New Smart-UPS 3000 overload light with nothing plugged in.

[Anonymous user]

I just purchased two new Smart-UPS 3000 rack mount units and when I plug them in and turn them on I get a steady beep and the overload light with nothing plugged in? I have someone coming to check the power but it should be 120V that is what my old Smart-UPS 2200 used and that is what the new UPS is supposed to use as well or am I wrong?

[Anonymous user]

I'm stuck with a similar problem here: Same battery pack in either one of two SU3000RMNET's results in power up to fan running with no LEDs lit. Pressing on button and releasing during beep results in power up sequence that starts with flashing ONLINE led and ends with solid red OVERLOAD led (with no loads attached).

The standby UPS was disconnected from mains and loads during this week's power "event". The primary SU3000RMNET UPS has been running 24/7 with 1-year old RBC-17 battery pack and went insane after a power outage this week. There were two extended periods with no mains. On the second outage, the UPS batteries were exhausted and the UPS shutdown. When power was restored, the UPS started cycling the loads (computers and HT amplifier) on/off/on/off... bad smell came from UPS (I'll guess the FETs were overloading with surge currents...). Batteries were re-charged using an automotive chargers - they seem to be O.K. Actually they work fine in an old Smart UPS 1250 (two batteries at a time). What does the overload-with-no-load LED mean? How could both UPS be doing same thing and yet batteries seem to be good?

-Thx

[BillP · Accepted solution]

can you check the exact model numbers on the little white sticker on the back of the UPSs?

it should be either SUA3000RMT2U or SUA3000RM2U, or SUA3000RMXL3U. you may see a model starting with SURT, such as SURT3000XLT (208 volt) or SURTA3000XL (120v).

the T in the SUA3000RMT2U version indicates 208 volts. the other two models are 120v. 3000VA models are available in 208v OR 120v. 2200 models are only available in 120v.

a 208v plug shouldnt fit into a 120v receptacle.

please verify the model numbers and we can go from there. thanks.