Welcome to the new Schneider Electric Community

It's your place to connect with experts and peers, get continuous support, and share knowledge.

Close
Important Announcement: WELCOME to the Schneider Electric Community! We have moved to a new address: community.se.com — bookmark it today and contact SchneiderCommunity.Support@se.com if you have any questions!
Invite a Co-worker
Send a co-worker an invite to the Exchange portal.Just enter their email address and we’ll connect them to register. After joining, they will belong to the same company.
Send Invite Cancel
82697members
350420posts

Is a <1 second chirp/buzz every 5 seconds normal?

APC UPS for Home and Office Forum

Schneider Electric support forum for our APC offers including Home Office UPS, Surge Protectors, UTS, software and services and associated products designed to share knowledge, installation, and configuration.

Solved
Ogham_apc
Crewman
Crewman
0 Likes
10
358

Is a <1 second chirp/buzz every 5 seconds normal?

This was originally posted on APC forums on 4/14/2011


Hi,

Can anyone tell me if it is normal for a Back-UPS (Model BR550GI) to making a short (<1 Second) chirping/buzzing sound at a regular (approx. 5 second) interval whilst powered on and fully charged (no load)?

The buzz is relatively quiet - but noticeably louder than the very quiet constant humming/buzzing that the unit makes.

Any information/guidance would be greatly appreciated!

Thanks,

Ogham

Message was edited by: Ogham


Accepted Solutions
BillP
Administrator Administrator
Administrator
0 Likes
0
358

Re: Is a <1 second buzz every 5 seconds normal?

This reply was originally posted by Kevin Mychal on APC forums on 2/10/2012


So this is normal?

See Answer In Context

10 Replies 10
sunnyville_apc
Crewman
Crewman
0 Likes
0
358

Re: Is a <1 second buzz every 5 seconds normal?

This was originally posted on APC forums on 4/15/2011


Yes I do imagine that the electronics are nearly identical - it can proide a different wattage though.

sunnyville_apc
Crewman
Crewman
0 Likes
0
358

Re: Is a <1 second buzz every 5 seconds normal?

This was originally posted on APC forums on 4/15/2011


Hi, just to clarify, I have a BR1500GI not a 550, so slightly different model. However the buzzing is exactly as you describe it, roughly 5-6 seconds apart, the timing stays the same. It is slightly audible over the standard buzzing sound the unit makes.

BillP
Administrator Administrator
Administrator
0 Likes
0
358

Re: Is a <1 second buzz every 5 seconds normal?

This reply was originally posted by Angela on APC forums on 4/14/2011


did this just start or develop over time? generally, if you have to ask if a sound is normal, its not. maybe its a vibration?

Ogham_apc
Crewman
Crewman
0 Likes
0
358

Re: Is a <1 second buzz every 5 seconds normal?

This was originally posted on APC forums on 4/15/2011


I just wanted to add a few details:

When the unit is powered off (but still being supplied by the wall outlet) there is no sound whatsoever.

When the unit is initially powered on and it does a ~10 second self test the buzzing (for those ~10 seconds) is much louder than both the 5 second interval chirp/buzz and the constant background hum.

Ogham_apc
Crewman
Crewman
0 Likes
0
358

Re: Is a <1 second buzz every 5 seconds normal?

This was originally posted on APC forums on 4/14/2011


Hi,

It is a brand new UPS, I would expect a constant humming - but the slightly louder buzz every 5 seconds seems a bit odd to me.

If it is a vibration, it is definitely not from an external source. I've got the unit in a silent room with everything turned off at the moment.

Ogham

Message was edited by: Ogham

Ogham_apc
Crewman
Crewman
0 Likes
0
357

Re: Is a <1 second buzz every 5 seconds normal?

This was originally posted on APC forums on 4/14/2011


Do you mean a vibration caused by the transformer?

I found a post which described similar symptoms, and possibly the cause (last post - Phil_D):

[http://forums.apc.com/spaces/4/back-ups-surge-protectors/forums/general/4114/rs800-every-3-seconds-c...]

Quote : "Once the battery is fully charge it will be quieter, just making a little chirpy buzz once every couple of seconds you can hear if you put your ear near it. When it switches to battery, for a self test or power outage, then goes back online, the buzzing will increase as the battery is topped up again.

It is simply the intelligent charging circuitry regulating the voltage and current to recharge the battery, and it is using a switch mode power supply and some form of Pulse Width Modulation to control voltage which makes it sound different to usual mains hum we are familiar with from transformers."

Could this be what I am experiencing?

sunnyville_apc
Crewman
Crewman
0 Likes
0
357

Re: Is a <1 second buzz every 5 seconds normal?

This was originally posted on APC forums on 4/15/2011


Just thought I'd add my 2 cents - I have a BR1500GI - it does the same buzzing thing while on and plugged into the mains power (fully charged) - It is barely audible though unless every other device in the room is switched off.

Ogham_apc
Crewman
Crewman
0 Likes
0
357

Re: Is a <1 second buzz every 5 seconds normal?

This was originally posted on APC forums on 4/15/2011


sunnyville,

Thanks very much for letting me know that!

Just to confirm, you have the same approx. 5 second interval buzz/chirp (on top of the background hum) ?

Mine is pretty quiet also (a lot quieter than the buzz that kicks in when the UPS self tests), It stands out because all of the kit in this room is pretty silent anyway.

I've been getting quite worried about this, if you have the same thing happening and your BR550GI is functioning normally - I am much less inclined to worry and can probably treat this as normal for this unit!

Cheers, Ogham

Ogham_apc
Crewman
Crewman
0 Likes
0
357

Re: Is a <1 second buzz every 5 seconds normal?

This was originally posted on APC forums on 4/15/2011


Ah, I guess the electronics are identical - I imagine it has just got a larger battery..

Thanks for clarifying sunnyville! 🙂

BillP
Administrator Administrator
Administrator
0 Likes
0
359

Re: Is a <1 second buzz every 5 seconds normal?

This reply was originally posted by Kevin Mychal on APC forums on 2/10/2012


So this is normal?