SMT1500RMI2U output short on selftest or power trip

[thomastan]

Hello,

I have a UPS which is nearly 1 year old, and 1 month ago it started having issue when the self test runs or when I pull the plug.

The UPS will vibrate with loud noise for around 5 secs before cutting the output. It will log that the output has a short and the battery will drop to 60+ %.

When I reduce the load (by not turning on some equip) it does not have this issue.

I have a video, but unable to upload it here.

I have replaced the unit with RMA and the problem is still there.

Is it due to over load of the UPS capacity?

Thanks

[Teken]

Based on what you stated up above one of the connected loads is shorted. Start off by removing all connected equipment. Plug in one load at a time until the system faults.

You may upload the video to YouTube and then provide the link here for review. 👍

[thomastan]

I have actually asked the electrician to check and there is no short. This only happens when there is a self test or when I pull the plug to the UPS. I will check how to upload to youtube as I do not have youtube account