Maplin/Trust 500 UPS
 

The damn thing has developed the habit of bleeping at random intervals, I
tried running it flat and then reconnecting the mains supply but it still
keeps bleeping.

The user manual doesn't have a trouble shooting table and apart from the
random bleeping, the UPS appears to be working correctly.

Any suggestions?

TIA.

Maplin/Trust 500 UPS
 

ian field wrote:
The damn thing has developed the habit of bleeping at random intervals, I
tried running it flat and then reconnecting the mains supply but it still
keeps bleeping.

The user manual doesn't have a trouble shooting table and apart from the
random bleeping, the UPS appears to be working correctly.

Any suggestions?

Put a switch in series with the noisemaker. I ran a UPS
with this symptom for years with the alarm disconnected.
AFAICT, the UPS always "did the right thing" (in terms
of power) so the noisemaker was just that -- a maker
of noise. :

Maplin/Trust 500 UPS
 

"D Yuniskis" wrote in message
...
ian field wrote:
The damn thing has developed the habit of bleeping at random intervals, I
tried running it flat and then reconnecting the mains supply but it still
keeps bleeping.

The user manual doesn't have a trouble shooting table and apart from the
random bleeping, the UPS appears to be working correctly.

Any suggestions?

Put a switch in series with the noisemaker. I ran a UPS
with this symptom for years with the alarm disconnected.
AFAICT, the UPS always "did the right thing" (in terms
of power) so the noisemaker was just that -- a maker
of noise. :

My best guess would be the battery's internal resistance has started to
increase.

If it does give up, I have a 12V12Ah battery left over from a bigger UPS I
scrapped that used 2 batteries - one was dud and a new UPS from Maplin was
cheaper than replacing the battery.

It won't fit, so it looks like fly-leads through holes drilled in the case -
I can pull the wires off the sounder while I'm at it.

Maplin/Trust 500 UPS
 

Meat Plow wrote in message ...
On Sun, 14 Mar 2010 21:19:00 -0000, "ian field"
wrote:

The damn thing has developed the habit of bleeping at random intervals, I
tried running it flat and then reconnecting the mains supply but it still
keeps bleeping.

The user manual doesn't have a trouble shooting table and apart from the
random bleeping, the UPS appears to be working correctly.

Any suggestions?

TIA.


Check the voltage input. Perhaps it drops lower than the switchover
threshold.

I have 2 identical UPS boxes on the same ring main - only 1 is playing up.