From: "Pete Newman"
Subject: RE: building interlocks (was RE: 2.5-m ObsLog 20010616 (MJD 52077))
Date: Mon, 18 Jun 2001 11:48:45 -0600
Steph wrote:
> ...got bitten by
> the new building interlocks. We started a telescope slew before the
> building had stopped moving. A phone call to Jon set us on the
> interlocks track. We are not happy that if you trip the building motion
> interlock even when the building is well away from the telescope, you
> have to lower the telescope to 6 degrees to clear the interlock. We are
> also not happy that you have to wait to slew until the building has come
> to a complete stop. It is safe to slew before the building is at its
> full range of travel, and it wastes a couple of minutes. We feel the
> interlock should be position dependent, not motion dependent.
This is an inconsistency between the telescope->building and building->
telescope interlocks.  I should have mentioned this in a recent log, when we
got bitten by the same bug.
When opening the building, the MCP telescope interlocks display shows
'building' as preventing telescope motion until the building is clear of the
telescope but not all the way to its east limit.  This is fine.  However, if
you move the telescope as soon as the 'building' button in the interlocks
display clears, then the building is stopped.
We want the telescope to be free to move if the building is sufficiently
open, as now, AND for the building to be allowed to continue to open, which
is presently prevented.
It is fine to prevent the building from closing if the telescope is not at
stow, of course.
--Pete