Smart-UPS 3000 RM DL3 output voltage drops to ~110V randomly

Anonymous user · ‎2021-06-28

Hi,

My Smart-UPS 3000 RM DL3 gets ~125V from the mains but at times outputs ~110V (usually it matches the mains @~125V) as reported from the USB port.

Other APC UPSes I have do not behave this way.

I've replaces the batteries.

Anybody have any idea why this is happening? Also where is the latest firmware for this unit?

Thanks.

Anonymous user · ‎2021-06-28

In APC's higher end UPS products, there is a voltage regulation transformer that can compensate for low or high line voltage. Usually the UPS will indicate that it is doing this via an LED. Newer models will display a message on the front panel LCD.

You can adjust the threshold at which this takes place, for both high and low voltages. (Older UPSes with LED displays can have the thresholds adjusted via a network management card, by sending commands to the UPS directly, or possibly from whatever UPS management software you may be using. Newer models can be adjusted directly from the menu system that is accessed with the front panel buttons and LCD...or from the network management card if you have one.)

You may find that your line voltage never reaches the threshold value. For some reason, this setting seems to be more of a suggestion than a hard line. I have high line voltage here, and had to bump up a few of my own Smart UPS units to 130 volts or so even though the line voltage as reported by the unit never got above 128 volts AC or so. I'm sure there is some unit-to-unit variation, especially after a few years.

Firmware upgrade information for those UPSes that support it is here : http://www.apc.com/us/en/faqs/content/?id=FA281865 (Link goes to APC's United States site.)

See Answer In Context

Anonymous user · ‎2021-06-28

In APC's higher end UPS products, there is a voltage regulation transformer that can compensate for low or high line voltage. Usually the UPS will indicate that it is doing this via an LED. Newer models will display a message on the front panel LCD.

You can adjust the threshold at which this takes place, for both high and low voltages. (Older UPSes with LED displays can have the thresholds adjusted via a network management card, by sending commands to the UPS directly, or possibly from whatever UPS management software you may be using. Newer models can be adjusted directly from the menu system that is accessed with the front panel buttons and LCD...or from the network management card if you have one.)

You may find that your line voltage never reaches the threshold value. For some reason, this setting seems to be more of a suggestion than a hard line. I have high line voltage here, and had to bump up a few of my own Smart UPS units to 130 volts or so even though the line voltage as reported by the unit never got above 128 volts AC or so. I'm sure there is some unit-to-unit variation, especially after a few years.

Firmware upgrade information for those UPSes that support it is here : http://www.apc.com/us/en/faqs/content/?id=FA281865 (Link goes to APC's United States site.)