input power troubles were recovered in CRACS control unit logs), but no longer than 20-30 second and therefore wasn't registered by DataCenter Expert monitoring system (poll period = 1 minutes).

All load (IT under UPS and CRACS without UPS) was on the Source 2 at the time of issues.

So, all critical load was unexpectedly dropped for short time period, but no alarm events there found at Symmetra's PX display as no events in event.txt file downloaded from NMC. Only usual NTP updates..

Symmetra MIM logs shows some alarm messages (quoted below)
Any idea or suggestions? Thanx
 0600D07F EXSG  D Operate Q003 ok                          YY/MM/DD 09:47:14 654
0900A05E IM    A IM oper. mode: Shift to ONLINE           YY/MM/DD 09:47:14 628
0100D13E IM    D TIM has SBS on                           YY/MM/DD 09:47:14 628
0100A12E IM    A TIM has Inverter on                      YY/MM/DD 09:47:14 628
0100D57E IM    D Inverter sync. error                     YY/MM/DD 09:47:12 672
0280D24E PM 08 D Output RMS voltage fail                  YY/MM/DD 09:47:11 984
0280D23E PM 08 D Inverter RMS voltage fail                YY/MM/DD 09:47:11 984
0270D24E PM 07 D Output RMS voltage fail                  YY/MM/DD 09:47:11 931
0270D23E PM 07 D Inverter RMS voltage fail                YY/MM/DD 09:47:11 931
0260D24E PM 06 D Output RMS voltage fail                  YY/MM/DD 09:47:11 877
0260D23E PM 06 D Inverter RMS voltage fail                YY/MM/DD 09:47:11 877
0250D24E PM 05 D Output RMS voltage fail                  YY/MM/DD 09:47:11 825
0250D23E PM 05 D Inverter RMS voltage fail                YY/MM/DD 09:47:11 825
0240D24E PM 04 D Output RMS voltage fail                  YY/MM/DD 09:47:11 772
0240D23E PM 04 D Inverter RMS voltage fail                YY/MM/DD 09:47:11 772
0500A32E SBS   A Backfeed Contactor closed                YY/MM/DD 09:47:11 704
02A0D24E PM 10 D Output RMS voltage fail                  YY/MM/DD 09:47:11 672
02A0D23E PM 10 D Inverter RMS voltage fail                YY/MM/DD 09:47:11 672
0100D04E IM    D Output voltage error                     YY/MM/DD 09:47:11 624
0290D24E PM 09 D Output RMS voltage fail                  YY/MM/DD 09:47:11 619
0290D23E PM 09 D Inverter RMS voltage fail                YY/MM/DD 09:47:11 619
0100D02E IM    D Bypass voltage error                     YY/MM/DD 09:47:09 668
0240A24E PM 04 A Output RMS voltage fail                  YY/MM/DD 09:47:09 420
0240A23E PM 04 A Inverter RMS voltage fail                YY/MM/DD 09:47:09 420
0500D32E SBS   D Backfeed Contactor closed                YY/MM/DD 09:47:09 352
02A0A24E PM 10 A Output RMS voltage fail                  YY/MM/DD 09:47:09 315
02A0A23E PM 10 A Inverter RMS voltage fail                YY/MM/DD 09:47:09 315
0290A24E PM 09 A Output RMS voltage fail                  YY/MM/DD 09:47:09 263
0290A23E PM 09 A Inverter RMS voltage fail                YY/MM/DD 09:47:09 263
0280A24E PM 08 A Output RMS voltage fail                  YY/MM/DD 09:47:09 210
0280A23E PM 08 A Inverter RMS voltage fail                YY/MM/DD 09:47:09 210
0270A24E PM 07 A Output RMS voltage fail                  YY/MM/DD 09:47:09 158
0270A23E PM 07 A Inverter RMS voltage fail                YY/MM/DD 09:47:09 158
0260A24E PM 06 A Output RMS voltage fail                  YY/MM/DD 09:47:09 105
0260A23E PM 06 A Inverter RMS voltage fail                YY/MM/DD 09:47:09 105
0250A24E PM 05 A Output RMS voltage fail                  YY/MM/DD 09:47:09 053
0250A23E PM 05 A Inverter RMS voltage fail                YY/MM/DD 09:47:09 053
0600A07F EXSG  A Operate Q003 ok                          YY/MM/DD 09:47:08 966
0900A07E IM    A IM oper. mode: Shift to TEMP BYPASS      YY/MM/DD 09:47:08 924
0100A13E IM    A TIM has SBS on                           YY/MM/DD 09:47:08 924
0100D12E IM    D TIM has Inverter off                     YY/MM/DD 09:47:08 924
0100A57E IM    A Inverter sync. error                     YY/MM/DD 09:47:08 510



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BillP
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Posted: ‎2021-07-12 12:45 AM

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Posted: ‎2021-07-12 12:45 AM

This reply was originally posted by Bill on APC forums on 3/5/2019


Hi,

Sorry for the inconvenience. I have asked that someone from regional 3 phase support team contact you concerning this matter.

See Answer In Context

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BillP
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Posted: ‎2021-07-12 12:45 AM

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Posted: ‎2021-07-12 12:45 AM

This reply was originally posted by Bill on APC forums on 3/5/2019


Hi,

Sorry for the inconvenience. I have asked that someone from regional 3 phase support team contact you concerning this matter.

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