Subject: Re: [sloan-25mlog 4804] 2.5m obslog 20191130 (SJD 58818)
From: John Downey
Date: Sun, 1 Dec 2019 12:52:04 -0700
>=20
> The Utility power came back on at 2:03Z. The humidity is marginally ok =
to open,=20
> the temperature was at ~ -6C. The sky was clear with likely bad seeing =
due to=20
> 30 mph wind from East. There is about 1/4 inch layer of ice on the =
south=20
> enclosure. We concerned that the enclosure could get stuck due to the =
ice, so=20
> called JohnD for his advice. After discussion, we agreed that we would =
not open
> because the risk of the enclosure getting stuck.
Came in today to check on the rails, they were clear by the time I got =
here at 11.  =46rom the look of the enclosure on the west landing =
opening would have been impossible at -5 C, it was all coated with about =
1/2" of solid ice.  By noon when Kaike and I were working on it, temp =
was more like +8 C, so it all came off pretty easily.  We moved the =
enclosure off a couple feet to verify that it was free and to finish =
cleaning behind the DIMM and in other hard to reach places.  This all =
probably would have melted on its own by evening, but it is just as well =
that Kaike checked out there as now opening tonight should be a =
certainty.
Moved the heating mats around to melt residual ice and squeegeed off the =
water from melting.
>=20
> Notes:
> =3D=3D=3D=3D=3D=3D
> 1. MIG numbers for B, C, D of M2 are reading zeros. They either get =
into the
> programming mode or the batteries are not good.
This is the B mig going into program mode, which it does spontaneously a =
few times a year.  Since our wire shielding repair didn't cure it, I'm =
going to guess its either the plug or socket at the gauge itself.
Since I was here anyway, I reset the mig (different than hitting that =
button on the box, that resets the multiplexers that the gauge signals =
go to, even though it's labeled "mig reset").  This time it  took a =
power cycle to get the mig to behave, usually it's just a matter of =
hitting it's "mode" button until it reads in mm.