Hi Bob,
We have had similar problems but those dropouts were fractions of seconds. Our power company installed recording meters for a while and found that the dropouts we experienced had to do switching capacitor banks by the power company to correct the power factor.
Our equipment was extremely sensitive to power drops and we were able to change the sensitivity to eliminate the problem of equipment stopping or powering down. 

The voltage drops you mention may not be caused by something happening in your building, it could be originating in the neighborhood. Or even when the power company switches sources. A recording voltmeter or triggerable digital oscilloscope may be needed to catch and show the problem.

Good luck,

Ahne.


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Bob Wettermann
Sent: Friday, June 5, 2015 7:08 AM
To: [log in to unmask]
Subject: [TN] Protecting Pick and Place, Ovens, Printers and AOI Systems

All:


In our geographic region we have continued problems with electrical voltage "drop outs". Power will inadvertently and in an unplanned fashion dip (not related to other loads in the factory coming on board) and then recover in less than a few seconds.

We have tried power monitoring equipment to try and "catch" these low voltage swings to see when an event happened but with no success as the frequency of occurrence is small and the period between them can be months.

That being said we have lost several boards on different equipment including controller boards on our PnP equipment and fans on ovens. Our sneaking suspicion is that it is somehow linked to drop in voltage (messing up the print, errors on machines, etc).

Has anyone experienced similar voltage surges or dips? What types of protection strategies or equipment have you found to be worthwhile in protecting the electronics on the equipment?

Thanks

--
Bob Wettermann


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