RS1500 LCD UPS Makes High Pitched Noise - Beep?

[Anonymous user]

Hi everyone,

I just recently purchased the LCD version of the APC RS1500 UPS. I can tell you already, from reading the forums, I may not have followed proper procedure when first hooking the thing up and using it. I basically just plugged the thing in, turned it on, and started plugging things into it.

Now I notice a faint, yet high-pitched, ear-piercing sound coming from the machine about every 5 seconds. I have done some research and some info is leading to replacing the batteries, others are saying there could be transformers or coils etc. vibrating causing the sound. I just wanted to check with the experts to see what they have to say. I don't see any 'replace batteries' light flashing or anything, they read full charge. Not sure where to go from here, any help is always appreciated.

Thanks!

[BillP · Accepted solution]

Hello.

Just wanted to be sure that you have connected the internal battery of the unit, to be sure let us re-seat the battery.  Follow the steps outlined below:

1: Disconnect any attached load.

2: Unplug the UPS from the wall socket.

3: Disconnect the UPS' internal battery.

4: Push and hold the ""On"" button on the UPS for 5 seconds

5: Reconnect internal battery.

6: Plug UPS in to known good power source.

7: Turn UPS on.

Let me know as well what is the model number of your UPS to assist you further.