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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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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. |
#2
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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. : |
#3
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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. |
#4
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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. |
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