"yyy378" wrote in message
...


On 27/01/2015 14:26, mike wrote:
On 1/26/2015 11:35 PM, wrote:
On Tue, 27 Jan 2015 09:12:43 +0630, yyy378
wrote:

How to minimize voltage drop caused by heavy machine?

We have a typical office environment including computers, scanners,
lights, etc. However, we also have a 14" saw. When it starts, the
voltage drops for a split of a second. This has no immediate effect
except on the scanner. Even though the scanner is plugged into an
uninterrupted power supply, if the saw starts and the scanner is in the
middle of scanning, the scanner will stop and scanning is aborted. When
the saw starts, the uninterrupted power supply produces a click sound.
It seems the protection mechanism is kicked in. Why are the computers
not affected but only the scanner?

The saw starts roughly every two minutes. This renders the scanner
useless. Is there a device I can add to the saw to minimize the voltage
drop? Thanks in advance for all the help.

If it is that important to you,. buy a ferro resonant power
conditioner for the scanner.

You might also be able to go inside the scanner and put some big
capacitors on the DC power supply.

I don't understand this at all.
The purpose of a UPS is to prevent that from happening.
You need a better ups...or maybe the batteries are just weak
and not really doing their thing.

Maybe you can put the scanner and the saw on different circuits?
Depending on the wiring of the building that may or may not help.

Having your ups restart every two minutes sounds like "asking for
trouble!"

I don't understand it either. A computer, monitor, and the scanner are
plugged into the same power strip which, in turn, is plugged into a UPS. I
don't know why the computer is not affected. Perhaps it has something to
do with the power supply of the computer.

I'll try piggybacking one UPS to another to see if that helps.

Another thought, assuming the UPS unit or units are working properly, is to
cut the power to the UPS while the scanner operates, let the UPS carry the
load for a few seconds, and switch the power back on when the scanner is
done. That way the saw, whatever it's doing, can't affect anything on the
plug strip.

TK



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