Baffled by a UPS

analog_sa · 21st June 2008, 03:11 PM

My new UPS seems really incapable of supplying light loads. It would supply a 200W load for over 30 minutes but lightly loaded or not loaded at all it switches off in exactly 5 min. This seems like some type of a safety feature but for the life of me i can't see the purpose. Is this common? My other, very old UPS, certainly does not behave the same way. Any ideas if it is possible to modify this?

Elvee · 21st June 2008, 05:25 PM

Hi,

There might be a logic to it:
if it senses no load for a period of time, it decides it is not in use, and shuts down in order to save the batteries.
I would imagine this kind of "feature" can be disabled via the console or dip switches (unless it is endorsed by Microsoft, off course).
LV

analog_sa · 21st June 2008, 06:34 PM

Quite likely. A very annoying "feature" which makes it impossible to power up items with low consumption like ADSL modems/routers or laptops. I wonder if this is common with other modern UPSs. If it does indeed sense the output current, there is likely to be a sense resistor in series with the output, right? Sadly, no dip switches, pots or any possibility for adjustments.

21st June 2008, 03:11 PM	#1
analog_sa diyAudio Member Join Date: Aug 2002 Location: Sofia	Baffled by a UPS My new UPS seems really incapable of supplying light loads. It would supply a 200W load for over 30 minutes but lightly loaded or not loaded at all it switches off in exactly 5 min. This seems like some type of a safety feature but for the life of me i can't see the purpose. Is this common? My other, very old UPS, certainly does not behave the same way. Any ideas if it is possible to modify this?

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21st June 2008, 05:25 PM	#2
Elvee diyAudio Member Join Date: Sep 2006	Hi, There might be a logic to it: if it senses no load for a period of time, it decides it is not in use, and shuts down in order to save the batteries. I would imagine this kind of "feature" can be disabled via the console or dip switches (unless it is endorsed by Microsoft, off course). LV

21st June 2008, 06:34 PM	#3
analog_sa diyAudio Member Join Date: Aug 2002 Location: Sofia	Quite likely. A very annoying "feature" which makes it impossible to power up items with low consumption like ADSL modems/routers or laptops. I wonder if this is common with other modern UPSs. If it does indeed sense the output current, there is likely to be a sense resistor in series with the output, right? Sadly, no dip switches, pots or any possibility for adjustments.

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