Need help selecting an inverter [RE-wrenches]
Christopher Freitas - OutBack Power
cfreitas at outbackpower.com
Tue Oct 28 11:52:57 PST 2003
Darryl Thayer wrote:
> Does anyone know how long a contactor
> can be with out power before it drops out?
Most AC coil contactors will open in less than 1 cycle of AC power loss
- under 16 milliseconds. Some will open even if the voltage mearly sags
to less than 80 VAC or so. This usually results in chatter of the
contactor when the occurs - because the pump load is dropped when the
voltage sags and the contactor opens - which then lets the inverter
voltage rise - which then closes the contactor and powers the pump -
which then cause the voltage to drop again - which then opens the
contactor ...
You'll usually know when this happens from my experience (its a pretty
ugly sound - especially when it was followed by the sounds of 52 MOSFETs
blowing up in the SW inverter...).
Christopher Freitas
OutBack Power Systems, Inc.
cfreitas at outbackpower.com www.outbackpower.com
Tel 360 435 6030 Arlington WA USA
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