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NMC reported Input Voltage Questions

APC UPS Data Center & Enterprise Solutions Forum

Schneider Electric support forum for our Data Center and Business Power UPS, UPS Accessories, Software, Services, and associated commercial products designed to share knowledge, installation, and configuration.

Solved
jaimie_at_featuretel.com_apc
Ensign
Ensign
0 Likes
3
308

NMC reported Input Voltage Questions

This was originally posted on APC forums on 5/20/2010


Hello All,

If someone can answer these questions, I would greatly appreciate it.

What is the relationship between the NMC's reported Input Voltage and the Utility feeds measured voltage? Shouldn't the values be roughly the same, +/- 5%?
What would cause a situation where the NMC's reported Input Voltage would be significantly less than the Utility feeds voltage measured at the plug?
The NMC's Input Voltage decreases as the UPS load increases. Is this normal?

We have an SUA2200XLRM3U +1 SUA48RMXLBP3U, with an AP9617 NMC.

Thanks,

Jaimie


Accepted Solutions
jaimie_at_featuretel.com_apc
Ensign
Ensign
0 Likes
0
308

NMC reported Input Voltage Questions

This was originally posted on APC forums on 5/20/2010


Hello All,

If someone can answer these questions, I would greatly appreciate it.

What is the relationship between the NMC's reported Input Voltage and the Utility feeds measured voltage? Shouldn't the values be roughly the same, +/- 5%?
What would cause a situation where the NMC's reported Input Voltage would be significantly less than the Utility feeds voltage measured at the plug?
The NMC's Input Voltage decreases as the UPS load increases. Is this normal?

We have an SUA2200XLRM3U +1 SUA48RMXLBP3U, with an AP9617 NMC.

Thanks,

Jaimie

See Answer In Context

3 Replies 3
jaimie_at_featuretel.com_apc
Ensign
Ensign
0 Likes
0
308

Re: NMC reported Input Voltage Questions

This was originally posted on APC forums on 5/20/2010


Thanks for the reply.

I've attached the event and data logs. I stripped out System messages related to DNS, User login, e-mail, etc. from the event log to reduce it's size.

The logs go all the way back to the original installation in 2007. The input voltage problem appears to have been around since the beginning, but was never noticed since I've only recently started actively monitoring the UPS vital stats (Input Voltage, Output Voltage, Load, and Battery Capacity) using SNMP queries from an Solarwinds Orion NMS platform.

The UPS was installed as a "last line of defense" unit in a Colo that already provides filtered, UPS+Generator backed up power. The Utility feed for the UPS is a direct bypass feed provided by the colo specifically for this application.

Thanks,

Jaimie

Attachments
BillP
Administrator Administrator
Administrator
0 Likes
0
308

Re: NMC reported Input Voltage Questions

This reply was originally posted by Matt on APC forums on 5/20/2010


The NMC reports the values provided by the CPU in the Smart-UPS. It is possible that the UPS is incorrectly evaluating voltage and reporting it to the NMC.

This can be tested a few different ways:

1) Install PowerChute Business Edition Agent and see what the software reports for these voltages. Like the NMC, the software reports what is provided by the UPS.

2) Try another known-good NMC and view reported voltages.


Also, to answer your other question: Yes, all other things being equal on a given circuit, voltage does decrease as load increases.

jaimie_at_featuretel.com_apc
Ensign
Ensign
0 Likes
0
309

NMC reported Input Voltage Questions

This was originally posted on APC forums on 5/20/2010


Hello All,

If someone can answer these questions, I would greatly appreciate it.

What is the relationship between the NMC's reported Input Voltage and the Utility feeds measured voltage? Shouldn't the values be roughly the same, +/- 5%?
What would cause a situation where the NMC's reported Input Voltage would be significantly less than the Utility feeds voltage measured at the plug?
The NMC's Input Voltage decreases as the UPS load increases. Is this normal?

We have an SUA2200XLRM3U +1 SUA48RMXLBP3U, with an AP9617 NMC.

Thanks,

Jaimie