Re: Continuing the BA356 adventure...

From: Chris Scheers (chris_at_applied-synergy.com)
Date: 05/29/03 

Date: Wed, 28 May 2003 19:52:02 -0500

Stuart Fuller wrote:
> >
> > When I remove a fan, I still have a good Shelf_OK signal.
> >
> > I can test the Shelf_OK by inserting a second power supply (with no
> > power cord attached). The HSZ50 then reports a fan or power supply
> > failure. The failure is cleared when the second power supply is removed
> > (or gets power).
> >
> >
> When you first apply power, you should see the lights flash.
>
> I suspect that the fan is what is actually pulling down the "Shelf_OK"
> signal. Therefore, removing the fan is removing the capability of pulling
> the signal down.
>
> Wonder what would happen if you shoved a stick into one of the fans? I
> just did (actually, the end of a cable tie). In addition to a wonderful
> stream of dust emitting from the fan (and all over my clean white T-shirt)
> and the noise of a cable tie being inserted into a squirrel cage fan, the
> other fan sped up considerably. Since this is on a BA350, there are no
> lights to look at, but I suspect that if I had lights, one of them would be
> on.

You got it!

When I shove a stick into one of the fans, the fault light comes on, I
lose Shelf_OK, and the controller complains.

I still think that removal of a fan should be a fault. I'm a bit
nervous that fault detection requires the failing component to indicate
its own failure.

Thanx!

-----------------------------------------------------------------------
Chris Scheers, Applied Synergy, Inc.

Voice: 817-237-3360 Internet: chris@applied-synergy.com
  Fax: 817-237-3074

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