Date: Sat, 24 Oct 2020 09:33:04 -0600
Subject: Re: [sloan-25mlog 5217] Re: 2.5m obslog 20201023 (SJD 59146)
From: "Daniel Oravetz"
>> - We had an issue getting the telescope to latch to the cartridges, see
>> cart 2
>> in the night log for details. It persisted for the rest of the night.
> This is not a problem, this is unfamiliarity with the system's
> function.  If it doesn't latch, just push up a bit more and try again,
> repeat as needed.   Even in this state a cart change should take just a
> few seconds longer.  As I said in the email to observers about the lack
> of display, it should be a simple fix - what I didn't explain is that it
> involves power cycling the PLC which is a bit risky for late Friday
> afternoon.
The status LEDs at the top of the Instrument Latch Control Panel can also
be helpful in these instances. E.g., there's a "Cartridge In Place" LED
that lights up an amber color when the cartridge is in position to grant
permission for the latches to actuate. And there's another LED that tells
you when the lift has the weight of the cartridge (I can't remember
exactly the details of that one without looking at it). In any case, they
can help take out some of the guesswork when the lift display isn't
working.