Ups Reliability Measures
IT-sized uninterruptible power supplies can suffer what is termed ‘dead-on-arrival’. This could be due to a component manufacturing defect or transportation damage.
A sudden shock or jolt in transportation may weaken a soldered joint, for example. Whilst UPS manufacturers strive to reduce these incidents as much as possible through stringent quality checks and testing processes, they do happen. Various processes can be applied to minimise the chances of it happening. UPS from 10kVA, for example, can be run for short burn-in periods (up to 48 hours) at high ambient temperature to reduce the potential for such failures. Random UPS Failures Random failures happen less often. During the normal working life of a UPS, the rate of these is low and fairly constant.
Wear Out Failures Wear out failures at the end of an uninterruptible power supply’s working life are more common (and this is where the curves is steeper). Here, battery problems account for 98 percent of UPS wear out failures. Particularly where uninterruptible power supply has been subjected to high ambient temperatures over long periods, internal cabling insulation becomes brittle and breaks down. There are other consumable items that should be part of a regular monitoring regime, such as fans and capacitors, which will also eventually wear out with use. Just because a manufacturer shows you some favourable MTBF stats does not necessarily mean that their products are the most reliable.
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Pisac monitoring site
20.06.2010
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