Quote:
Originally Posted by villagetinker
You are correct, the SURGE devices are specifically for surges 100's of volts microsecond rise times and very short duration. Since it was reported the "lights got bright" I suspect something happened on the utility side to cause a high (overvoltage) condition that lasted several seconds and the devices that failed could not withstand this condition. I do find it interesting that the UPS allowed the connected devices to fail. I would be interested in the brand as I have 2 protecting a multi thousand sew machine and the another for computer equipment.
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There are two types of UPS, online and offline:
The main difference between online and offline UPS systems is that online UPS systems provide power without interruption during an outage, while offline UPS systems experience a break in power:
Online UPS
This system uses a "double conversion" method to convert incoming AC power to DC, which then charges the battery and powers the load. Because the inverter is already supplying power when there's an outage, there's no transfer time.
This system also provides a stable output and isolates the load from mains supply irregularities.
Offline UPS
This system, also known as a standby UPS, charges the batteries continuously and uses the inverter to power the load when there's a power failure.
There's usually a 2–10 millisecond break in power during an outage.
An overvoltage condition could pass through during switch over.
Online UPS systems are a good choice if you can't tolerate even a millisecond of downtime l.
They also offer better protection from surges, lightning, and electromagnetic noise than other UPS systems