notme wrote:
What is it about laser printers that causes UPS manufacturers to recommend
they not be powered by a "stepped approximation to sine" UPS? It's a SMSP,
isn't it? What makes it special such that it needs sine-only? No such caution
re. computers, etc...


Modified sine is often just full peak on, pause, full negative peak,
pause, and so on. That can mess with PFC circuitry and also stresses
rectifiers at the line input more than a sine. However, RVers and
traveling sales folks do sometimes use modified sine inverters.

What really wreaks havoc is a printer that has a powerful fuser which
draws short but huge bursts of current. That can cause the inverter
inside the UPS to choke.

--
Regards, Joerg

http://www.analogconsultants.com/

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