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Frequency output on SURT10000RMXLI

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.

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vvv850_apc
Crewman
Crewman
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140

Frequency output on SURT10000RMXLI

This was originally posted on APC forums on 8/2/2013


Hello,

I am trying to better understand the reason for having the option to select between +/- 0.1 and +/- 3 Hz for output frequency.

Currently our UPS is set to auto and is powering our server Rack. The nominal frequency in our country is 50Hz. We also have a backup generator which has an output frequency between 52Hz and 50Hz depending on the load.

Everything works well even on the genset but I wanted to know what are the implications of setting the output frequency to 50 +/- 0.1 or 50 +/- 3 from auto. Why would anyone want +/- 3 Hz output?

Regards.


Accepted Solutions
BillP
Administrator Administrator
Administrator
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0
140

Re: Frequency output on SURT10000RMXLI

This reply was originally posted by Angela on APC forums on 8/2/2013


Did some more checking.

This option would also give you a broader range of when bypass operation would be available. If the frequency is "out of range" for bypass functionality and the UPS needs to go to bypass due to a fault or overload, it will drop the load.

See Answer In Context

3 Replies 3
BillP
Administrator Administrator
Administrator
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0
140

Re: Frequency output on SURT10000RMXLI

This reply was originally posted by Angela on APC forums on 8/2/2013


I think it just really depends on the install environment and load attached as far as how narrow or wide a user wants to allow their output frequency to fluctuate.

vvv850_apc
Crewman
Crewman
0 Likes
0
140

Re: Frequency output on SURT10000RMXLI

This was originally posted on APC forums on 8/2/2013


Ok, but why let the user decide the range of the output frequency if it is better to have a narrow fluctuation of +/- 0.1Hz than a wider +/- 3Hz frequency without any other considerations.

The reason I am asking is that I believe that there must be something to take into account if for example you have an output setting of +/- 0.1 Hz and suddenly your input goes above reaching 52Hz as when using a generator without too much load. Then the UPS should continue outputting 50 +/- 0.1 Hz but maybe? not be in online mode anymore thus not conditioning the output voltage.

BillP
Administrator Administrator
Administrator
0 Likes
0
141

Re: Frequency output on SURT10000RMXLI

This reply was originally posted by Angela on APC forums on 8/2/2013


Did some more checking.

This option would also give you a broader range of when bypass operation would be available. If the frequency is "out of range" for bypass functionality and the UPS needs to go to bypass due to a fault or overload, it will drop the load.