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paulm(at)olypen.com
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 Posted: Wed Aug 23, 2006 9:46 am Post subject: Contactbounce PIX |
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I have attached up some scope pictures of contact bounce as well as one of a
main bus transient from the removal of a load by turning off a resistive 10
amp load.
In all cases the horizontal speed is 1 ms per small square and 2 ms per
large square. The vertical resolution is 5V per large square. Only small
squares are clear in the transient jpg.
All PIX have been greatly reduced in resolution for fast downloading.
The contact bounce pix were from the contactor sold by Wicks at the time for
cont duty and I added the diode across the coil. There was only enough
voltage and current used to show the contact open and close and to eliminate
the normal arcing as much as possible when a significant load was switched.
My first point is I have seen transients that are repeatable but not high
voltage on the bus. High enough to consistently trip Bobs OVP from the
design of several years ago. The load was switched off with a 20 amp rated
auto relay.
The contact bounce on power contactors can be significant but range widely
from one test to the next with the same contactor. The Kilovac has no or at
most one quick contact bounce on open and none on closing.
Here the opening bounce extends over 14MS from start to end.
Replacing the diode with a transorb helped shorten the bounce duration but
did not eliminate all the bounce.
For general interest. There are lots more but I see no point in posting them
as relays vary and some bounce more than others. The "fire" across the
contacts can in some cases be huge whan large currents and or an inductive
load is switched.
Paul
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