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SMT750I - "Output Off by: Software"

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
peterpavlik_apc
Crewman
Crewman
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2
871

SMT750I - "Output Off by: Software"

This was originally posted on APC forums on 8/29/2020


Hello, I have replaced batteries in APC Smart-UPS 750 and experience a strange problem related to output.

After some time online UPS disables output by itself and refuses to enable it again. After manual power-on it beeps, output is enabled for 2 seconds (green led on) and then the light and power output is disabled with message: "Output Off by: software".

There is nothing connected to UPS via USB cable, batteries are charged to 100% (26.8V), UPS powered by line (243-246V). Can't figure out which "software" is constantly turning my UPS output off (UPS firmware is 09.4 ID 18, no card & no USB cable installed).

The only solution working is the UPS brain-dead procedure. Then the output can be enabled again and works usually up to 12 hours before it's disabled by UPS again. During the time online self-tests pass without errors, no false switching to Battery, all works normally. Only issue i can see is that the green eco-mode is never activated. New Panasonic LC-R127R2PG1 batteries have been charged to 100% in the UPS about 3 times.

Can anyone please explain to me what can be the problem reason? Thanks a lot


Accepted Solutions
peterpavlik_apc
Crewman
Crewman
0 Likes
0
871

Re: SMT750I - "Output Off by: Software"

This was originally posted on APC forums on 9/2/2020


Hi,

No, no card installed in the slot and no cable connected. That's why the message is strange.

I have decided to try to replace batteries with other model. Maybe the temps were too high (35+ Celsius) and UPS decided to the disable power output.

See Answer In Context

2 Replies 2
BillP
Administrator Administrator
Administrator
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871

Re: SMT750I - "Output Off by: Software"

This reply was originally posted by Bill on APC forums on 9/1/2020


Hi,

Is there a network card installed in the UPS, or, is the serial cable attached? The serial cable is RJ50 on the UPS end and 9 pin serial on the PC side. Either the network card or software communicating over serial could be the issue. 

peterpavlik_apc
Crewman
Crewman
0 Likes
0
872

Re: SMT750I - "Output Off by: Software"

This was originally posted on APC forums on 9/2/2020


Hi,

No, no card installed in the slot and no cable connected. That's why the message is strange.

I have decided to try to replace batteries with other model. Maybe the temps were too high (35+ Celsius) and UPS decided to the disable power output.