[evlatests] EVLA Hardware

[Tom Frost]

Rob Long wrote:
> 
> Went to investigate why antenna 24 'died' after a power glitch and 
> discovered all four batteries totally dead!  Everything in the AC to DC 
> power system was working correctly, no fuses were blown, and after 
> replacing the batteries, DC power looked fine.  I cycled AC power to the 
> supply with no problems or drops.  I then cycled AC power to the fire 
> alarm system which caused the AC contactor to open and kill all AC power 
> to the antenna.(Is this functioning properly?)  

this is *not* correct...it sounds like a malfunction in the fire
alarm system...the MOS Grp will look at it today...

I think #24 has the new power line monitor installed in the main
AC distribution panel...it could tell us if the power was off for
a couple of hours, but I would think that someone would have noticed
that...

DC power (however)
> stayed stable.  Could AC power have been down on antenna 24 for a couple 
> of hours?  This would have caused the batteries to drain beyond the 
> point where the DC contactor could have closed and allowed the batteries 
> to recharge.  The power seems stable now, so I will keep a close eye on 
> 24 for a few days.
> 
> Rob
> 
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-- 

Tom Frost WA6OML
Technical Specialist II
National Radio Astronomy Observatory
VLA Site--Plains of San Augustin
New Mexico, USA