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Posts Tagged ‘UPS’

UPS Repair – Part 3

March 29th, 2012 No comments

New relays have been fitted, the unit reassembled, and powered back up. So far everything looks good, but I won’t know for sure if the problem has really been fixed until I get some under or over voltages, but I’m fairly confident of the repair.

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UPS Repair – Part 2

March 24th, 2012 No comments

I’ve stripped the UPS down and removed the main circuit board. After a quick examination I identified four likely relays and then extracted them for testing.

Relay R406 had a high resistance across a couple of contacts, so this looks to be the AVR relay. One of the other relays (I forget which) also sounded a bit tired when I was testing it.

What I plan to do next is replace all four, since I’ve already gone to the effort of removing them. The original relays are Song Chuan 793-P-1C-3. I’m going to replace them with Omron G2R-1-E 24DC from CPC. I’ll get them ordered up within the next few days, and hopefully have it back together before the end of next week.

 

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UPS Repair – Part 1

March 23rd, 2012 No comments

I’ve a small project that should keep me occupied for a short while. I recently got my hands on an APC Smart-UPS X 1500VA (SMX1500RMI2U) which was heading to the skip. It had been replaced by an identical unit after it had developed a fault. Needless to say it happened not long after the warranty had expired, and it was not considered worth repairing.

The issue with this UPS is an “AVR Relay Weld” fault. Hopefully this should be an easy fix, assuming I can get a replacement relay, once I identify the exact offending component.

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